/*
* 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.jackrabbit.core.integration.random.operation;
import org.apache.jackrabbit.commons.iterator.NodeIteratorAdapter;
import javax.jcr.NodeIterator;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
/**
* <code>GetRandomNodes</code> randomly returns nodes that were returned by
* the parent operation.
*/
public class GetRandomNodes extends Operation {
private final Operation op;
public GetRandomNodes(Session s, Operation op) {
super(s, "/");
this.op = op;
}
/**
* Randomly returns node from the parent operation. Please note that the
* returned iterator runs forever!!!
* {@link NodeIterator#hasNext()} will always return true.
*/
public NodeIterator execute() throws Exception {
final List paths = new ArrayList();
for (NodeIterator it = op.execute(); it.hasNext(); ) {
paths.add(it.nextNode().getPath());
}
return new NodeIteratorAdapter(new Iterator() {
public boolean hasNext() {
// runs forever!!!
return true;
}
public Object next() {
String path = (String) paths.get(getRandom().nextInt(paths.size()));
try {
return getSession().getItem(path);
} catch (RepositoryException e) {
throw new NoSuchElementException();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
});
}
}