com.google.common.collect.ForwardingIterator.java Source code

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Here is the source code for com.google.common.collect.ForwardingIterator.java

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/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;

import java.util.Iterator;

/**
 * An iterator which forwards all its method calls to another iterator.
 * Subclasses should override one or more methods to modify the behavior of the
 * backing iterator as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * @author Kevin Bourrillion
 * @since 2.0
 */
@GwtCompatible
public abstract class ForwardingIterator<T> extends ForwardingObject implements Iterator<T> {

    /** Constructor for use by subclasses. */
    protected ForwardingIterator() {
    }

    @Override
    protected abstract Iterator<T> delegate();

    @Override
    public boolean hasNext() {
        return delegate().hasNext();
    }

    @Override
    public T next() {
        return delegate().next();
    }

    @Override
    public void remove() {
        delegate().remove();
    }
}