blob: 86253a9e74e6ee05e64ef2aa43c06c14f93b108a [file] [log] [blame]
/*
* 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.sling.resourceresolver.impl.helper;
import java.util.Iterator;
import java.util.NoSuchElementException;
public abstract class AbstractIterator<T> implements Iterator<T> {
private T nextElement;
protected abstract T seek();
@Override
public boolean hasNext() {
if (nextElement == null) {
nextElement = seek();
}
return nextElement != null;
}
@Override
public T next() {
if (nextElement == null && !hasNext()) {
throw new NoSuchElementException();
}
final T result = nextElement;
nextElement = null;
return result;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}