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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.analysis;
import org.apache.lucene.analysis.NumericTokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.util.Attribute;
import org.apache.lucene.util.AttributeFactory;
import org.apache.lucene.util.AttributeImpl;
import org.apache.lucene.util.AttributeSource;
import org.elasticsearch.common.io.Streams;
import java.io.IOException;
import java.util.Iterator;
/**
*
*/
public abstract class NumericTokenizer extends Tokenizer {
/** Make this tokenizer get attributes from the delegate token stream. */
private static final AttributeFactory delegatingAttributeFactory(final AttributeSource source) {
return new AttributeFactory() {
@Override
public AttributeImpl createAttributeInstance(Class attClass) {
return (AttributeImpl) source.addAttribute(attClass);
}
};
}
private final NumericTokenStream numericTokenStream;
private final char[] buffer;
protected final Object extra;
private boolean started;
protected NumericTokenizer(NumericTokenStream numericTokenStream, char[] buffer, Object extra) throws IOException {
super(delegatingAttributeFactory(numericTokenStream));
this.numericTokenStream = numericTokenStream;
// Add attributes from the numeric token stream, this works fine because the attribute factory delegates to numericTokenStream
for (Iterator> it = numericTokenStream.getAttributeClassesIterator(); it.hasNext();) {
addAttribute(it.next());
}
this.extra = extra;
this.buffer = buffer;
started = true;
}
@Override
public void reset() throws IOException {
super.reset();
started = false;
}
@Override
public final boolean incrementToken() throws IOException {
if (!started) {
// reset() must be idempotent, this is why we read data in incrementToken
final int len = Streams.readFully(input, buffer);
if (len == buffer.length && input.read() != -1) {
throw new IOException("Cannot read numeric data larger than " + buffer.length + " chars");
}
setValue(numericTokenStream, new String(buffer, 0, len));
numericTokenStream.reset();
started = true;
}
return numericTokenStream.incrementToken();
}
@Override
public void end() throws IOException {
super.end();
numericTokenStream.end();
}
@Override
public void close() throws IOException {
super.close();
numericTokenStream.close();
}
protected abstract void setValue(NumericTokenStream tokenStream, String value);
}