/*
* 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.unique;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Iterator;
import java.util.List;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.plugins.memory.MemoryNodeState;
import org.apache.jackrabbit.oak.query.index.IndexRowImpl;
import org.apache.jackrabbit.oak.spi.query.Cursor;
import org.apache.jackrabbit.oak.spi.query.Filter;
import org.apache.jackrabbit.oak.spi.query.IndexRow;
import org.apache.jackrabbit.oak.spi.query.QueryIndex;
import org.apache.jackrabbit.oak.spi.query.Filter.PropertyRestriction;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import com.google.common.base.Charsets;
import com.google.common.collect.Lists;
public class UniqueIndex implements QueryIndex {
@Override
public String getIndexName() {
return "jcr:uuid";
}
@Override
public double getCost(Filter filter) {
PropertyRestriction pr = filter.getPropertyRestriction("jcr:uuid");
if (pr != null
&& "/".equals(filter.getPath())
&& filter.getPathRestriction() == Filter.PathRestriction.ALL_CHILDREN
&& filter.getFulltextConditions().isEmpty()
&& filter.getPropertyRestrictions().size() == 1) {
return 1.0;
} else {
return Double.MAX_VALUE;
}
}
@Override
public String getPlan(Filter filter) {
return "jcr:uuid";
}
@Override
public Cursor query(Filter filter, String revisionId, NodeState root) {
NodeState state = root.getChildNode("jcr:system");
if (state != null) {
state = state.getChildNode(":unique");
}
if (state != null) {
state = state.getChildNode("jcr:uuid");
}
if (state == null) {
state = MemoryNodeState.EMPTY_NODE;
}
List<String> paths = Lists.newArrayList();
PropertyRestriction pr = filter.getPropertyRestriction("jcr:uuid");
String value = pr.first.getString();
try {
value = URLEncoder.encode(value, Charsets.UTF_8.name());
} catch (UnsupportedEncodingException e) {
// ignore
}
PropertyState property = state.getProperty(pr.first.getString());
if (property != null && !property.isArray()) {
paths.add(property.getValue().getString());
}
final Iterator<String> iterator = paths.iterator();
return new Cursor() {
private String currentPath = null;
@Override
public boolean next() {
if (iterator.hasNext()) {
currentPath = "/" + iterator.next();
return true;
} else {
return false;
}
}
@Override
public IndexRow currentRow() {
return new IndexRowImpl(currentPath);
}
};
}
}