| /* |
| * 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 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. |
| */ |
| 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 */ |
| public abstract boolean compare(int doc, FunctionValues lhs, FunctionValues rhs) throws IOException; |
| |
| /** 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); |
| } |
| |
| } |