org.apache.lucene.queries.function.valuesource.ConstValueSource.java Source code

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Here is the source code for org.apache.lucene.queries.function.valuesource.ConstValueSource.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.lucene.queries.function.valuesource;

import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.docvalues.FloatDocValues;

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

/**
 * <code>ConstValueSource</code> returns a constant for all documents
 */
public class ConstValueSource extends ConstNumberSource {
    final float constant;
    private final double dv;

    public ConstValueSource(float constant) {
        this.constant = constant;
        this.dv = constant;
    }

    @Override
    public String description() {
        return "const(" + constant + ")";
    }

    @Override
    public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException {
        return new FloatDocValues(this) {
            @Override
            public float floatVal(int doc) {
                return constant;
            }

            @Override
            public int intVal(int doc) {
                return (int) constant;
            }

            @Override
            public long longVal(int doc) {
                return (long) constant;
            }

            @Override
            public double doubleVal(int doc) {
                return dv;
            }

            @Override
            public String toString(int doc) {
                return description();
            }

            @Override
            public Object objectVal(int doc) {
                return constant;
            }

            @Override
            public boolean boolVal(int doc) {
                return constant != 0.0f;
            }
        };
    }

    @Override
    public int hashCode() {
        return Float.floatToIntBits(constant) * 31;
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof ConstValueSource))
            return false;
        ConstValueSource other = (ConstValueSource) o;
        return this.constant == other.constant;
    }

    @Override
    public int getInt() {
        return (int) constant;
    }

    @Override
    public long getLong() {
        return (long) constant;
    }

    @Override
    public float getFloat() {
        return constant;
    }

    @Override
    public double getDouble() {
        return dv;
    }

    @Override
    public Number getNumber() {
        return constant;
    }

    @Override
    public boolean getBool() {
        return constant != 0.0f;
    }
}