Values


1   /***
2    * Values.java
3    *
4    * Description: SWF Action Code instruction opcode constants
5    */
6   
7   /* J_LZ_COPYRIGHT_BEGIN *******************************************************
8   * Copyright 2001-2004 Laszlo Systems, Inc.  All Rights Reserved.              *
9   * Use is subject to license terms.                                            *
10  * J_LZ_COPYRIGHT_END *********************************************************/
11  
12  package org.openlaszlo.sc;
13  import java.io.*;
14  
15  public class Values {
16    /***
17     * These do double duty as identifiers, and as the typecodes
18     * that are used by PUSH.
19     */
20    public static class PushTypes {
21      public static final byte String = 0;
22      public static final byte Float = 1;
23      public static final byte Null = 2;
24      public static final byte Undefined = 3;
25      public static final byte Register = 4;
26      public static final byte Boolean = 5;
27      public static final byte Integer = 7;
28      public static final byte Double = 6;
29      public static final byte CONSTANT_INDEX8 = 8;
30      public static final byte CONSTANT_INDEX16 = 9;
31    }
32  
33    // TODO: [2004-03-24 ptw] Generalize to any number of registers
34    public static Value r0 = Value.make("r:0", PushTypes.Register, (byte)0);
35    public static Value r1 = Value.make("r:1", PushTypes.Register, (byte)1);
36    public static Value r2 = Value.make("r:2", PushTypes.Register, (byte)2);
37    public static Value r3 = Value.make("r:3", PushTypes.Register, (byte)3);
38  
39    public static Value Register(int n) {
40      switch (n) {
41        case 0:
42          return r0;
43        case 1:
44          return r1;
45        case 2:
46          return r2;
47        case 3:
48          return r3;
49        default:
50          return Value.make("r:" + n, PushTypes.Register, (byte)n);
51      }
52    }
53  
54    public static boolean isRegister(Object   v) {
55      return v instanceof Value && ((Value)v).type == PushTypes.Register;
56    }
57  
58    public static boolean isInteger(Object   v) {
59      return v instanceof Number   && ((Number  )v).intValue() == ((Number  )v).doubleValue();
60    }
61  
62    /***
63     * Runtime Types
64     */
65  
66    public static class Value implements Serializable {
67      public String   name;
68      public byte type;
69  
70      public static Value make(String   name, byte type) {
71        return new Value(name, type);
72      }
73  
74      public static Value make(String   name, byte type, byte value) {
75        return new ParameterizedValue(name, type, value);
76      }
77  
78      private Value(String   name, byte type) {
79        this.name = name.intern();
80        this.type = type;
81      }
82  
83      public String   toString() {
84        return this.name;
85      }
86  
87      public Object   readResolve() throws ObjectStreamException {
88          switch (this.type) {
89          case PushTypes.Undefined:
90              return Values.Undefined;
91          case PushTypes.Null:
92              return Values.Null;
93          default:
94              return this;
95          }
96      }
97    }
98  
99    public static class ParameterizedValue extends Value {
100     public byte value;
101 
102     private ParameterizedValue(String   name, byte type, byte value) {
103       super(name, type);
104       this.value = value;
105     }
106 
107     public Object   readResolve() throws ObjectStreamException {
108         switch (this.type) {
109         case PushTypes.Boolean:
110             return this.value == 0 ? Values.False : Values.True;
111         case PushTypes.Register:
112             return Values.Register(this.value);
113         default:
114             return super.readResolve();
115         }
116     }
117   }
118 
119   public static Value True = Value.make("TRUE", PushTypes.Boolean, (byte)1);
120   public static Value False = Value.make("FALSE", PushTypes.Boolean, (byte)0);
121   public static Value Undefined = Value.make("UNDEF", PushTypes.Undefined);
122   public static Value Null = Value.make("NULL", PushTypes.Null);
123 
124   // Integers are represented as instances of Long
125 
126   // Strings are represented as instances of String
127 }
128 
129
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