57 lines
2.3 KiB
Java
57 lines
2.3 KiB
Java
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/*
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* Janino - An embedded Java[TM] compiler
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*
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* Copyright (c) 2001-2010, Arno Unkrig
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
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* following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.codehaus.janino.util.iterator;
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import java.util.Iterator;
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/**
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* An {@link java.util.Iterator} that transforms its elements on-the-fly.
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*
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* @param <T1> The element type of the delegate iterator
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* @param <T2> The element type of this iterator
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*/
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public abstract
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class TransformingIterator<T1, T2> implements Iterator<T2> {
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private final Iterator<T1> delegate;
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public
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TransformingIterator(Iterator<T1> delegate) { this.delegate = delegate; }
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@Override public boolean
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hasNext() { return this.delegate.hasNext(); }
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@Override public final T2
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next() { return this.transform(this.delegate.next()); }
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@Override public void
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remove() { this.delegate.remove(); }
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/** Derived classes must implement this method such that it does the desired transformation. */
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protected abstract T2 transform(T1 o);
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}
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