001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020/** 021 * DCONST - Push 0.0 or 1.0, other values cause an exception 022 * 023 * <PRE>Stack: ... -> ..., </PRE> 024 * 025 * @version $Id: DCONST.java 1747278 2016-06-07 17:28:43Z britter $ 026 */ 027public class DCONST extends Instruction implements ConstantPushInstruction { 028 029 private double value; 030 031 032 /** 033 * Empty constructor needed for the Class.newInstance() statement in 034 * Instruction.readInstruction(). Not to be used otherwise. 035 */ 036 DCONST() { 037 } 038 039 040 public DCONST(final double f) { 041 super(org.apache.bcel.Const.DCONST_0, (short) 1); 042 if (f == 0.0) { 043 super.setOpcode(org.apache.bcel.Const.DCONST_0); 044 } else if (f == 1.0) { 045 super.setOpcode(org.apache.bcel.Const.DCONST_1); 046 } else { 047 throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f); 048 } 049 value = f; 050 } 051 052 053 @Override 054 public Number getValue() { 055 return new Double(value); 056 } 057 058 059 /** @return Type.DOUBLE 060 */ 061 @Override 062 public Type getType( final ConstantPoolGen cp ) { 063 return Type.DOUBLE; 064 } 065 066 067 /** 068 * Call corresponding visitor method(s). The order is: 069 * Call visitor methods of implemented interfaces first, then 070 * call methods according to the class hierarchy in descending order, 071 * i.e., the most specific visitXXX() call comes last. 072 * 073 * @param v Visitor object 074 */ 075 @Override 076 public void accept( final Visitor v ) { 077 v.visitPushInstruction(this); 078 v.visitStackProducer(this); 079 v.visitTypedInstruction(this); 080 v.visitConstantPushInstruction(this); 081 v.visitDCONST(this); 082 } 083}