/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpdt.internal.compiler.lookup;

import java.util.ArrayList;

import net.sourceforge.phpdt.core.compiler.CharOperation;
import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
import net.sourceforge.phpdt.internal.compiler.util.CompoundNameVector;
import net.sourceforge.phpdt.internal.compiler.util.HashtableOfObject;
import net.sourceforge.phpdt.internal.compiler.util.HashtableOfType;
import net.sourceforge.phpdt.internal.compiler.util.ObjectVector;
import net.sourceforge.phpdt.internal.compiler.util.SimpleNameVector;
import net.sourceforge.phpeclipse.internal.compiler.ast.CompilationUnitDeclaration;
import net.sourceforge.phpeclipse.internal.compiler.ast.ImportReference;
import net.sourceforge.phpeclipse.internal.compiler.ast.TypeDeclaration;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IPath;

public class CompilationUnitScope extends Scope {

  public LookupEnvironment environment;
  public CompilationUnitDeclaration referenceContext;
  public char[][] currentPackageName;
  public PackageBinding fPackage;
  public ImportBinding[] imports;

  public SourceTypeBinding[] topLevelTypes;

  private CompoundNameVector qualifiedReferences;
  private SimpleNameVector simpleNameReferences;
  private ObjectVector referencedTypes;

  HashtableOfType constantPoolNameUsage;
  public HashtableOfObject resolvedSingeTypeImports;

  public CompilationUnitScope(CompilationUnitDeclaration unit, LookupEnvironment environment) {
    super(COMPILATION_UNIT_SCOPE, null);
    this.environment = environment;
    this.referenceContext = unit;
    unit.scope = this;
//    this.currentPackageName = unit.currentPackage == null ? CharOperation.NO_CHAR_CHAR : unit.currentPackage.tokens;
    this.currentPackageName = null; 
    //	if (environment.options.produceReferenceInfo) {
    //		this.qualifiedReferences = new CompoundNameVector();
    //		this.simpleNameReferences = new SimpleNameVector();
    //		this.referencedTypes = new ObjectVector();
    //	} else {
    this.qualifiedReferences = null; // used to test if dependencies should be recorded
    this.simpleNameReferences = null;
    this.referencedTypes = null;
    //	}
  }
  void buildFieldsAndMethods() {
    for (int i = 0, length = topLevelTypes.length; i < length; i++)
      topLevelTypes[i].scope.buildFieldsAndMethods();
  }
  void buildTypeBindings() {
    if (referenceContext.compilationResult.compilationUnit != null) {
      char[][] expectedPackageName = referenceContext.compilationResult.compilationUnit.getPackageName();
      if (expectedPackageName != null && !CharOperation.equals(currentPackageName, expectedPackageName)) {

        // only report if the unit isn't structurally empty
        //			if (referenceContext.currentPackage != null 
        //					|| referenceContext.types != null 
        //					|| referenceContext.imports != null) {
        //				problemReporter().packageIsNotExpectedPackage(referenceContext);
        //			}
        currentPackageName = expectedPackageName.length == 0 ? CharOperation.NO_CHAR_CHAR : expectedPackageName;
      }
    }
    if (currentPackageName == CharOperation.NO_CHAR_CHAR) {
      if ((fPackage = environment.defaultPackage) == null) {
        problemReporter().mustSpecifyPackage(referenceContext);
        return;
      }
    } else {
      		if ((fPackage = environment.createPackage(currentPackageName)) == null) {
//      			problemReporter().packageCollidesWithType(referenceContext);
      			return;
      		}
      recordQualifiedReference(currentPackageName); // always dependent on your own package
    }

