org.apache.jackrabbit.oak.plugins.index.cursor.PathCursor Maven / Gradle / Ivy
/*
* 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.oak.plugins.index.cursor;
import static org.apache.jackrabbit.oak.commons.PathUtils.isAbsolute;
import java.util.HashSet;
import java.util.Iterator;
import org.apache.jackrabbit.oak.query.FilterIterators;
import org.apache.jackrabbit.oak.query.index.IndexRowImpl;
import org.apache.jackrabbit.oak.spi.query.Cursor;
import org.apache.jackrabbit.oak.spi.query.IndexRow;
import org.apache.jackrabbit.oak.spi.query.QueryLimits;
import org.jetbrains.annotations.Nullable;
import org.apache.jackrabbit.guava.common.base.Predicate;
import org.apache.jackrabbit.guava.common.collect.Iterators;
/**
* PathCursor implements a simple {@link Cursor} that iterates
* over a {@link String} based path {@link Iterable}.
*/
public class PathCursor extends AbstractCursor {
private final Iterator iterator;
public PathCursor(Iterator paths, boolean distinct, final QueryLimits settings) {
Iterator it = paths;
if (distinct) {
it = Iterators.filter(it, new Predicate() {
private final HashSet known = new HashSet();
@Override
public boolean apply(@Nullable String input) {
FilterIterators.checkMemoryLimit(known.size(), settings);
// Set.add returns true for new entries
return known.add(input);
}
});
}
this.iterator = it;
}
@Override
public IndexRow next() {
// TODO support jcr:score and possibly rep:excerpt
String path = iterator.next();
return new IndexRowImpl(isAbsolute(path) ? path : "/" + path);
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
}