com.qwazr.search.index.IndexUtils.java Source code

Introduction

Here is the source code for com.qwazr.search.index.IndexUtils.java

Source

/**
 * Copyright 2015-2016 Emmanuel Keller / QWAZR
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.qwazr.search.index;

import com.qwazr.classloader.ClassLoaderManager;
import com.qwazr.search.field.FieldDefinition;
import com.qwazr.utils.ClassLoaderUtils;
import org.apache.lucene.facet.sortedset.DefaultSortedSetDocValuesReaderState;
import org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.SlowCompositeReaderWrapper;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.search.similarities.Similarity;

import java.io.IOException;

class IndexUtils {

    final static String[] similarityClassPrefixes = { "", "com.qwazr.search.similarity.",
            "org.apache.lucene.search.similarities." };

    final static Similarity findSimilarity(String similarity)
            throws InterruptedException, ReflectiveOperationException, IOException {
        return (Similarity) ClassLoaderUtils
                .findClass(ClassLoaderManager.classLoader, similarity, similarityClassPrefixes).newInstance();
    }

    final static SortedSetDocValuesReaderState getNewFacetsState(IndexReader indexReader) throws IOException {
        LeafReader topReader = SlowCompositeReaderWrapper.wrap(indexReader);
        if (topReader == null)
            return null;
        SortedSetDocValues dv = topReader.getSortedSetDocValues(FieldDefinition.FACET_FIELD);
        if (dv == null)
            return null;
        return new DefaultSortedSetDocValuesReaderState(indexReader, FieldDefinition.FACET_FIELD);
    }

}