forked from Speiger/Primitive-Collections
599 lines
19 KiB
Plaintext
599 lines
19 KiB
Plaintext
package speiger.src.collections.PACKAGE.utils;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import speiger.src.collections.PACKAGE.collections.ITERATOR;
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import speiger.src.collections.PACKAGE.lists.ARRAY_LIST;
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import speiger.src.collections.PACKAGE.lists.LIST;
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import speiger.src.collections.PACKAGE.lists.LIST_ITERATOR;
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import speiger.src.collections.PACKAGE.collections.BI_ITERATOR;
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import speiger.src.collections.PACKAGE.collections.COLLECTION;
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/**
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* A Helper class for Iterators
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*/
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public class ITERATORS
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{
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/**
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* Empty Iterator Reference
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*/
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public static final EmptyIterator NO_GENERIC_TYPE EMPTY = new EmptyIteratorBRACES();
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/**
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* Returns a Immutable EmptyIterator instance that is automatically casted.
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* @Type(T)
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* @return an empty iterator
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*/
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public static GENERIC_KEY_BRACES EmptyIterator KEY_GENERIC_TYPE empty() {
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#if TYPE_OBJECT
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return (EmptyIterator<KEY_TYPE>)EMPTY;
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#else
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return EMPTY;
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#endif
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}
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/**
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* Inverter function for Bidirectional Iterators
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* @param it the iterator that should be inverted
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* @Type(T)
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* @return a Inverted Bidirectional Iterator. If it was inverted then it just gives back the original reference
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*/
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public static GENERIC_KEY_BRACES BI_ITERATOR KEY_GENERIC_TYPE invert(BI_ITERATOR KEY_GENERIC_TYPE it) {
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return it instanceof ReverseBiIterator ? ((ReverseBiIterator KEY_GENERIC_TYPE)it).it : new ReverseBiIteratorBRACES(it);
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}
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/**
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* Inverter function for List Iterators
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* @param it the iterator that should be inverted
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* @Type(T)
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* @return a Inverted List Iterator. If it was inverted then it just gives back the original reference
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*/
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public static GENERIC_KEY_BRACES LIST_ITERATOR KEY_GENERIC_TYPE invert(LIST_ITERATOR KEY_GENERIC_TYPE it) {
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return it instanceof ReverseListIterator ? ((ReverseListIterator KEY_GENERIC_TYPE)it).it : new ReverseListIteratorBRACES(it);
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}
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/**
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* Returns a Immutable Iterator instance based on the instance given.
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* @param iterator that should be made immutable/unmodifiable
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* @Type(T)
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* @return a unmodifiable iterator wrapper. If the Iterator already a unmodifiable wrapper then it just returns itself.
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*/
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public static GENERIC_KEY_BRACES ITERATOR KEY_GENERIC_TYPE unmodifiable(ITERATOR KEY_GENERIC_TYPE iterator) {
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return iterator instanceof UnmodifiableIterator ? iterator : new UnmodifiableIteratorBRACES(iterator);
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}
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/**
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* Returns a Immutable Iterator instance based on the instance given.
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* @param iterator that should be made immutable/unmodifiable
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* @Type(T)
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* @return a unmodifiable iterator wrapper. If the Iterator already a unmodifiable wrapper then it just returns itself.
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*/
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public static GENERIC_KEY_BRACES BI_ITERATOR KEY_GENERIC_TYPE unmodifiable(BI_ITERATOR KEY_GENERIC_TYPE iterator) {
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return iterator instanceof UnmodifiableBiIterator ? iterator : new UnmodifiableBiIteratorBRACES(iterator);
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}
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/**
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* Returns a Immutable ListIterator instance based on the instance given.
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* @param iterator that should be made immutable/unmodifiable
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* @Type(T)
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* @return a unmodifiable listiterator wrapper. If the ListIterator already a unmodifiable wrapper then it just returns itself.
