src/main/java/org/apache/sling/scripting/sightly/java/compiler/impl/operator/NumericOpGen.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,
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 * See the License for the specific language governing permissions and
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package org.apache.sling.scripting.sightly.java.compiler.impl.operator;

import org.apache.sling.scripting.sightly.compiler.expression.nodes.BinaryOperator;
import org.apache.sling.scripting.sightly.java.compiler.impl.ExpressionTranslator;
import org.apache.sling.scripting.sightly.java.compiler.impl.GenHelper;
import org.apache.sling.scripting.sightly.java.compiler.impl.JavaSource;
import org.apache.sling.scripting.sightly.java.compiler.impl.SourceGenConstants;
import org.apache.sling.scripting.sightly.java.compiler.impl.Type;

/**
 * Generator for numeric value
 */
public class NumericOpGen implements BinaryOpGen {

    private static final String OBJECT_NAME = BinaryOperator.class.getName();
    private static final String METHOD_NAME = "eval";

    private final String javaOperator;
    private final BinaryOperator binaryOperator;

    public NumericOpGen(String javaOperator, BinaryOperator binaryOperator) {
        this.javaOperator = javaOperator;
        this.binaryOperator = binaryOperator;
    }

    @Override
    public Type returnType(Type leftType, Type rightType) {
        return commonType(leftType, rightType);
    }

    @Override
    public void generate(JavaSource source, ExpressionTranslator visitor, TypedNode left, TypedNode right) {
        Type commonType = commonType(left.getType(), right.getType());
        source.objectModel().startCall(SourceGenConstants.ROM_TO_NUMBER, true).startMethodCall(OBJECT_NAME + "." + binaryOperator.name(),
                METHOD_NAME);
        left.getNode().accept(visitor);
        source.separateArgument();
        right.getNode().accept(visitor);
        source.endCall().endCall().startCall(commonType.getNativeClass() + "Value", true).endCall();
    }

    protected Type commonType(Type leftType, Type rightType) {
        if (leftType == rightType && leftType == Type.LONG) {
            return Type.LONG;
        }
        return Type.DOUBLE;
    }
}