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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.core.util; import java.util.*; /** * An Iterator that will NEVER throw a NoSuchElementException * when next() is called. The primary utility (discovered to date) for this * class is for converting a variable number (ussually <= n), but ordered * "stream" of things (the wrapped Iterator), into another form where you * do not want or care (or even want to care) if there are enough of them.<p> * * @author George Smith * @version 1.0 7/28/01 */ public final class InfiniteNextIterator<T> extends AbstractWrappingIterator<T> { /** * Construct an Iterator that will NEVER throw a NoSuchElementException * when next() is called.<p> * * @param pIterator the wrapped Iterator (!null). * @param pBeyondEndValue the value to return from next() when * NoSuchElementException would have been thown (null OK). */ public InfiniteNextIterator( Iterator<T> pIterator, T pBeyondEndValue ) throws NullPointerException { super( pIterator ); zBeyondEndValue = pBeyondEndValue; } /** * Construct an Iterator that will NEVER throw a NoSuchElementException * when next() is called.<p> * * @param pIterator the wrapped Iterator (!null). */ public InfiniteNextIterator( Iterator<T> pIterator ) throws NullPointerException { this( pIterator, null ); } private T zBeyondEndValue; /** * Returns the next object in the wrapped Iterator while there is more * (hasNext), otherwise returns the BeyondEndValue (which defaults to null).<p> * <p/> * Note: This implementation of next() will NEVER throw a NoSuchElementException.<p> * * @return the next object in the stream or BeyondEndValue.<p> * * @see <a href="http://java.sun.com/j2se/1.3/docs/api/java/lang/Util/Iterator.html#next()">java.util.Iterator#next()</a> */ @Override public T next() { return hasNext() ? super.next() : zBeyondEndValue; } } |