package org.ibex.classgen;
import java.util.StringTokenizer;
+import java.util.Hashtable;
public class Type {
- public static final Type VOID = new Type("V");
- public static final Type INT = new Type("I");
- public static final Type LONG = new Type("J");
- 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");
+
+ private static Hashtable instances = new Hashtable(); // this has to appear at the top of the file
+
+ // Public API //////////////////////////////////////////////////////////////////////////////
+
+ public static final Type VOID = new Type("V", "void");
+ public static final Type INT = new Type("I", "int");
+ public static final Type LONG = new Type("J", "long");
+ public static final Type BOOLEAN = new Type("Z", "boolean");
+ public static final Type DOUBLE = new Type("D", "double");
+ public static final Type FLOAT = new Type("F", "float");
+ public static final Type BYTE = new Type("B", "byte");
+ public static final Type CHAR = new Type("C", "char");
+ public static final Type SHORT = new Type("S", "short");
public static final Type.Object OBJECT = new Type.Object("java.lang.Object");
public static final Type.Object STRING = new Type.Object("java.lang.String");
/** 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;
-
- public String humanReadable() {
- 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";
- throw new Error("confounded by Type("+descriptor+")");
- }
-
- protected Type(String descriptor) { this.descriptor = descriptor; }
-
+ /** guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable */
public static Type fromDescriptor(String d) {
- if (d.equals("V")) return VOID;
- if (d.equals("I")) return INT;
- if (d.equals("J")) return LONG;
- if (d.equals("Z")) return BOOLEAN;
- if (d.equals("D")) return DOUBLE;
- if (d.equals("F")) return FLOAT;
- if (d.equals("B")) return BYTE;
- if (d.equals("C")) return CHAR;
- if (d.equals("S")) return SHORT;
- if (d.endsWith("["))
- return new Type.Array(fromDescriptor(d.substring(0, d.indexOf('['))),
- d.length() - d.indexOf('['));
+ Type ret = (Type)instances.get(d);
+ if (ret != null) return ret;
+ if (d.endsWith("[")) return new Type.Array(fromDescriptor(d.substring(d.length()-1)));
return new Type.Object(d);
}
-
- /** 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); }
-
- public String toString() { return getDescriptor(); }
+
+ public String toString() { return toString; }
+ public final String getDescriptor() { return descriptor; }
+ public int hashCode() { return descriptor.hashCode(); }
+ public boolean equals(java.lang.Object o) { return this==o; }
+
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 Type.Array makeArray() { return new Type.Array(this); }
- public Type.Array makeArray(int dim) { return new Type.Array(this, dim); }
- public boolean isObject() { return false; }
- public boolean isArray() { return false; }
+ public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
+ public Type.Array makeArray() { return new Type.Array(this); }
+ public boolean isObject() { return false; }
+ public boolean isArray() { return false; }
+
+ // Protected/Private //////////////////////////////////////////////////////////////////////////////
+
+ protected final String descriptor;
+ protected final String toString;
+ protected Type(String descriptor) { this(descriptor, descriptor); }
+ protected Type(String descriptor, String humanReadable) {
+ this.toString = humanReadable;
+ instances.put(this.descriptor = descriptor, this);
+ }
/** Class representing Object types (any non-primitive type) */
public static class Object extends Type {
- protected Object(String s) { super(_initHelper(s)); }
+ protected Object(String s) { super(_initHelper(s), _initHelper2(s)); }
+ protected Object(String descriptor, String hr) { super(_initHelper(descriptor), _initHelper2(hr)); }
public Type.Object asObject() { return this; }
public boolean isObject() { return true; }
- public String humanReadable() { return internalForm().replace('/', '.'); }
- public String getShortName() {
- String hr = humanReadable();
- return hr.substring(hr.lastIndexOf('.')+1);
- }
-
+ public String getShortName() { return toString.substring(toString.lastIndexOf('.')+1); }
+ String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
private static String _initHelper(String s) {
if (!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.', '/') + ";";
return s;
}
-
+ private static String _initHelper2(String s) {
+ if (s.startsWith("L") && s.endsWith(";")) s = s.substring(1, s.length()-1);
+ return s.replace('/', '.');
+ }
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;
}
-
- String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
}
- public static class Array extends Object {
- private int dim;
- protected Array(Type t) { super(_initHelper(t, 1)); this.dim = 1; }
- protected Array(Type t, int dim) { super(_initHelper(t, dim)); this.dim = dim; }
+ public static class Array extends Type.Object {
+ protected Array(Type t) { super(t.getDescriptor() + "[", t.toString() + "[]"); }
public Type.Array asArray() { return this; }
public boolean isArray() { return true; }
- public String humanReadable() {
- String ret = super.internalForm().replace('/', '.');
- for(int i=0; i<dim; i++) ret += "[]";
- return ret;
- }
- String internalForm() { throw new Error("Type.Array does not have an internalForm()"); }
+ public int dimension() { return descriptor.length() - descriptor.indexOf('['); }
String[] components() { throw new Error("Type.Array does not have components()"); }
- private static String _initHelper(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();
- }
}
}
projects / org.ibex.classgen.git / commitdiff