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 STRING = new Type.Object("java.lang.String");
- public static final Type[] NO_ARGS = new Type[0];
-
- String descriptor;
+
+ 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");
- Type() { }
- Type(String descriptor) { this.descriptor = descriptor; }
+ 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");
- public final String getDescriptor() { return descriptor; }
- public int hashCode() { return descriptor.hashCode(); }
- public boolean equals(Object o) { return o instanceof Type && ((Type)o).descriptor.equals(descriptor); }
+ /** 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];
- 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) {
- if(!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.','/') + ";";
- if(!validDescriptorString(s)) throw new IllegalArgumentException("invalid descriptor string");
- descriptor = s;
+
+ public String toString() { return toString; }
+ public String debugToString() { 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.Array makeArray(int i) { return i==0 ? (Type.Array)this : makeArray().makeArray(i-1); }
+
+ 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 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('['); }
+ public Type getElementType() { return Type.instance(getDescriptor().substring(0, getDescriptor().length()-1)); }
+ }
+
+ 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('.', '/') + ";";
+ return s;
+ }
+ private static String _initHelper2(String s) {
+ if (s.startsWith("L") && s.endsWith(";")) s = s.substring(1, s.length()-1);
+ return s.replace('/', '.');
}
-
- public String[] components() {
- StringTokenizer st = new StringTokenizer(descriptor.substring(1,descriptor.length()-1),"/");
+ 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)
- public boolean validDescriptorString(String s) {
- return s.startsWith("L") && s.endsWith(";");
+
+ public Field field(String name, Type type) { return new Field(name, type); }
+ public Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
+ public Method method(String signature) {
+ // FEATURE: This parser is ugly but it works (and shouldn't be a problem) might want to clean it up though
+ String s = signature;
+ String name = s.startsWith("(") ? "" : s.substring(0, s.indexOf('('));
+ s = s.substring(s.indexOf('('));
+ int p = s.indexOf(')');
+ if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
+ String argsDesc = s.substring(1,p);
+ String retDesc = s.substring(p+1);
+ Type[] argsBuf = new Type[argsDesc.length()];
+ int i;
+ for(i=0,p=0;argsDesc.length() > 0;i++,p=0) {
+ while(p < argsDesc.length() && argsDesc.charAt(p) == '[') p++;
+ if(p == argsDesc.length()) throw new IllegalArgumentException("invalid method type descriptor");
+ if(argsDesc.charAt(p) == 'L') {
+ p = argsDesc.indexOf(';');
+ if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
+ }
+ argsBuf[i] = Type.instance(argsDesc.substring(0,p+1));
+ argsDesc = argsDesc.substring(p+1);
+ }
+ Type args[] = new Type[i];
+ System.arraycopy(argsBuf,0,args,0,i);
+ return method(name, Type.instance(retDesc), args);
+ }
+
+ 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 {
+ public final Type type;
+ private Field(String name, Type t) { super(name); this.type = t; }
+ public String getDescriptor() { return name; }
+ public Type getType() { return type; }
+ }
+
+ public class Method extends Member {
+ final Type[] argTypes;
+ public final Type returnType;
+ public Type getArgType(int i) { return argTypes[i]; }
+ public int getNumArgs() { return argTypes.length; }
+ public Type getReturnType() { return returnType; }
+ public String debugToString() {
+ StringBuffer sb = new StringBuffer();
+ if (name.equals("<clinit>")) sb.append("static ");
+ else {
+ if (name.equals("<init>"))
+ sb.append(Class.this.getShortName());
+ else
+ sb.append(returnType).append(" ").append(name);
+ sb.append("(");
+ for(int i=0; i<argTypes.length; i++)
+ sb.append((i==0?"":", ")+argTypes[i].debugToString());
+ sb.append(") ");
+ }
+ return sb.toString();
+ }
+ 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();
+ }
+ }
+ }
+
+ // FEATURE: This probably isn't the best place for these
+ static String methodTypeDescriptor(Type[] argTypes, Type returnType) {
+ 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();
+ }
+
}
projects / org.ibex.classgen.git / blobdiff