    // Skip typeDeclarations which know of previously reported errors
    ArrayList types = referenceContext.types;
    int typeLength = (types == null) ? 0 : types.size();
    topLevelTypes = new SourceTypeBinding[typeLength];
    int count = 0;
    nextType : for (int i = 0; i < typeLength; i++) {
      if (types.get(i) instanceof TypeDeclaration) {
        TypeDeclaration typeDecl = (TypeDeclaration) types.get(i);
        ReferenceBinding typeBinding = fPackage.getType0(typeDecl.name);
        recordSimpleReference(typeDecl.name); // needed to detect collision cases
        if (typeBinding != null && !(typeBinding instanceof UnresolvedReferenceBinding)) {
          // if a type exists, it must be a valid type - cannot be a NotFound problem type
          // unless its an unresolved type which is now being defined
          problemReporter().duplicateTypes(referenceContext, typeDecl);
          continue nextType;
        }
        if (fPackage != environment.defaultPackage && fPackage.getPackage(typeDecl.name) != null) {
          // if a package exists, it must be a valid package - cannot be a NotFound problem package
          problemReporter().typeCollidesWithPackage(referenceContext, typeDecl);
          continue nextType;
        }

        if ((typeDecl.modifiers & AccPublic) != 0) {
          char[] mainTypeName;
            if ((mainTypeName = referenceContext.getMainTypeName()) != null
            // mainTypeName == null means that implementor of ICompilationUnit decided to return null
              && !CharOperation.equals(mainTypeName, typeDecl.name)) {
            problemReporter().publicClassMustMatchFileName(referenceContext, typeDecl);
            continue nextType;
          }
        }

        ClassScope child = new ClassScope(this, typeDecl);
        SourceTypeBinding type = child.buildType(null, fPackage);
        if (type != null) {
          topLevelTypes[count++] = type;
        }
      }
    }

    // shrink topLevelTypes... only happens if an error was reported
    if (count != topLevelTypes.length)
      System.arraycopy(topLevelTypes, 0, topLevelTypes = new SourceTypeBinding[count], 0, count);
  }
  
  void checkAndSetImports() {
    // initialize the default imports if necessary... share the default java.lang.* import
    if (environment.defaultImports == null) {
      Binding importBinding = environment.getTopLevelPackage(JAVA);
      if (importBinding != null)
        importBinding = ((PackageBinding) importBinding).getTypeOrPackage(JAVA_LANG[1]);

      // abort if java.lang cannot be found...
      if (importBinding == null || !importBinding.isValidBinding())
        problemReporter().isClassPathCorrect(JAVA_LANG_OBJECT, referenceCompilationUnit());

      environment.defaultImports = new ImportBinding[] { new ImportBinding(JAVA_LANG, true, importBinding, null)};
    }
    if (referenceContext.imports == null) {
      imports = environment.defaultImports;
      return;
    }

    // allocate the import array, add java.lang.* by default
    int numberOfStatements = referenceContext.imports.length;
//    int numberOfImports = numberOfStatements + 1;
    int numberOfImports = numberOfStatements;
//    for (int i = 0; i < numberOfStatements; i++) {
//      ImportReference importReference = referenceContext.imports[i];
//      if (importReference.onDemand && CharOperation.equals(JAVA_LANG, importReference.tokens)) {
//        numberOfImports--;
//        break;
//      }
//    }
    ImportBinding[] resolvedImports = new ImportBinding[numberOfImports];
    resolvedImports[0] = environment.defaultImports[0];
    int index = 1;

    nextImport : for (int i = 0; i < numberOfStatements; i++) {
      ImportReference importReference = referenceContext.imports[i];
      IFile file = importReference.getFile();
      SourceTypeBinding typeBinding;
//      char[][] compoundName = importReference.tokens;
      char[][] compoundName=null;
      if (file != null){
        IPath path = file.getProjectRelativePath();
        String[] segs = path.segments(); 
        compoundName = new char[segs.length][];
        for (int j = 0; j < segs.length; j++) {
          compoundName[j] = segs[j].toCharArray();
        }
      }
      if (compoundName==null) {
        continue nextImport;
      }

