/*
* 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.mk.index;
import java.util.Iterator;
import org.apache.jackrabbit.mk.json.JsopReader;
import org.apache.jackrabbit.mk.json.JsopTokenizer;
import org.apache.jackrabbit.mk.simple.NodeImpl;
/**
* An index for all values with a given prefix.
*/
public class PrefixIndex implements Index {
private final Indexer indexer;
private final BTree tree;
private final String prefix;
public PrefixIndex(Indexer indexer, String prefix) {
this.indexer = indexer;
this.prefix = prefix;
this.tree = new BTree(indexer, "prefix:" + prefix, false);
tree.setMinSize(10);
}
public static PrefixIndex fromNodeName(Indexer indexer, String nodeName) {
if (!nodeName.startsWith("prefix:")) {
return null;
}
String prefix = nodeName.substring("prefix:".length());
return new PrefixIndex(indexer, prefix);
}
@Override
public String getName() {
return tree.getName();
}
@Override
public void addOrRemoveNode(NodeImpl node, boolean add) {
String nodePath = node.getPath();
for (int i = 0, size = node.getPropertyCount(); i < size; i++) {
String propertyName = node.getProperty(i);
String value = node.getPropertyValue(i);
addOrRemoveProperty(nodePath, propertyName, value, add);
}
}
@Override
public void addOrRemoveProperty(String nodePath, String propertyName,
String value, boolean add) {
JsopTokenizer t = new JsopTokenizer(value);
if (t.matches(JsopReader.STRING)) {
String v = t.getToken();
if (v.startsWith(prefix)) {
addOrRemove(nodePath, propertyName, v, add);
}
} else if (t.matches('[')) {
if (!t.matches(']')) {
do {
if (t.matches(JsopReader.STRING)) {
String v = t.getToken();
if (v.startsWith(prefix)) {
addOrRemove(nodePath, propertyName, v, add);
}
} else if (t.matches(JsopReader.FALSE)) {
// ignore
} else if (t.matches(JsopReader.TRUE)) {
// ignore
} else if (t.matches(JsopReader.NULL)) {
// ignore
} else if (t.matches(JsopReader.NUMBER)) {
// ignore
}
} while (t.matches(','));
t.read(']');
}
}
}
private void addOrRemove(String path, String propertyName, String value, boolean add) {
String v = value.substring(prefix.length());
if (add) {
tree.add(v, path + "/" + propertyName);
} else {
tree.remove(v, path + "/" + propertyName);
}
}
/**
* Get an iterator over the paths for the given property value.
*
* @param value the value (including the prefix)
* @param revision the revision
* @return an iterator of the paths (an empty iterator if not found)
* @throws IllegalArgumentException if the value doesn't start with the prefix
*/
@Override
public Iterator<String> getPaths(String value, String revision) {
if (!value.startsWith(prefix)) {
throw new IllegalArgumentException(
"The value doesn't start with \"" + prefix + "\": " + value);
}
String v = value.substring(prefix.length());
indexer.updateUntil(revision);
Cursor c = tree.findFirst(v);
return new Cursor.RangeIterator(c, v);
}
@Override
public boolean isUnique() {
return tree.isUnique();
}
}