com.google.gwt.dev.jjs.ast.JDoubleLiteral.java Source code

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Here is the source code for com.google.gwt.dev.jjs.ast.JDoubleLiteral.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed 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 com.google.gwt.dev.jjs.ast;

import com.google.gwt.dev.jjs.SourceInfo;
import com.google.gwt.dev.jjs.SourceOrigin;

/**
 * Java double literal expression.
 */
public class JDoubleLiteral extends JValueLiteral {

    public static final JDoubleLiteral ZERO = new JDoubleLiteral(SourceOrigin.UNKNOWN, Double.longBitsToDouble(0L));

    public static JDoubleLiteral get(double value) {
        return isZero(value) ? ZERO : new JDoubleLiteral(SourceOrigin.UNKNOWN, value);
    }

    /**
     * Does this value match the exact 0 bit pattern? (This precludes
     * canonicalizing -0.0 as 0.0).
     */
    private static boolean isZero(double value) {
        return Double.doubleToRawLongBits(value) == 0L;
    }

    private final double value;

    public JDoubleLiteral(SourceInfo sourceInfo, double value) {
        super(sourceInfo);
        this.value = value;
    }

    @Override
    public JValueLiteral cloneFrom(JValueLiteral value) {
        Object valueObj = value.getValueObj();
        if (valueObj instanceof Character) {
            Character character = (Character) valueObj;
            return new JDoubleLiteral(value.getSourceInfo(), character.charValue());
        } else if (valueObj instanceof Number) {
            Number number = (Number) valueObj;
            return new JDoubleLiteral(value.getSourceInfo(), number.doubleValue());
        }
        return null;
    }

    public JType getType() {
        return JPrimitiveType.DOUBLE;
    }

    public double getValue() {
        return value;
    }

    @Override
    public Object getValueObj() {
        return new Double(value);
    }

    public void traverse(JVisitor visitor, Context ctx) {
        if (visitor.visit(this, ctx)) {
        }
        visitor.endVisit(this, ctx);
    }

    private Object readResolve() {
        return isZero(value) ? ZERO : this;
    }
}