public static final Type BOOLEAN = new Type("Z");
public static final Type DOUBLE = new Type("D");
public static final Type FLOAT = new Type("F");
+ public static final Type BYTE = new Type("B");
+ public static final Type CHAR = new Type("C");
+ public static final Type SHORT = new Type("S");
public static final Type.Object OBJECT = new Type.Object("java.lang.Object");
public static final Type.Object STRING = new Type.Object("java.lang.String");
public static final Type.Object DOUBLE_OBJECT = new Type.Object("java.lang.Double");
public static final Type.Object FLOAT_OBJECT = new Type.Object("java.lang.Float");
+ /** A zero element Type[] array (can be passed as the "args" param when a method takes no arguments */
public static final Type[] NO_ARGS = new Type[0];
final String descriptor;
- Type(String descriptor) { this.descriptor = descriptor; }
+ protected Type(String descriptor) { this.descriptor = descriptor; }
+ public static Type fromDescriptor(String descriptor) {
+ if(descriptor.equals("V")) return VOID;
+ if(descriptor.equals("I")) return INT;
+ if(descriptor.equals("J")) return LONG;
+ if(descriptor.equals("Z")) return BOOLEAN;
+ if(descriptor.equals("D")) return DOUBLE;
+ if(descriptor.equals("F")) return FLOAT;
+ if(descriptor.equals("B")) return BYTE;
+ if(descriptor.equals("C")) return CHAR;
+ if(descriptor.equals("S")) return SHORT;
+ if(descriptor.endsWith("[")) return new Type.Array(fromDescriptor(descriptor.substring(0, descriptor.indexOf('['))),
+ descriptor.length() - descriptor.indexOf('['));
+ if(Type.Object.validDescriptorString(descriptor)) return new Type.Object(descriptor);
+ return null;
+ }
+
+ /** Returns the Java descriptor string for this object ("I", or "Ljava/lang/String", "[[J", etc */
public final String getDescriptor() { return descriptor; }
public int hashCode() { return descriptor.hashCode(); }
public boolean equals(java.lang.Object o) { return o instanceof Type && ((Type)o).descriptor.equals(descriptor); }
+ /** Returns a one dimensional array type for the base type <i>base</i>
+ @param base The base type
+ @return A one dimensional array of the base type
+ */
public static Type arrayType(Type base) { return arrayType(base,1); }
- public static Type arrayType(Type base, int dim) {
- StringBuffer sb = new StringBuffer(base.descriptor.length() + dim);
- for(int i=0;i<dim;i++) sb.append("[");
- sb.append(base.descriptor);
- return new Type(sb.toString());
- }
-
+ /** Returns a <i>dim</i> dimensional array type for the base type <i>base</i>
+ @param base The base type
+ @param dim Number if dimensions
+ @return A one dimensional array of the base type
+ */
+ public static Type arrayType(Type base, int dim) { return new Type.Array(base, dim); }
+
+ public Type.Object asObject() { throw new RuntimeException("attempted to use "+this+" as a Type.Object, which it is not"); }
+ public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
+ public boolean isObject() { return false; }
+ public boolean isArray() { return false; }
+
+ /** Class representing Object types (any non-primitive type) */
public static class Object extends Type {
- public Object(String s) { super(_initHelper(s)); }
-
+ /** Create an Type.Object instance for the specified string. <i>s</i> can be a string in the form
+ "java.lang.String", "java/lang/String", or "Ljava/lang/String;".
+ @param s The type */
+ protected Object(String s) { super(_initHelper(s)); }
+ public Type.Object asObject() { return this; }
+ public boolean isObject() { return true; }
+
private static String _initHelper(String s) {
if(!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.','/') + ";";
if(!validDescriptorString(s)) throw new IllegalArgumentException("invalid descriptor string");
return s;
}
- public String[] components() {
+ String[] components() {
StringTokenizer st = new StringTokenizer(descriptor.substring(1,descriptor.length()-1),"/");
String[] a = new String[st.countTokens()];
for(int i=0;st.hasMoreTokens();i++) a[i] = st.nextToken();
return a;
}
- public String internalForm() { return descriptor.substring(1,descriptor.length()-1); }
+ String internalForm() { return descriptor.substring(1,descriptor.length()-1); }
- // FEATURE: Do a proper check here (invalid chars, etc)
static boolean validDescriptorString(String s) {
return s.startsWith("L") && s.endsWith(";");
}
}
+
+ public static class Array extends Object {
+ protected Array(Type t, int dim) { super(arrayify(t,dim)); }
+ public Type.Array asArray() { return this; }
+ public boolean isArray() { return true; }
+ private static String arrayify(Type t, int dim) {
+ StringBuffer sb = new StringBuffer(t.descriptor.length() + dim);
+ for(int i=0;i<dim;i++) sb.append("[");
+ sb.append(t.descriptor);
+ return sb.toString();
+ }
+ }
+
}