org.apache.lucene.index.SingleTermsEnum.java Source code

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Here is the source code for org.apache.lucene.index.SingleTermsEnum.java

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/*
 * 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.lucene.index;

import org.apache.lucene.search.MultiTermQuery; // javadocs
import org.apache.lucene.util.BytesRef;

/**
 * Subclass of FilteredTermsEnum for enumerating a single term.
 * <p>
 * For example, this can be used by {@link MultiTermQuery}s
 * that need only visit one term, but want to preserve
 * MultiTermQuery semantics such as {@link
 * MultiTermQuery#getRewriteMethod}.
 */
public final class SingleTermsEnum extends FilteredTermsEnum {
    private final BytesRef singleRef;

    /**
     * Creates a new <code>SingleTermsEnum</code>.
     * <p>
     * After calling the constructor the enumeration is already pointing to the term,
     * if it exists.
     */
    public SingleTermsEnum(TermsEnum tenum, BytesRef termText) {
        super(tenum);
        singleRef = termText;
        setInitialSeekTerm(termText);
    }

    @Override
    protected AcceptStatus accept(BytesRef term) {
        return term.equals(singleRef) ? AcceptStatus.YES : AcceptStatus.END;
    }

}