/*
* 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.query.lucene;
import org.apache.lucene.search.Query;
import org.apache.jackrabbit.core.id.NodeId;
import org.apache.jackrabbit.core.id.PropertyId;
import org.apache.jackrabbit.core.value.InternalValue;
import org.apache.jackrabbit.core.state.ItemStateManager;
import org.apache.jackrabbit.core.state.NodeState;
import org.apache.jackrabbit.core.state.PropertyState;
import org.apache.jackrabbit.core.state.ItemStateException;
import org.apache.jackrabbit.spi.Name;
import javax.jcr.PropertyType;
import java.io.IOException;
import java.util.Iterator;
/**
* <code>SimpleExcerptProvider</code> is a <b>very</b> simple excerpt provider.
* It does not do any highlighting and simply returns up to
* <code>maxFragmentSize</code> characters of string properties for a given
* node.
* @see #getExcerpt(org.apache.jackrabbit.core.NodeId, int, int)
*/
public class SimpleExcerptProvider implements ExcerptProvider {
/**
* The item state manager.
*/
private ItemStateManager ism;
/**
* {@inheritDoc}
*/
public void init(Query query, SearchIndex index) throws IOException {
ism = index.getContext().getItemStateManager();
}
/**
* {@inheritDoc}
*/
public String getExcerpt(NodeId id, int maxFragments, int maxFragmentSize)
throws IOException {
StringBuffer text = new StringBuffer();
try {
NodeState nodeState = (NodeState) ism.getItemState(id);
String separator = "";
Iterator it = nodeState.getPropertyNames().iterator();
while (it.hasNext() && text.length() < maxFragmentSize) {
PropertyId propId = new PropertyId(id, (Name) it.next());
PropertyState propState = (PropertyState) ism.getItemState(propId);
if (propState.getType() == PropertyType.STRING) {
text.append(separator);
separator = " ... ";
InternalValue[] values = propState.getValues();
for (int i = 0; i < values.length; i++) {
text.append(values[i].toString());
}
}
}
} catch (ItemStateException e) {
// ignore
}
if (text.length() > maxFragmentSize) {
int lastSpace = text.lastIndexOf(" ", maxFragmentSize);
if (lastSpace != -1) {
text.setLength(lastSpace);
} else {
text.setLength(maxFragmentSize);
}
text.append(" ...");
}
return "<excerpt><fragment>" + text.toString() + "</fragment></excerpt>";
}
}