/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.spargel.java;
import java.util.Iterator;
import eu.stratosphere.api.java.tuple.Tuple2;
/**
* An iterator that returns messages. The iterator is {@link java.lang.Iterable} at the same time to support
* the <i>foreach</i> syntax.
*/
public final class MessageIterator<Message> implements Iterator<Message>, Iterable<Message>, java.io.Serializable {
private static final long serialVersionUID = 1L;
private transient Iterator<Tuple2<?, Message>> source;
final void setSource(Iterator<Tuple2<?, Message>> source) {
this.source = source;
}
@Override
public final boolean hasNext() {
return this.source.hasNext();
}
@Override
public final Message next() {
return this.source.next().f1;
}
@Override
public final void remove() {
throw new UnsupportedOperationException();
}
@Override
public Iterator<Message> iterator() {
return this;
}
}