X-Git-Url: http://git.megacz.com/?p=org.ibex.classgen.git;a=blobdiff_plain;f=src%2Forg%2Fibex%2Fclassgen%2FType.java;h=7445f9c60acd53a03d5ed818be8d8e9c679c353b;hp=ec5a30a83363075e43743f2a177293bfe7080108;hb=069115fd4de6720de0a4a1ee37f05fec438fc325;hpb=30a333241756f2eb395336ffbdb0038000b0bb56

diff --git a/src/org/ibex/classgen/Type.java b/src/org/ibex/classgen/Type.java
index ec5a30a..7445f9c 100644
--- a/src/org/ibex/classgen/Type.java
+++ b/src/org/ibex/classgen/Type.java
@@ -1,92 +1,200 @@
 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");
-    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 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(Type.Object.validDescriptorString(descriptor)) return new Type.Object(descriptor);
-        return null;
+    /** 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);
     }
-        
-    /** 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); }
-    /** 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) {
-        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());
+
+    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);
     }
-    
-    /** Class representing Objec types (any non-primitive type) */
-    public static class Object extends Type {
-        /** 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 */
-        public Object(String s) { super(_initHelper(s)); }
-        
+
+    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('.','/') + ";";
-            if(!validDescriptorString(s)) throw new IllegalArgumentException("invalid descriptor string");
+            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),"/");
+            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); }
-        
-        static 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();
+    }
+
 }