| /* |
| * 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 JType getType() { |
| return JPrimitiveType.DOUBLE; |
| } |
| |
| public double getValue() { |
| return value; |
| } |
| |
| @Override |
| public Object getValueObj() { |
| return new Double(value); |
| } |
| |
| @Override |
| public void traverse(JVisitor visitor, Context ctx) { |
| if (visitor.visit(this, ctx)) { |
| } |
| visitor.endVisit(this, ctx); |
| } |
| |
| private Object readResolve() { |
| return isZero(value) ? ZERO : this; |
| } |
| } |