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/*
* This code was generated by ojc.
*/
/*
* RTReflClass.oj
*
* Oct 29, 1999 by Michiaki Tatsubori
*/
package examples.rtrefl;
import openjava.mop.*;
import openjava.ptree.*;
import openjava.syntax.*;
/**
* The class <code>RTReflClass</code> is a metaclass which
* provides hooks for runtime class metaobject.
* <p>
* All the fields in the class are hidden instead the readers and
* writers methods for fields are provided. Furthermore, accesses
* to fields of the class is to be replaced with these methods.
* Note that member accesses in its class body are not captured.
*/
public class RTReflClass extends OJClass
{
protected static String RTMETAOBJ_FIELD = "mt";
protected static Expression METAFIELD_ACCESS = new FieldAccess( RTMETAOBJ_FIELD );
protected static final String originalMethodName( String name )
{
return "org_" + name;
}
protected static final String fieldReaderName( String name )
{
return "read_" + name;
}
protected static final String fieldWriterName( String name )
{
return "write_" + name;
}
/** Overrides to translate definition */
public void translateDefinition()
throws MOPException
{
addInterface( openjava.mop.OJClass.forClass( RTMetaLevel.class ) );
OJMethod[] methods = getDeclaredMethods();
OJField[] fields = getDeclaredFields();
OJField rtmobj_field = new OJField( this, OJModifier.forModifier( OJModifier.PUBLIC ), openjava.mop.OJClass.forClass( RTMetaObject.class ), RTMETAOBJ_FIELD );
addField( rtmobj_field );
for (int i = 0; i < methods.length; ++i) {
OJModifier modif = methods[i].getModifiers();
if (modif.isPublic()) {
provideMethod( methods[i] );
}
}
for (int i = 0; i < fields.length; ++i) {
OJModifier modif = fields[i].getModifiers();
if (modif.isPublic()) {
provideField( fields[i] );
}
}
}
private void provideMethod( OJMethod method )
throws MOPException
{
System.err.println( "Providing a method : " + method.toString() );
OJMethod trapper = OJMethod.makePrototype( method );
method.setName( originalMethodName( method.getName() ) );
addMethod( trapper );
Expression trapexpr = generateTrappingMethodCall( trapper );
StatementList body = new StatementList();
OJClass retType = trapper.getReturnType();
if (retType == OJSystem.VOID) {
body.add( new ExpressionStatement( trapexpr ) );
} else {
Expression unwrapexpr = generateUnwrapping( retType, trapexpr );
body.add( new ReturnStatement( unwrapexpr ) );
}
trapper.setBody( body );
}
private static MethodCall generateTrappingMethodCall( OJMethod method )
throws MOPException
{
ExpressionList params = method.getParameterVariables();
OJClass[] paramTypes = method.getParameterTypes();
ExpressionList typeinfo_args = new ExpressionList();
ExpressionList args = new ExpressionList();
for (int i = 0; i < paramTypes.length; ++i) {
typeinfo_args.add( new ClassLiteral( paramTypes[i] ) );
args.add( generateWrapping( paramTypes[i], params.get( i ) ) );
}
Expression namearg = Literal.makeLiteral( originalMethodName( method.getName() ) );
Expression mrsld_typearg = new ArrayAllocationExpression( openjava.mop.OJClass.forClass( java.lang.Class.class ), new ExpressionList( null ), new ArrayInitializer( typeinfo_args ) );
Expression mrsld_arg = new ArrayAllocationExpression( openjava.mop.OJClass.forClass( java.lang.Object.class ), new ExpressionList( null ), new ArrayInitializer( args ) );
ExpressionList metaargs = new ExpressionList( namearg, mrsld_typearg, mrsld_arg );
return new MethodCall( METAFIELD_ACCESS, "trapMethodCall", metaargs );
}
private void provideField( OJField field )
throws MOPException
{
System.err.println( "Providing a field : " + field.toString() );
generateReaderMethod( field );
generateWriterMethod( field );
}
/**
* int read_l() {
* return ((Integer) mt.trapFieldRead("l")).intValue();
