groovy.stream.iterators.ConcatenationIterator Maven / Gradle / Ivy

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A collection of classes to give a fluent builder for Streams (Lazy Groovy Generators).

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/*
 * Copyright 2013-2014 the original author or 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 groovy.stream.iterators ;

import java.util.Iterator ;

public class ConcatenationIterator extends AbstractIterator {
    private final Iterator last ;

    public ConcatenationIterator( Iterator first,
                                  Iterator last ) {
        super( first ) ;
        this.last = last ;
    }

    @Override
    protected void loadNext() {
        if( !iterator.hasNext() && !last.hasNext() ) {
            exhausted = true ;
        }
        else if( iterator.hasNext() ) {
            current = iterator.next() ;
        }
        else {
            current = last.next() ;
        }
    }
}