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> 024 * Stack: ... -> ..., 025 * </PRE> 026 * 027 */ 028public class DCONST extends Instruction implements ConstantPushInstruction { 029 030 private double value; 031 032 /** 033 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 034 */ 035 DCONST() { 036 } 037 038 public DCONST(final double f) { 039 super(org.apache.bcel.Const.DCONST_0, (short) 1); 040 if (f == 0.0) { 041 super.setOpcode(org.apache.bcel.Const.DCONST_0); 042 } else if (f == 1.0) { 043 super.setOpcode(org.apache.bcel.Const.DCONST_1); 044 } else { 045 throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f); 046 } 047 value = f; 048 } 049 050 /** 051 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call 052 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last. 053 * 054 * @param v Visitor object 055 */ 056 @Override 057 public void accept(final Visitor v) { 058 v.visitPushInstruction(this); 059 v.visitStackProducer(this); 060 v.visitTypedInstruction(this); 061 v.visitConstantPushInstruction(this); 062 v.visitDCONST(this); 063 } 064 065 /** 066 * @return Type.DOUBLE 067 */ 068 @Override 069 public Type getType(final ConstantPoolGen cp) { 070 return Type.DOUBLE; 071 } 072 073 @Override 074 public Number getValue() { 075 return Double.valueOf(value); 076 } 077}