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*/
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public static GENERIC_KEY_BRACES LIST_ITERATOR KEY_GENERIC_TYPE unmodifiable(LIST_ITERATOR KEY_GENERIC_TYPE iterator) {
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return iterator instanceof UnmodifiableListIterator ? iterator : new UnmodifiableListIteratorBRACES(iterator);
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}
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/**
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* Helper function to convert a Object Iterator into a Primitive Iterator
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* @param iterator that should be converted to a unboxing iterator
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* @ArrayType(T)
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* @return a primitive iterator
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*/
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public static GENERIC_KEY_BRACES ITERATOR KEY_GENERIC_TYPE wrap(Iterator<? extends CLASS_TYPE> iterator) {
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return iterator instanceof ITERATOR ? (ITERATOR KEY_GENERIC_TYPE)iterator : new IteratorWrapperBRACES(iterator);
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}
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/**
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* Returns a Array Wrapping iterator
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* @param a the array that should be wrapped
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* @ArrayType(T)
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* @return a Iterator that is wrapping a array.
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*/
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public static GENERIC_KEY_BRACES ArrayIterator KEY_GENERIC_TYPE wrap(KEY_TYPE[] a) {
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return wrap(a, 0, a.length);
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}
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/**
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* Returns a Array Wrapping iterator
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* @param a the array that should be wrapped.
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* @param start the index to be started from.
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* @param end the index that should be ended.
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* @ArrayType(T)
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* @return a Iterator that is wrapping a array.
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*/
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public static GENERIC_KEY_BRACES ArrayIterator KEY_GENERIC_TYPE wrap(KEY_TYPE[] a, int start, int end) {
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return new ArrayIteratorBRACES(a, start, end);
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}
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/**
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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*/
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public static GENERIC_KEY_BRACES int unwrap(KEY_TYPE[] a, Iterator<? extends CLASS_TYPE> i) {
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return unwrap(a, i, 0, a.length);
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}
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/**
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @param offset the array offset where the start should be
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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*/
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public static GENERIC_KEY_BRACES int unwrap(KEY_TYPE[] a, Iterator<? extends CLASS_TYPE> i, int offset) {
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return unwrap(a, i, offset, a.length - offset);
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}
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/**
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @param offset the array offset where the start should be
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* @param max the maximum values that should be extracted from the source
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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* @throws IllegalStateException if max is smaller the 0 or if the maximum index is larger then the array
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*/
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public static GENERIC_KEY_BRACES int unwrap(KEY_TYPE[] a, Iterator<? extends CLASS_TYPE> i, int offset, int max) {
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if(max < 0) throw new IllegalStateException("The max size is smaller then 0");
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if(offset + max > a.length) throw new IllegalStateException("largest array index exceeds array size");
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int index = 0;
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for(;index<max && i.hasNext();index++) a[index+offset] = OBJ_TO_KEY(i.next());
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return index;
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}
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/**
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* A Primitive iterator variant of the ITERATORS unwrap function
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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*/
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public static GENERIC_KEY_BRACES int unwrap(KEY_TYPE[] a, ITERATOR KEY_GENERIC_TYPE i) {
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return unwrap(a, i, 0, a.length);
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}
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/**
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* A Primitive iterator variant of the ITERATORS unwrap function
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @param offset the array offset where the start should be
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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*/
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public static GENERIC_KEY_BRACES int unwrap(KEY_TYPE[] a, ITERATOR KEY_GENERIC_TYPE i, int offset) {
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return unwrap(a, i, offset, a.length - offset);
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}
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/**
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* A Primitive iterator variant of the ITERATORS unwrap function
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @param offset the array offset where the start should be
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* @param max the maximum values that should be extracted from the source
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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* @throws IllegalStateException if max is smaller the 0 or if the maximum index is larger then the array
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*/
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public static GENERIC_KEY_BRACES int unwrap(KEY_TYPE[] a, ITERATOR KEY_GENERIC_TYPE i, int offset, int max) {
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if(max < 0) throw new IllegalStateException("The max size is smaller then 0");
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if(offset + max > a.length) throw new IllegalStateException("largest array index exceeds array size");
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int index = 0;
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for(;index<max && i.hasNext();index++) a[index+offset] = i.NEXT();
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return index;
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}
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#if !TYPE_OBJECT
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/**
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* A Function to convert a Primitive Iterator to a Object array.
