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package org.apache.lucene.analysis.tokenattributes;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import org.apache.lucene.analysis.TokenStream;
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import org.apache.lucene.util.AttributeImpl;
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*This attribute can be used to mark a token as a keyword. Keyword aware
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* {@link TokenStream}s can decide to modify a token based on the return value
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* of {@link #isKeyword()} if the token is modified. Stemming filters for
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* instance can use this attribute to conditionally skip a term if
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* {@link #isKeyword()} returns <code>true</code>.
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public final class KeywordAttributeImpl extends AttributeImpl implements
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private boolean keyword;
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public void copyTo(AttributeImpl target) {
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KeywordAttribute attr = (KeywordAttribute) target;
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attr.setKeyword(keyword);
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public int hashCode() {
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return keyword ? 31 : 37;
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public boolean equals(Object obj) {
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if (getClass() != obj.getClass())
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final KeywordAttributeImpl other = (KeywordAttributeImpl) obj;
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return keyword == other.keyword;
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* Returns <code>true</code> iff the current token is a keyword, otherwise
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* @return <code>true</code> iff the current token is a keyword, otherwise
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public boolean isKeyword() {
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* Marks the current token as keyword iff set to <code>true</code>.
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* <code>true</code> iff the current token is a keyword, otherwise
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public void setKeyword(boolean isKeyword) {