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.Class OBJECT = new Type.Class("java.lang.Object");
23 public static final Type.Class STRING = new Type.Class("java.lang.String");
24 public static final Type.Class STRINGBUFFER = new Type.Class("java.lang.StringBuffer");
25 public static final Type.Class INTEGER_OBJECT = new Type.Class("java.lang.Integer");
26 public static final Type.Class DOUBLE_OBJECT = new Type.Class("java.lang.Double");
27 public static final Type.Class FLOAT_OBJECT = new Type.Class("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 instance(String d) {
34 Type ret = (Type)instances.get(d);
35 if (ret != null) return ret;
36 if (d.startsWith("[")) return new Type.Array(instance(d.substring(1)));
37 return new Type.Class(d);
40 public String toString() { return toString; }
41 public String debugToString() { return toString; }
42 public final String getDescriptor() { return descriptor; }
43 public int hashCode() { return descriptor.hashCode(); }
44 public boolean equals(java.lang.Object o) { return this==o; }
46 public Type.Array makeArray() { return (Type.Array)instance("["+descriptor); }
48 public Type.Ref asRef() { throw new RuntimeException("attempted to use "+this+" as a Type.Ref, which it is not"); }
49 public Type.Class asClass() { throw new RuntimeException("attempted to use "+this+" as a Type.Class, which it is not"); }
50 public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
51 public boolean isPrimitive() { return !isRef(); }
52 public boolean isRef() { return false; }
53 public boolean isClass() { return false; }
54 public boolean isArray() { return false; }
56 // Protected/Private //////////////////////////////////////////////////////////////////////////////
58 protected final String descriptor;
59 protected final String toString;
60 protected Type(String descriptor) { this(descriptor, descriptor); }
61 protected Type(String descriptor, String humanReadable) {
62 this.toString = humanReadable;
63 instances.put(this.descriptor = descriptor, this);
66 public static class Ref extends Type {
67 protected Ref(String descriptor) { super(descriptor); }
68 protected Ref(String descriptor, String humanReadable) { super(descriptor, humanReadable); }
69 public Type.Ref asRef() { return this; }
70 public boolean isRef() { return true; }
73 public static class Array extends Type.Ref {
74 protected Array(Type t) { super("[" + t.getDescriptor(), t.toString() + "[]"); }
75 public Type.Array asArray() { return this; }
76 public boolean isArray() { return true; }
77 public int dimension() { return getDescriptor().lastIndexOf('['); }
80 public static class Class extends Type.Ref {
81 protected Class(String s) { super(_initHelper(s), _initHelper2(s)); }
82 public Type.Class asClass() { return this; }
83 public boolean isClass() { return true; }
84 public String getShortName() { return toString.substring(toString.lastIndexOf('.')+1); }
85 String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
86 private static String _initHelper(String s) {
87 if (!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.', '/') + ";";
90 private static String _initHelper2(String s) {
91 if (s.startsWith("L") && s.endsWith(";")) s = s.substring(1, s.length()-1);
92 return s.replace('/', '.');
94 String[] components() {
95 StringTokenizer st = new StringTokenizer(descriptor.substring(1, descriptor.length()-1), "/");
96 String[] a = new String[st.countTokens()];
97 for(int i=0;st.hasMoreTokens();i++) a[i] = st.nextToken();
101 public Field field(String name, Type type) { return new Field(name, type); }
102 public Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
103 public Method method(String signature) {
104 // FEATURE: This parser is ugly but it works (and shouldn't be a problem) might want to clean it up though
105 String s = signature;
106 String name = s.startsWith("(") ? "" : s.substring(0, s.indexOf('('));
107 s = s.substring(s.indexOf('('));
108 int p = s.indexOf(')');
109 if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
110 String argsDesc = s.substring(1,p);
111 String retDesc = s.substring(p+1);
112 Type[] argsBuf = new Type[argsDesc.length()];
114 for(i=0,p=0;argsDesc.length() > 0;i++,p=0) {
115 while(p < argsDesc.length() && argsDesc.charAt(p) == '[') p++;
116 if(p == argsDesc.length()) throw new IllegalArgumentException("invalid method type descriptor");
117 if(argsDesc.charAt(p) == 'L') {
118 p = argsDesc.indexOf(';');
119 if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
121 argsBuf[i] = Type.instance(argsDesc.substring(0,p+1));
122 argsDesc = argsDesc.substring(p+1);
124 Type args[] = new Type[i];
125 System.arraycopy(argsBuf,0,args,0,i);
126 return method(name, Type.instance(retDesc), args);
129 public abstract class Member {
130 public final String name;
131 private Member(String name) { this.name = name; }
132 public Type.Class getDeclaringClass() { return Type.Class.this; }
133 public abstract String getDescriptor();
134 public boolean equals(Object o_) {
135 if(!(o_ instanceof Member)) return false;
136 Member o = (Member) o_;
137 return o.getDeclaringClass().equals(getDeclaringClass()) &&
138 o.name.equals(name) &&
139 o.getDescriptor().equals(getDescriptor());
141 public int hashCode() { return getDeclaringClass().hashCode() ^ name.hashCode() ^ getDescriptor().hashCode(); }
144 public class Field extends Member {
145 public final Type type;
146 private Field(String name, Type t) { super(name); this.type = t; }
147 public String getDescriptor() { return name; }
150 public class Method extends Member {
151 final Type[] argTypes;
152 public final Type returnType;
153 public Type getArgType(int i) { return argTypes[i]; }
154 public int getNumArgs() { return argTypes.length; }
155 public String debugToString() {
156 StringBuffer sb = new StringBuffer();
157 if (name.equals("<clinit>")) sb.append("static ");
159 if (name.equals("<init>"))
160 sb.append(Class.this.getShortName());
162 sb.append(returnType).append(" ").append(name);
164 for(int i=0; i<argTypes.length; i++)
165 sb.append((i==0?"":", ")+argTypes[i].debugToString());
168 return sb.toString();
170 private Method(String name, Type returnType, Type[] argTypes) {
172 this.argTypes = argTypes;
173 this.returnType = returnType;
175 public String getDescriptor() {
176 StringBuffer sb = new StringBuffer(argTypes.length*4);
178 for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
180 sb.append(returnType.getDescriptor());
181 return sb.toString();
186 // FEATURE: This probably isn't the best place for these
187 static String methodTypeDescriptor(Type[] argTypes, Type returnType) {
188 StringBuffer sb = new StringBuffer(argTypes.length*4);
190 for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
192 sb.append(returnType.getDescriptor());
193 return sb.toString();