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Java > Open Source Codes > org > apache > bcel > generic > BIPUSH


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 import java.io.DataOutputStream JavaDoc;
20 import java.io.IOException JavaDoc;
21 import org.apache.bcel.util.ByteSequence;
22
23 /**
24  * BIPUSH - Push byte on stack
25  *
26  * <PRE>Stack: ... -&gt; ..., value</PRE>
27  *
28  * @version $Id: BIPUSH.java 386056 2006-03-15 11:31:56Z tcurdt $
29  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
30  */
31 public class BIPUSH extends Instruction implements ConstantPushInstruction {
32
33     private byte b;
34
35
36     /**
37      * Empty constructor needed for the Class.newInstance() statement in
38      * Instruction.readInstruction(). Not to be used otherwise.
39      */
40     BIPUSH() {
41     }
42
43
44     /** Push byte on stack
45      */
46     public BIPUSH(byte b) {
47         super(org.apache.bcel.Constants.BIPUSH, (short) 2);
48         this.b = b;
49     }
50
51
52     /**
53      * Dump instruction as byte code to stream out.
54      */
55     public void dump( DataOutputStream JavaDoc out ) throws IOException JavaDoc {
56         super.dump(out);
57         out.writeByte(b);
58     }
59
60
61     /**
62      * @return mnemonic for instruction
63      */
64     public String JavaDoc toString( boolean verbose ) {
65         return super.toString(verbose) + " " + b;
66     }
67
68
69     /**
70      * Read needed data (e.g. index) from file.
71      */
72     protected void initFromFile( ByteSequence bytes, boolean wide ) throws IOException JavaDoc {
73         length = 2;
74         b = bytes.readByte();
75     }
76
77
78     public Number JavaDoc getValue() {
79         return new Integer JavaDoc(b);
80     }
81
82
83     /** @return Type.BYTE
84      */
85     public Type getType( ConstantPoolGen cp ) {
86         return Type.BYTE;
87     }
88
89
90     /**
91      * Call corresponding visitor method(s). The order is:
92      * Call visitor methods of implemented interfaces first, then
93      * call methods according to the class hierarchy in descending order,
94      * i.e., the most specific visitXXX() call comes last.
95      *
96      * @param v Visitor object
97      */
98     public void accept( Visitor v ) {
99         v.visitPushInstruction(this);
100         v.visitStackProducer(this);
101         v.visitTypedInstruction(this);
102         v.visitConstantPushInstruction(this);
103         v.visitBIPUSH(this);
104     }
105 }
106
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