/*
 * 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
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package org.apache.lucene.queries.function.valuesource;

import java.io.IOException;
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.BoolDocValues;
import org.apache.lucene.search.IndexSearcher;

Base class for comparison operators useful within an "if"/conditional.
/** * Base class for comparison operators useful within an "if"/conditional. */
public abstract class ComparisonBoolFunction extends BoolFunction { private final ValueSource lhs; private final ValueSource rhs; private final String name; public ComparisonBoolFunction(ValueSource lhs, ValueSource rhs, String name) { this.lhs = lhs; this.rhs = rhs; this.name = name; }
Perform the comparison, returning true or false
/** Perform the comparison, returning true or false */
public abstract boolean compare(int doc, FunctionValues lhs, FunctionValues rhs) throws IOException;
Uniquely identify the operation (ie "gt", "lt" "gte", etc)
/** Uniquely identify the operation (ie "gt", "lt" "gte", etc) */
public String name() { return this.name; } @Override public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { final FunctionValues lhsVal = this.lhs.getValues(context, readerContext); final FunctionValues rhsVal = this.rhs.getValues(context, readerContext); final String compLabel = this.name(); return new BoolDocValues(this) { @Override public boolean boolVal(int doc) throws IOException { return compare(doc, lhsVal, rhsVal); } @Override public String toString(int doc) throws IOException { return compLabel + "(" + lhsVal.toString(doc) + "," + rhsVal.toString(doc) + ")"; } @Override public boolean exists(int doc) throws IOException { return lhsVal.exists(doc) && rhsVal.exists(doc); } }; } @Override public boolean equals(Object o) { if (this.getClass() != o.getClass()) return false; ComparisonBoolFunction other = (ComparisonBoolFunction)o; return name().equals(other.name()) && lhs.equals(other.lhs) && rhs.equals(other.rhs); } @Override public int hashCode() { int h = this.getClass().hashCode(); h = h * 31 + this.name().hashCode(); h = h * 31 + lhs.hashCode(); h = h * 31 + rhs.hashCode(); return h; } @Override public String description() { return name() + "(" + lhs.description() + "," + rhs.description() + ")"; } @Override public void createWeight(Map context, IndexSearcher searcher) throws IOException { lhs.createWeight(context, searcher); rhs.createWeight(context, searcher); } }