1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel.generic; 19 20 /** 21 * DCONST - Push 0.0 or 1.0, other values cause an exception 22 * 23 * <PRE>Stack: ... -> ..., </PRE> 24 * 25 * @version $Id$ 26 */ 27 public class DCONST extends Instruction implements ConstantPushInstruction { 28 29 private double value; 30 31 32 /** 33 * Empty constructor needed for Instruction.readInstruction. 34 * Not to be used otherwise. 35 */ DCONST()36 DCONST() { 37 } 38 39 DCONST(final double f)40 public DCONST(final double f) { 41 super(org.apache.bcel.Const.DCONST_0, (short) 1); 42 if (f == 0.0) { 43 super.setOpcode(org.apache.bcel.Const.DCONST_0); 44 } else if (f == 1.0) { 45 super.setOpcode(org.apache.bcel.Const.DCONST_1); 46 } else { 47 throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f); 48 } 49 value = f; 50 } 51 52 53 @Override getValue()54 public Number getValue() { 55 return new Double(value); 56 } 57 58 59 /** @return Type.DOUBLE 60 */ 61 @Override getType( final ConstantPoolGen cp )62 public Type getType( final ConstantPoolGen cp ) { 63 return Type.DOUBLE; 64 } 65 66 67 /** 68 * Call corresponding visitor method(s). The order is: 69 * Call visitor methods of implemented interfaces first, then 70 * call methods according to the class hierarchy in descending order, 71 * i.e., the most specific visitXXX() call comes last. 72 * 73 * @param v Visitor object 74 */ 75 @Override accept( final Visitor v )76 public void accept( final Visitor v ) { 77 v.visitPushInstruction(this); 78 v.visitStackProducer(this); 79 v.visitTypedInstruction(this); 80 v.visitConstantPushInstruction(this); 81 v.visitDCONST(this); 82 } 83 } 84