package org.apache.lucene.queries.function.valuesource;
/*
* 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.
*/
import org.apache.lucene.index.AtomicReaderContext;
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.BytesRef;
import java.util.Map;
import java.io.IOException;
/**
* Pass a the field value through as a String, no matter the type // Q: doesn't this mean it's a "string"?
*
**/
public class LiteralValueSource extends ValueSource {
protected final String string;
protected final BytesRef bytesRef;
public LiteralValueSource(String string) {
this.string = string;
this.bytesRef = new BytesRef(string);
}
/** returns the literal value */
public String getValue() {
return string;
}
@Override
public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
return new StrDocValues(this) {
@Override
public String strVal(int doc) {
return string;
}
@Override
public boolean bytesVal(int doc, BytesRef target) {
target.copyBytes(bytesRef);
return true;
}
@Override
public String toString(int doc) {
return string;
}
};
}
@Override
public String description() {
return "literal(" + string + ")";
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof LiteralValueSource)) return false;
LiteralValueSource that = (LiteralValueSource) o;
return string.equals(that.string);
}
public static final int hash = LiteralValueSource.class.hashCode();
@Override
public int hashCode() {
return hash + string.hashCode();
}
}