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SOLR-2371: adds min function, makes max take two value sources 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1071658 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Grant Ingersoll 2011-02-17 15:52:33 +00:00
parent ff77defb92
commit 545ea4021b
1 changed files with 0 additions and 100 deletions
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100
solr/src/java/org/apache/solr/search/function/MaxFloatFunction.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.solr.search.function;
import org.apache.lucene.index.IndexReader.AtomicReaderContext;
import org.apache.lucene.search.IndexSearcher;
import java.io.IOException;
import java.util.Map;
/**
* Returns the max of a ValueSource and a float
* (which is useful for "bottoming out" another function at 0.0,
* or some positive number).
* <br>
* Normally Used as an argument to a {@link FunctionQuery}
*
* @version $Id$
*/
public class MaxFloatFunction extends ValueSource {
protected final ValueSource source;
protected final float fval;
public MaxFloatFunction(ValueSource source, float fval) {
this.source = source;
this.fval = fval;
}
@Override
public String description() {
return "max(" + source.description() + "," + fval + ")";
}
@Override
public DocValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
final DocValues vals = source.getValues(context, readerContext);
return new DocValues() {
@Override
public float floatVal(int doc) {
float v = vals.floatVal(doc);
return v < fval ? fval : v;
}
@Override
public int intVal(int doc) {
return (int)floatVal(doc);
}
@Override
public long longVal(int doc) {
return (long)floatVal(doc);
}
@Override
public double doubleVal(int doc) {
return (double)floatVal(doc);
}
@Override
public String strVal(int doc) {
return Float.toString(floatVal(doc));
}
@Override
public String toString(int doc) {
return "max(" + vals.toString(doc) + "," + fval + ")";
}
};
}
@Override
public void createWeight(Map context, IndexSearcher searcher) throws IOException {
source.createWeight(context, searcher);
}
@Override
public int hashCode() {
int h = Float.floatToIntBits(fval);
h = (h >>> 2) | (h << 30);
return h + source.hashCode();
}
@Override
public boolean equals(Object o) {
if (MaxFloatFunction.class != o.getClass()) return false;
MaxFloatFunction other = (MaxFloatFunction)o;
return this.fval == other.fval
&& this.source.equals(other.source);
}
}