1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Licensed to the Apache Software Foundation (ASF) under one or more 6 * contributor license agreements. See the NOTICE file distributed with 7 * this work for additional information regarding copyright ownership. 8 * The ASF licenses this file to You under the Apache License, Version 2.0 9 * (the "License"); you may not use this file except in compliance with 10 * the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.bcel.internal.generic; 22 23 /** 24 * DCONST - Push 0.0 or 1.0, other values cause an exception 25 * 26 * <PRE>Stack: ... -> ..., </PRE> 27 * 28 * @version $Id: DCONST.java 1747278 2016-06-07 17:28:43Z britter $ 29 */ 30 public class DCONST extends Instruction implements ConstantPushInstruction { 31 32 private double value; 33 34 35 /** 36 * Empty constructor needed for the Class.newInstance() statement in 37 * Instruction.readInstruction(). Not to be used otherwise. 38 */ 39 DCONST() { 40 } 41 42 43 public DCONST(final double f) { 44 super(com.sun.org.apache.bcel.internal.Const.DCONST_0, (short) 1); 45 if (f == 0.0) { 46 super.setOpcode(com.sun.org.apache.bcel.internal.Const.DCONST_0); 47 } else if (f == 1.0) { 48 super.setOpcode(com.sun.org.apache.bcel.internal.Const.DCONST_1); 49 } else { 50 throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f); 51 } 52 value = f; 53 } 54 55 56 @Override 57 public Number getValue() { 58 return new Double(value); 59 } 60 61 62 /** @return Type.DOUBLE 63 */ 64 @Override 65 public Type getType( final ConstantPoolGen cp ) { 66 return Type.DOUBLE; 67 } 68 69 70 /** 71 * Call corresponding visitor method(s). The order is: 72 * Call visitor methods of implemented interfaces first, then 73 * call methods according to the class hierarchy in descending order, 74 * i.e., the most specific visitXXX() call comes last. 75 * 76 * @param v Visitor object 77 */ 78 @Override 79 public void accept( final Visitor v ) { 80 v.visitPushInstruction(this); 81 v.visitStackProducer(this); 82 v.visitTypedInstruction(this); 83 v.visitConstantPushInstruction(this); 84 v.visitDCONST(this); 85 } 86 }