org.apache.solr.analytics.util.valuesource.MultiStringFunction Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of solr-analytics Show documentation

Apache Solr Content Analytics Package

There is a newer version: 9.7.0

/*
 * 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.solr.analytics.util.valuesource;

import java.io.IOException;
import java.util.Arrays;
import java.util.Map;

import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.StrDocValues;
import org.apache.lucene.util.BytesRefBuilder;
import org.apache.lucene.util.mutable.MutableValue;
import org.apache.lucene.util.mutable.MutableValueStr;

/**
 * Abstract {@link ValueSource} implementation which wraps multiple ValueSources
 * and applies an extendible string function to their values.
 **/
public abstract class MultiStringFunction extends ValueSource {
  protected final ValueSource[] sources;
  
  public MultiStringFunction(ValueSource[] sources) {
    this.sources = sources;
  }

  abstract protected String name();
  abstract protected CharSequence func(int doc, FunctionValues[] valsArr);

  @Override
  public String description() {
    StringBuilder sb = new StringBuilder();
    sb.append(name()).append('(');
    boolean firstTime=true;
    for (ValueSource source : sources) {
      if (firstTime) {
        firstTime=false;
      } else {
        sb.append(',');
      }
      sb.append(source);
    }
    sb.append(')');
    return sb.toString();
  }

  @Override
  public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException {
    final FunctionValues[] valsArr = new FunctionValues[sources.length];
    for (int i=0; i