/*
* 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 java.io.IOException;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
import org.apache.lucene.index.Payload;
/**
* <code>SingletonTokenStream</code> implements a token stream that wraps a
* single value with a given property type. The property type is stored as a
* payload on the single returned token.
*/
public final class SingletonTokenStream extends TokenStream {
/**
* The string value of the token.
*/
private String value;
/**
* The payload of the token.
*/
private Payload payload;
/**
* The term attribute of the current token
*/
private TermAttribute termAttribute;
/**
* The payload attribute of the current token
*/
private PayloadAttribute payloadAttribute;
private boolean consumed = false;
/**
* Creates a new SingleTokenStream with the given value and payload.
*
* @param value
* the string value that will be returned with the token.
* @param payload
* the payload that will be attached to this token
*/
public SingletonTokenStream(String value, Payload payload) {
this.value = value;
this.payload = payload;
termAttribute = (TermAttribute) addAttribute(TermAttribute.class);
payloadAttribute = (PayloadAttribute) addAttribute(PayloadAttribute.class);
}
/**
* Creates a new SingleTokenStream with the given value and a property
* <code>type</code>.
*
* @param value
* the string value that will be returned with the token.
* @param type
* the JCR property type.
*/
public SingletonTokenStream(String value, int type) {
this(value, new Payload(new PropertyMetaData(type).toByteArray()));
}
@Override
public boolean incrementToken() throws IOException {
if (consumed) {
return false;
}
clearAttributes();
termAttribute.setTermBuffer(value);
payloadAttribute.setPayload(payload);
consumed = true;
return true;
}
/**
* {@inheritDoc}
*/
@Override
public void reset() throws IOException {
consumed = false;
}
/**
* {@inheritDoc}
*/
@Override
public void close() throws IOException {
consumed = true;
value = null;
payload = null;
payloadAttribute = null;
termAttribute = null;
}
}