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InterSuperFixerVisitor.java

/* *******************************************************************
 * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *     PARC     initial implementation 
 * ******************************************************************/


package org.aspectj.ajdt.internal.compiler.ast;

import org.aspectj.ajdt.internal.compiler.lookup.EclipseFactory;
import org.aspectj.ajdt.internal.compiler.lookup.EclipseSourceLocation;
import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.Expression;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.FieldReference;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.SuperReference;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeBinding;

/**
 * Walks the body of inter-type declarations and replaces SuperReference with InterSuperReference
 * 
 * @author Jim Hugunin
 */

00037 public class InterSuperFixerVisitor extends ASTVisitor {
      InterTypeDeclaration dec;
      ReferenceBinding onType;
      TypeBinding superType;
      private int depthCounter = 0; // Keeps track of whether we are inside any nested local type declarations

      EclipseFactory world; 
      public InterSuperFixerVisitor(InterTypeDeclaration dec, EclipseFactory world, Scope scope) {
            this.dec = dec;
            this.onType = dec.onTypeBinding;
            this.world = world;
            // AMC with the java 5 compiler the superclass() of an interface is object,
            // not a parent interface (if one exists)
            if (onType.isInterface() && onType.superInterfaces().length == 1) {
                  superType=onType.superInterfaces()[0];
            } else if (onType.superclass() != null) {
                  superType = onType.superclass();
            } else if (onType.superInterfaces() == null || onType.superInterfaces().length == 0) {
                  superType = scope.getJavaLangObject();
            } else if (onType.superInterfaces().length == 1) {
                  superType = onType.superInterfaces()[0];
            } else {
                  superType = null;
            }
      }

      public void endVisit(FieldReference ref, BlockScope scope) {
            ref.receiver = fixReceiver(ref.receiver, scope);
      }
      public void endVisit(MessageSend send, BlockScope scope) {
            send.receiver = fixReceiver(send.receiver, scope);
      }
      
      
      public boolean visit(TypeDeclaration localTypeDeclaration, BlockScope scope) {
            depthCounter++;
            return super.visit(localTypeDeclaration, scope);
      }

      public void endVisit(TypeDeclaration localTypeDeclaration,BlockScope scope) {
            depthCounter--;
      }     

      private Expression fixReceiver(Expression expression, BlockScope scope) {
            if (depthCounter!=0) return expression; // Don't mess with super calls down in nested local type declarations (pr90143)
            if (expression instanceof SuperReference) {
                  SuperReference superRef = (SuperReference) expression;
                  if (superType == null) {
                        ISourceLocation location =
                              new EclipseSourceLocation(scope.problemReporter().referenceContext.compilationResult(),
                                                            expression.sourceStart, expression.sourceEnd);
                        
                        world.showMessage(IMessage.ERROR, "multiple supertypes for this interface", location, null);
                        dec.ignoreFurtherInvestigation = true;
                  }
                  //FIXME ??? note error
                  expression = new InterSuperReference(superRef, superType);  
            }
            return expression;
      }
      


}

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