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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*/
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public static GENERIC_KEY_BRACES int unwrap(CLASS_TYPE[] a, ITERATOR KEY_GENERIC_TYPE i) {
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return unwrap(a, i, 0, a.length);
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}
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/**
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* A Function to convert a Primitive Iterator to a Object array.
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @param offset the array offset where the start should be
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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*/
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public static GENERIC_KEY_BRACES int unwrap(CLASS_TYPE[] a, ITERATOR KEY_GENERIC_TYPE i, int offset) {
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return unwrap(a, i, offset, a.length - offset);
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}
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/**
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* A Function to convert a Primitive Iterator to a Object array.
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* Iterates over a iterator and inserts the values into the array and returns the amount that was inserted
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* @param a where the elements should be inserted
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* @param i the source iterator
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* @param offset the array offset where the start should be
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* @param max the maximum values that should be extracted from the source
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* @ArrayType(T)
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* @return the amount of elements that were inserted into the array.
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* @throws IllegalStateException if max is smaller the 0 or if the maximum index is larger then the array
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*/
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public static GENERIC_KEY_BRACES int unwrap(CLASS_TYPE[] a, ITERATOR KEY_GENERIC_TYPE i, int offset, int max) {
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if(max < 0) throw new IllegalStateException("The max size is smaller then 0");
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if(offset + max > a.length) throw new IllegalStateException("largest array index exceeds array size");
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int index = 0;
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for(;index<max && i.hasNext();index++) a[index+offset] = KEY_TO_OBJ(i.NEXT());
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return index;
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}
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#endif
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/**
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* A Helper function to pours all elements of a Iterator into a List
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* @param iter the elements that should be poured into list.
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* @ArrayType(T)
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* @return A list of all elements of the Iterator
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*/
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public static GENERIC_KEY_BRACES LIST KEY_GENERIC_TYPE pour(ITERATOR KEY_GENERIC_TYPE iter) {
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return pour(iter, Integer.MAX_VALUE);
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}
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/**
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* A Helper function to pours all elements of a Iterator into a List
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* @param iter the elements that should be poured into list.
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* @param max the maximum amount of elements that should be collected
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* @ArrayType(T)
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* @return A list of all requested elements of the Iterator
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*/
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public static GENERIC_KEY_BRACES LIST KEY_GENERIC_TYPE pour(ITERATOR KEY_GENERIC_TYPE iter, int max) {
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ARRAY_LIST KEY_GENERIC_TYPE list = new ARRAY_LISTBRACES();
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pour(iter, list, max);
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list.trim();
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return list;
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}
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/**
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* A Helper function to pours all elements of a Iterator into a Collection
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* @param iter the elements that should be poured into list.
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* @param c the collection where the elements should be poured into
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* @ArrayType(T)
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* @return the amount of elements that were added
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*/
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public static GENERIC_KEY_BRACES int pour(ITERATOR KEY_GENERIC_TYPE iter, COLLECTION KEY_GENERIC_TYPE c) {
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return pour(iter, c, Integer.MAX_VALUE);
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}
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/**
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* A Helper function to pours all elements of a Iterator into a Collection
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* @param iter the elements that should be poured into list.
