1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  import java.io.*;
57  import org.apache.bcel.util.ByteSequence;
58  
59  /*** 
60   * NEWARRAY -  Create new array of basic type (int, short, ...)
61   * <PRE>Stack: ..., count -> ..., arrayref</PRE>
62   * type must be one of T_INT, T_SHORT, ...
63   * 
64   * @version $Id: NEWARRAY.java,v 1.2 2002/08/07 18:01:32 mdahm Exp $
65   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
66   */
67  public class NEWARRAY extends Instruction
68    implements AllocationInstruction, ExceptionThrower, StackProducer {
69    private byte type;
70  
71    /***
72     * Empty constructor needed for the Class.newInstance() statement in
73     * Instruction.readInstruction(). Not to be used otherwise.
74     */
75    NEWARRAY() {}
76  
77    public NEWARRAY(byte type) {
78      super(org.apache.bcel.Constants.NEWARRAY, (short)2);
79      this.type = type;
80    }
81  
82    public NEWARRAY(BasicType type) {
83        this(type.getType());
84    }
85  
86    /***
87     * Dump instruction as byte code to stream out.
88     * @param out Output stream
89     */
90    public void dump(DataOutputStream out) throws IOException {
91      out.writeByte(opcode);
92      out.writeByte(type);
93    }
94  
95    /***
96     * @return numeric code for basic element type
97     */
98    public final byte getTypecode() { return type; }
99  
100   /***
101    * @return type of constructed array
102    */
103   public final Type getType() {
104     return new ArrayType(BasicType.getType(type), 1);
105   }
106 
107   /***
108    * @return mnemonic for instruction
109    */
110   public String toString(boolean verbose) {
111     return super.toString(verbose) + " " + org.apache.bcel.Constants.TYPE_NAMES[type];
112   }
113   /***
114    * Read needed data (e.g. index) from file.
115    */
116   protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
117   {
118     type   = bytes.readByte();
119     length = 2;
120   }
121 
122   public Class[] getExceptions() {
123     return new Class[] { org.apache.bcel.ExceptionConstants.NEGATIVE_ARRAY_SIZE_EXCEPTION };
124   }
125 
126   /***
127    * Call corresponding visitor method(s). The order is:
128    * Call visitor methods of implemented interfaces first, then
129    * call methods according to the class hierarchy in descending order,
130    * i.e., the most specific visitXXX() call comes last.
131    *
132    * @param v Visitor object
133    */
134   public void accept(Visitor v) {
135     v.visitAllocationInstruction(this);
136     v.visitExceptionThrower(this);
137     v.visitStackProducer(this);
138     v.visitNEWARRAY(this);
139   }
140 }
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