1 package org.ibex.classgen;
3 import java.util.StringTokenizer;
4 import java.util.Hashtable;
8 private static Hashtable instances = new Hashtable(); // this has to appear at the top of the file
10 // Public API //////////////////////////////////////////////////////////////////////////////
12 public static final Type VOID = new Type("V", "void");
13 public static final Type INT = new Type("I", "int");
14 public static final Type LONG = new Type("J", "long");
15 public static final Type BOOLEAN = new Type("Z", "boolean");
16 public static final Type DOUBLE = new Type("D", "double");
17 public static final Type FLOAT = new Type("F", "float");
18 public static final Type BYTE = new Type("B", "byte");
19 public static final Type CHAR = new Type("C", "char");
20 public static final Type SHORT = new Type("S", "short");
22 public static final Type.Object OBJECT = new Type.Object("java.lang.Object");
23 public static final Type.Object STRING = new Type.Object("java.lang.String");
24 public static final Type.Object STRINGBUFFER = new Type.Object("java.lang.StringBuffer");
25 public static final Type.Object INTEGER_OBJECT = new Type.Object("java.lang.Integer");
26 public static final Type.Object DOUBLE_OBJECT = new Type.Object("java.lang.Double");
27 public static final Type.Object FLOAT_OBJECT = new Type.Object("java.lang.Float");
29 /** A zero element Type[] array (can be passed as the "args" param when a method takes no arguments */
30 public static final Type[] NO_ARGS = new Type[0];
32 /** guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable */
33 public static Type fromDescriptor(String d) {
34 Type ret = (Type)instances.get(d);
35 if (ret != null) return ret;
36 if (d.endsWith("[")) return new Type.Array(fromDescriptor(d.substring(d.length()-1)));
37 return new Type.Object(d);
40 public String toString() { return toString; }
41 public final String getDescriptor() { return descriptor; }
42 public int hashCode() { return descriptor.hashCode(); }
43 public boolean equals(java.lang.Object o) { return this==o; }
45 public Type.Object asObject() { throw new RuntimeException("attempted to use "+this+" as a Type.Object, which it is not"); }
46 public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
47 public Type.Array makeArray() { return new Type.Array(this); }
48 public boolean isObject() { return false; }
49 public boolean isArray() { return false; }
51 // Protected/Private //////////////////////////////////////////////////////////////////////////////
53 protected final String descriptor;
54 protected final String toString;
55 protected Type(String descriptor) { this(descriptor, descriptor); }
56 protected Type(String descriptor, String humanReadable) {
57 this.toString = humanReadable;
58 instances.put(this.descriptor = descriptor, this);
61 /** Class representing Object types (any non-primitive type) */
62 public static class Object extends Type {
63 protected Object(String s) { super(_initHelper(s), _initHelper2(s)); }
64 protected Object(String descriptor, String hr) { super(_initHelper(descriptor), _initHelper2(hr)); }
65 public Type.Object asObject() { return this; }
66 public boolean isObject() { return true; }
67 public String getShortName() { return toString.substring(toString.lastIndexOf('.')+1); }
68 String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
69 private static String _initHelper(String s) {
70 if (!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.', '/') + ";";
73 private static String _initHelper2(String s) {
74 if (s.startsWith("L") && s.endsWith(";")) s = s.substring(1, s.length()-1);
75 return s.replace('/', '.');
77 String[] components() {
78 StringTokenizer st = new StringTokenizer(descriptor.substring(1, descriptor.length()-1), "/");
79 String[] a = new String[st.countTokens()];
80 for(int i=0;st.hasMoreTokens();i++) a[i] = st.nextToken();
85 public static class Array extends Type.Object {
86 protected Array(Type t) { super(t.getDescriptor() + "[", t.toString() + "[]"); }
87 public Type.Array asArray() { return this; }
88 public boolean isArray() { return true; }
89 public int dimension() { return descriptor.length() - descriptor.indexOf('['); }
90 String[] components() { throw new Error("Type.Array does not have components()"); }