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* @param c the collection where the elements should be poured into
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* @param max the maximum amount of elements that should be collected
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* @ArrayType(T)
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* @return the amount of elements that were added
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*/
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public static GENERIC_KEY_BRACES int pour(ITERATOR KEY_GENERIC_TYPE iter, COLLECTION KEY_GENERIC_TYPE c, int max) {
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if(max < 0) throw new IllegalStateException("Max is negative");
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int done = 0;
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for(;done<max && iter.hasNext();done++, c.add(iter.NEXT()));
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return done;
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}
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/**
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* Helper Iterator that concats other iterators together
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* @param array the Iterators that should be concatenated
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* @ArrayType(T)
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* @return iterator of the inputted iterators
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*/
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public static GENERIC_KEY_BRACES ITERATOR KEY_GENERIC_TYPE concat(ITERATOR KEY_GENERIC_TYPE... array) {
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return concat(array, 0, array.length);
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}
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/**
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* Helper Iterator that concats other iterators together
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* @param array the Iterators that should be concatenated
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* @param offset where to start within the array
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* @param length the length of the array
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* @ArrayType(T)
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* @return iterator of the inputted iterators
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*/
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public static GENERIC_KEY_BRACES ITERATOR KEY_GENERIC_TYPE concat(ITERATOR KEY_GENERIC_TYPE[] array, int offset, int length) {
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return new ConcatIteratorBRACES(array, offset, length);
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}
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private static class IteratorWrapper KEY_GENERIC_TYPE implements ITERATOR KEY_GENERIC_TYPE
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{
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Iterator<? extends CLASS_TYPE> iter;
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public IteratorWrapper(Iterator<? extends CLASS_TYPE> iter) {
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this.iter = iter;
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}
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@Override
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public boolean hasNext() {
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return iter.hasNext();
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}
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@Override
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public KEY_TYPE NEXT() {
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return OBJ_TO_KEY(iter.next());
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}
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#if !TYPE_OBJECT
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@Override
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@Deprecated
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public CLASS_TYPE next() {
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return iter.next();
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}
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#endif
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}
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private static class ConcatIterator KEY_GENERIC_TYPE implements ITERATOR KEY_GENERIC_TYPE
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{
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ITERATOR KEY_GENERIC_TYPE[] iters;
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int offset;
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int lastOffset = -1;
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int length;
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public ConcatIterator(ITERATOR KEY_GENERIC_TYPE[] iters, int offset, int length) {
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this.iters = iters;
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this.offset = offset;
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this.length = length;
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find();
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}
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private void find() {
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for(;length != 0 && !iters[offset].hasNext();length--, offset++);
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}
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@Override
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public boolean hasNext() {
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return length > 0;
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}
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@Override
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public KEY_TYPE NEXT() {
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if(!hasNext()) throw new NoSuchElementException();
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KEY_TYPE result = iters[lastOffset = offset].NEXT();
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find();
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return result;
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}
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@Override
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public void remove() {
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if(lastOffset == -1) throw new IllegalStateException();
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iters[lastOffset].remove();
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lastOffset = -1;
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}
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}
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private static class ReverseBiIterator KEY_GENERIC_TYPE implements BI_ITERATOR KEY_GENERIC_TYPE {
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BI_ITERATOR KEY_GENERIC_TYPE it;
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ReverseBiIterator(BI_ITERATOR KEY_GENERIC_TYPE it) {
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this.it = it;
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}
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@Override
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public KEY_TYPE NEXT() { return it.PREVIOUS(); }
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@Override
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public boolean hasNext() { return it.hasPrevious(); }
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@Override
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public boolean hasPrevious() { return it.hasNext(); }
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@Override
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public KEY_TYPE PREVIOUS() { return it.NEXT(); }
