/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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 org.apache.geode.cache.query.internal.utils;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* Utility Iterator which provides limit functionality on a given iterator
*
* @param <E>
*/
public class LimitIterator<E> implements Iterator<E> {
private final Iterator<E> rootIter;
private final int limit;
private int numIterated = 0;
public LimitIterator(Iterator<E> rootIter, int limit) {
this.rootIter = rootIter;
this.limit = limit;
}
@Override
public boolean hasNext() {
if (this.numIterated < this.limit) {
return this.rootIter.hasNext();
} else {
return false;
}
}
@Override
public E next() {
if (this.numIterated < this.limit) {
++this.numIterated;
return this.rootIter.next();
} else {
throw new NoSuchElementException();
}
}
@Override
public void remove() {
throw new UnsupportedOperationException("Removal from limit based collection not supported");
}
}