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");
+
+ 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");
- public static final Type.Object STRINGBUFFER = new Type.Object("java.lang.StringBuffer");
- public static final Type.Object INTEGER_OBJECT = new Type.Object("java.lang.Integer");
- 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");
+ public static final Type.Class OBJECT = new Type.Class("java.lang.Object");
+ public static final Type.Class STRING = new Type.Class("java.lang.String");
+ public static final Type.Class STRINGBUFFER = new Type.Class("java.lang.StringBuffer");
+ public static final Type.Class INTEGER_OBJECT = new Type.Class("java.lang.Integer");
+ public static final Type.Class DOUBLE_OBJECT = new Type.Class("java.lang.Double");
+ public static final Type.Class FLOAT_OBJECT = new Type.Class("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; }
-
- 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 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());
+ /** guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable */
+ public static Type instance(String d) {
+ Type ret = (Type)instances.get(d);
+ if (ret != null) return ret;
+ if (d.startsWith("[")) return new Type.Array(instance(d.substring(1)));
+ return new Type.Class(d);
}
-
- public static class Object extends Type {
- public Object(String s) { super(_initHelper(s)); }
-
+
+ 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.Array makeArray() { return (Type.Array)instance("["+descriptor); }
+
+ public Type.Ref asRef() { throw new RuntimeException("attempted to use "+this+" as a Type.Ref, which it is not"); }
+ public Type.Class asClass() { throw new RuntimeException("attempted to use "+this+" as a Type.Class, 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 isPrimitive() { return !isRef(); }
+ public boolean isRef() { return false; }
+ public boolean isClass() { 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);
+ }
+
+ public static class Ref extends Type {
+ protected Ref(String descriptor) { super(descriptor); }
+ protected Ref(String descriptor, String humanReadable) { super(descriptor, humanReadable); }
+ public Type.Ref asRef() { return this; }
+ public boolean isRef() { return true; }
+ }
+
+ public static class Class extends Type.Ref {
+ protected Class(String s) { super(_initHelper(s), _initHelper2(s)); }
+ public Type.Class asClass() { return this; }
+ public boolean isClass() { return true; }
+ 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('.','/') + ";";
- if(!validDescriptorString(s)) throw new IllegalArgumentException("invalid descriptor string");
+ if (!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.', '/') + ";";
return s;
}
-
- public String[] components() {
- StringTokenizer st = new StringTokenizer(descriptor.substring(1,descriptor.length()-1),"/");
+ 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;
}
-
- public 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 Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
+ public Field field(String name, Type type) { return new Field(name, type); }
+
+ public abstract class Member {
+ public final String name;
+ private Member(String name) { this.name = name; }
+ public Type.Class getDeclaringClass() { return Type.Class.this; }
+ public abstract String getDescriptor();
+ public boolean equals(Object o_) {
+ if(!(o_ instanceof Member)) return false;
+ Member o = (Member) o_;
+ return o.getDeclaringClass().equals(getDeclaringClass()) &&
+ o.name.equals(name) &&
+ o.getDescriptor().equals(getDescriptor());
+ }
+ public int hashCode() { return getDeclaringClass().hashCode() ^ name.hashCode() ^ getDescriptor().hashCode(); }
+ }
+
+ public class Field extends Member {
+ /** Create a reference to field <i>name</i> of class <i>c</i> with the type <i>t</i> */
+ public final Type type;
+ private Field(String name, Type t) { super(name); this.type = t; }
+ public String getDescriptor() { return name; }
+ }
+
+ public class Method extends Member {
+ final Type[] argTypes;
+ final Type returnType;
+ private Method(String name, Type returnType, Type[] argTypes) {
+ super(name);
+ this.argTypes = argTypes;
+ this.returnType = returnType;
+ }
+ public String getDescriptor() {
+ StringBuffer sb = new StringBuffer(argTypes.length*4);
+ sb.append("(");
+ for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
+ sb.append(")");
+ sb.append(returnType.getDescriptor());
+ return sb.toString();
+ }
}
+
}
+
+ public static class Array extends Type.Ref {
+ protected Array(Type t) { super("[" + t.getDescriptor(), t.toString() + "[]"); }
+ public Type.Array asArray() { return this; }
+ public boolean isArray() { return true; }
+ public int dimension() { return getDescriptor().lastIndexOf('['); }
+ }
+
}
projects / org.ibex.classgen.git / blobdiff