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@Override
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public void remove() { it.remove(); }
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}
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private static class ReverseListIterator KEY_GENERIC_TYPE implements LIST_ITERATOR KEY_GENERIC_TYPE {
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LIST_ITERATOR KEY_GENERIC_TYPE it;
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ReverseListIterator(LIST_ITERATOR KEY_GENERIC_TYPE it) {
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this.it = it;
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}
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@Override
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public KEY_TYPE NEXT() { return it.PREVIOUS(); }
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@Override
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public boolean hasNext() { return it.hasPrevious(); }
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@Override
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public boolean hasPrevious() { return it.hasNext(); }
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@Override
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public KEY_TYPE PREVIOUS() { return it.NEXT(); }
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@Override
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public void remove() { it.remove(); }
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@Override
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public int nextIndex() { return it.previousIndex(); }
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@Override
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public int previousIndex() { return it.nextIndex(); }
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@Override
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public void set(KEY_TYPE e) { it.set(e); }
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@Override
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public void add(KEY_TYPE e) { it.add(e); }
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}
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private static class UnmodifiableListIterator KEY_GENERIC_TYPE implements LIST_ITERATOR KEY_GENERIC_TYPE
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{
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LIST_ITERATOR KEY_GENERIC_TYPE iter;
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UnmodifiableListIterator(LIST_ITERATOR KEY_GENERIC_TYPE iter) {
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this.iter = iter;
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}
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@Override
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public boolean hasNext() {
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return iter.hasNext();
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}
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@Override
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public boolean hasPrevious() {
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return iter.hasPrevious();
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}
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@Override
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public int nextIndex() {
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return iter.nextIndex();
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}
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@Override
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public int previousIndex() {
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return iter.previousIndex();
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}
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@Override
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public void remove() { throw new UnsupportedOperationException(); }
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@Override
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public KEY_TYPE PREVIOUS() {
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return iter.PREVIOUS();
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}
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@Override
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public KEY_TYPE NEXT() {
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return iter.NEXT();
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}
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@Override
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public void set(KEY_TYPE e) { throw new UnsupportedOperationException(); }
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@Override
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public void add(KEY_TYPE e) { throw new UnsupportedOperationException(); }
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}
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private static class UnmodifiableBiIterator KEY_GENERIC_TYPE implements BI_ITERATOR KEY_GENERIC_TYPE
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{
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BI_ITERATOR KEY_GENERIC_TYPE iter;
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UnmodifiableBiIterator(BI_ITERATOR KEY_GENERIC_TYPE iter) {
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this.iter = iter;
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}
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@Override
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public KEY_TYPE NEXT() {
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return iter.NEXT();
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}
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@Override
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public boolean hasNext() {
|
|
return iter.hasNext();
|
|
}
|
|
|
|
@Override
|
|
public boolean hasPrevious() {
|
|
return iter.hasPrevious();
|
|
}
|
|
|
|
@Override
|
|
public KEY_TYPE PREVIOUS() {
|
|
return iter.PREVIOUS();
|
|
}
|
|
}
|
|
|
|
private static class UnmodifiableIterator KEY_GENERIC_TYPE implements ITERATOR KEY_GENERIC_TYPE
|
|
{
|
|
ITERATOR KEY_GENERIC_TYPE iterator;
|
|
|
|
UnmodifiableIterator(ITERATOR KEY_GENERIC_TYPE iterator) {
|
|
this.iterator = iterator;
|
|
}
|
|
|
|
@Override
|
|
public boolean hasNext() {
|
|
return iterator.hasNext();
|
|
}
|
|
|
|
@Override
|
|
public KEY_TYPE NEXT() {
|
|
return iterator.NEXT();
|
|
}
|
|
}
|
|
|
|
private static class EmptyIterator KEY_GENERIC_TYPE implements LIST_ITERATOR KEY_GENERIC_TYPE
|
|
{
|
|
@Override
|
|
public boolean hasNext() {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public KEY_TYPE NEXT() {
|
|
return EMPTY_KEY_VALUE;
|
|
}
|
|
|
|
@Override
|
|
public boolean hasPrevious() {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public KEY_TYPE PREVIOUS() {
|
|
return EMPTY_KEY_VALUE;
|
|
}
|
|
|
|
@Override
|
|
public int nextIndex() {
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public int previousIndex() {
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
public void remove() { throw new UnsupportedOperationException(); }
|
|
|
|
@Override
|
|
public void set(KEY_TYPE e) { throw new UnsupportedOperationException(); }
|
|
|
|
@Override
|
|
public void add(KEY_TYPE e) { throw new UnsupportedOperationException(); }
|
|
}
|
|
|
|
private static class ArrayIterator KEY_GENERIC_TYPE implements ITERATOR KEY_GENERIC_TYPE
|
|
{
|
|
KEY_TYPE[] a;
|
|
int from;
|
|
int to;
|
|
|
|
ArrayIterator(KEY_TYPE[] a, int from, int to) {
|
|
this.a = a;
|
|
this.from = from;
|
|
this.to = to;
|
|
}
|
|
|
|
@Override
|
|
public boolean hasNext() {
|
|
return from < to;
|
|
}
|
|
|
|
@Override
|
|
public KEY_TYPE NEXT() {
|
|
return a[from++];
|
|
}
|
|
|
|
@Override
|
|
public int skip(int amount) {
|
|
if(amount < 0) throw new IllegalStateException("Negative Numbers are not allowed");
|
|
int left = Math.min(amount, to - from);
|
|
from += left;
|
|
return amount - left;
|
|
}
|
|
}
|
|
} |