org.apache.solr.search.function.MultiStringFunction Maven / Gradle / Ivy
/*
* 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.search.function;
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) throws IOException;
@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