* }
*/
private void generateReaderMethod( OJField field )
throws MOPException
{
Expression metafld = new FieldAccess( RTMETAOBJ_FIELD );
ExpressionList args = new ExpressionList( Literal.makeLiteral( field.getName() ) );
Expression trapexpr = new MethodCall( METAFIELD_ACCESS, "trapFieldRead", args );
Expression unwrapping = generateUnwrapping( field.getType(), trapexpr );
OJMethod reader = new OJMethod( this, field.getModifiers(), field.getType(), fieldReaderName( field.getName() ), (OJClass[]) null, null, new StatementList( new ReturnStatement( unwrapping ) ) );
addMethod( reader );
}
/**
* int write_l(int rvalue) {
* mt.trapFieldWrite("l", new Integer(rvalue));
* return rvalue;
* }
*/
private void generateWriterMethod( OJField field )
throws MOPException
{
OJMethod writer = new OJMethod( this, field.getModifiers(), field.getType(), fieldWriterName( field.getName() ), new OJClass[]{ field.getType() }, null, null );
Expression param = writer.getParameterVariables().get( 0 );
ExpressionList args = new ExpressionList( Literal.makeLiteral( field.getName() ), generateWrapping( field.getType(), param ) );
Expression trapexpr = new MethodCall( METAFIELD_ACCESS, "trapFieldWrite", args );
StatementList body = new StatementList( new ExpressionStatement( trapexpr ), new ReturnStatement( param ) );
writer.setBody( body );
addMethod( writer );
}
/** new Integer(expr) for expr */
private static Expression generateWrapping( OJClass realType, Expression expr )
{
if (!realType.isPrimitive()) {
return expr;
}
OJClass wrapperType = realType.primitiveWrapper();
return new AllocationExpression( wrapperType, new ExpressionList( expr ) );
}
/** ((Integer) expr).intValue() for expr */
private static Expression generateUnwrapping( OJClass realType, Expression expr )
{
expr = new CastExpression( realType.primitiveWrapper(), expr );
if (!realType.isPrimitive()) {
return expr;
}
return new MethodCall( expr, realType.getName() + "Value", null );
}
/** Allows references to private fields */
public OJField resolveException( NoSuchMemberException e, String name )
throws NoSuchMemberException
{
try {
return getDeclaredField( name );
} catch ( NoSuchMemberException e2 ) {
}
return super.resolveException( e, name );
}
/** Overrides to expand fields to be read */
public Expression expandFieldRead( Environment env, FieldAccess expr )
{
if (expr.getName().equals( RTMETAOBJ_FIELD )) {
return expr;
}
Expression ref = expr.getReferenceExpr();
String name = fieldReaderName( expr.getName() );
Expression result;
if (ref != null) {
result = new MethodCall( ref, name, null );
} else {
result = new MethodCall( expr.getReferenceType(), name, null );
}
System.err.println( "Patch FR : " + expr + "\tto\t" + result );
return result;
}
/** Overrides to expand fields to be written */
public Expression expandFieldWrite( Environment env, AssignmentExpression expr )
{
FieldAccess fldac = (FieldAccess) expr.getLeft();
if (fldac.getName().equals( RTMETAOBJ_FIELD )) {
return expr;
}
ExpressionList args = new ExpressionList( expr.getRight() );
Expression ref = fldac.getReferenceExpr();
String name = fieldWriterName( fldac.getName() );
Expression result;
if (ref != null) {
result = new MethodCall( ref, name, args );
} else {
result = new MethodCall( fldac.getReferenceType(), name, args );
}
System.err.println( "Patch FW : " + expr + "\tto\t" + result );
return result;
}
public RTReflClass( openjava.mop.Environment oj_param0, openjava.mop.OJClass oj_param1, openjava.ptree.ClassDeclaration oj_param2 )
{
super( oj_param0, oj_param1, oj_param2 );
}
public RTReflClass( java.lang.Class oj_param0, openjava.mop.MetaInfo oj_param1 )
{
super( oj_param0, oj_param1 );
}
}
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