org.apache.lucene.facet.taxonomy.OrdinalsReader.java Source code

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Here is the source code for org.apache.lucene.facet.taxonomy.OrdinalsReader.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.facet.taxonomy;

import java.io.IOException;

import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.util.IntsRef;

/** Provides per-document ordinals. */

public abstract class OrdinalsReader {

    /** Returns ordinals for documents in one segment. */
    public static abstract class OrdinalsSegmentReader {
        /** Get the ordinals for this document.  ordinals.offset
         *  must always be 0! */
        public abstract void get(int doc, IntsRef ordinals) throws IOException;

        /** Default constructor. */
        public OrdinalsSegmentReader() {
        }
    }

    /** Default constructor. */
    public OrdinalsReader() {
    }

    /** Set current atomic reader. */
    public abstract OrdinalsSegmentReader getReader(LeafReaderContext context) throws IOException;

    /** Returns the indexed field name this {@code
     *  OrdinalsReader} is reading from. */
    public abstract String getIndexFieldName();
}