package org.apache.lucene.analysis;
/*
* 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.
*/
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionLengthAttribute;
import org.apache.lucene.analysis.tokenattributes.TermToBytesRefAttribute;
import org.apache.lucene.util.AttributeImpl;
import org.apache.lucene.util.BytesRef;
/**
* TokenStream from a canned list of binary (BytesRef-based)
* tokens.
*/
public final class CannedBinaryTokenStream extends TokenStream {
/** Represents a binary token. */
public final static class BinaryToken {
BytesRef term;
int posInc;
int posLen;
int startOffset;
int endOffset;
public BinaryToken(BytesRef term) {
this.term = term;
this.posInc = 1;
this.posLen = 1;
}
public BinaryToken(BytesRef term, int posInc, int posLen) {
this.term = term;
this.posInc = posInc;
this.posLen = posLen;
}
}
private final BinaryToken[] tokens;
private int upto = 0;
private final BinaryTermAttribute termAtt = addAttribute(BinaryTermAttribute.class);
private final PositionIncrementAttribute posIncrAtt = addAttribute(PositionIncrementAttribute.class);
private final PositionLengthAttribute posLengthAtt = addAttribute(PositionLengthAttribute.class);
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
/** An attribute extending {@link
* TermToBytesRefAttribute} but exposing {@link
* #setBytesRef} method. */
public interface BinaryTermAttribute extends TermToBytesRefAttribute {
/** Set the current binary value. */
public void setBytesRef(BytesRef bytes);
}
/** Implementation for {@link BinaryTermAttribute}. */
public final static class BinaryTermAttributeImpl extends AttributeImpl implements BinaryTermAttribute, TermToBytesRefAttribute {
private final BytesRef bytes = new BytesRef();
@Override
public int fillBytesRef() {
return bytes.hashCode();
}
@Override
public BytesRef getBytesRef() {
return bytes;
}
@Override
public void setBytesRef(BytesRef bytes) {
this.bytes.copyBytes(bytes);
}
@Override
public void clear() {
}
@Override
public boolean equals(Object other) {
return other == this;
}
@Override
public int hashCode() {
return System.identityHashCode(this);
}
@Override
public void copyTo(AttributeImpl target) {
BinaryTermAttributeImpl other = (BinaryTermAttributeImpl) target;
other.bytes.copyBytes(bytes);
}
@Override
public BinaryTermAttributeImpl clone() {
throw new UnsupportedOperationException();
}
}
public CannedBinaryTokenStream(BinaryToken... tokens) {
super();
this.tokens = tokens;
}
@Override
public boolean incrementToken() {
if (upto < tokens.length) {
final BinaryToken token = tokens[upto++];
// TODO: can we just capture/restoreState so
// we get all attrs...?
clearAttributes();
termAtt.setBytesRef(token.term);
posIncrAtt.setPositionIncrement(token.posInc);
posLengthAtt.setPositionLength(token.posLen);
offsetAtt.setOffset(token.startOffset, token.endOffset);
return true;
} else {
return false;
}
}
}