      // skip duplicates or imports of the current package
      for (int j = 0; j < index; j++)
        if (resolvedImports[j].onDemand == importReference.onDemand)
          if (CharOperation.equals(compoundName, resolvedImports[j].compoundName))
            continue nextImport;
      if (importReference.onDemand == true)
        if (CharOperation.equals(compoundName, currentPackageName))
          continue nextImport;

      if (importReference.onDemand) {
        Binding importBinding = findOnDemandImport(compoundName);
        if (!importBinding.isValidBinding())
          continue nextImport; // we report all problems in faultInImports()
        resolvedImports[index++] = new ImportBinding(compoundName, true, importBinding, importReference);
      } else {
        resolvedImports[index++] = new ImportBinding(compoundName, false, null, importReference);
      }
    }

    // shrink resolvedImports... only happens if an error was reported
    if (resolvedImports.length > index)
      System.arraycopy(resolvedImports, 0, resolvedImports = new ImportBinding[index], 0, index);
    imports = resolvedImports;
  }
  /*
   * INTERNAL USE-ONLY
   * Innerclasses get their name computed as they are generated, since some may not
   * be actually outputed if sitting inside unreachable code.
   */
  public char[] computeConstantPoolName(LocalTypeBinding localType) {
    if (localType.constantPoolName() != null) {
      return localType.constantPoolName();
    }
    // delegates to the outermost enclosing classfile, since it is the only one with a global vision of its innertypes.

    if (constantPoolNameUsage == null)
      constantPoolNameUsage = new HashtableOfType();

    ReferenceBinding outerMostEnclosingType = localType.scope.outerMostClassScope().enclosingSourceType();

    // ensure there is not already such a local type name defined by the user
    int index = 0;
    char[] candidateName;
    while (true) {
      if (localType.isMemberType()) {
        if (index == 0) {
          candidateName = CharOperation.concat(localType.enclosingType().constantPoolName(), localType.sourceName, '$');
        } else {
          // in case of collision, then member name gets extra $1 inserted
          // e.g. class X { { class L{} new X(){ class L{} } } }
          candidateName =
            CharOperation.concat(localType.enclosingType().constantPoolName(), '$', String.valueOf(index).toCharArray(), '$', localType.sourceName);
        }
      } else if (localType.isAnonymousType()) {
        candidateName = CharOperation.concat(outerMostEnclosingType.constantPoolName(), String.valueOf(index + 1).toCharArray(), '$');
      } else {
        candidateName =
          CharOperation.concat(outerMostEnclosingType.constantPoolName(), '$', String.valueOf(index + 1).toCharArray(), '$', localType.sourceName);
      }
      if (constantPoolNameUsage.get(candidateName) != null) {
        index++;
      } else {
        constantPoolNameUsage.put(candidateName, localType);
        break;
      }
    }
    return candidateName;
  }

  void connectTypeHierarchy() {
    for (int i = 0, length = topLevelTypes.length; i < length; i++)
      topLevelTypes[i].scope.connectTypeHierarchy();
  }
  void faultInImports() {
    if (referenceContext.imports == null)
      return;
//
//    // collect the top level type names if a single type import exists
    int numberOfStatements = referenceContext.imports.length;
//    HashtableOfType typesBySimpleNames = null;
//    for (int i = 0; i < numberOfStatements; i++) {
//      if (!referenceContext.imports[i].onDemand) {
//        typesBySimpleNames = new HashtableOfType(topLevelTypes.length + numberOfStatements);
//        for (int j = 0, length = topLevelTypes.length; j < length; j++)
//          typesBySimpleNames.put(topLevelTypes[j].sourceName, topLevelTypes[j]);
//        break;
//      }
//    }
//
//    // allocate the import array, add java.lang.* by default
//    int numberOfImports = numberOfStatements + 1;
//    for (int i = 0; i < numberOfStatements; i++) {
//      ImportReference importReference = referenceContext.imports[i];
//      if (importReference.onDemand && CharOperation.equals(JAVA_LANG, importReference.tokens)) {
//        numberOfImports--;
//        break;
//      }
//    }
    ImportBinding[] resolvedImports = new ImportBinding[numberOfStatements];
//    resolvedImports[0] = environment.defaultImports[0];
//    int index = 1;
    int index = 0;
    nextImport : for (int i = 0; i < numberOfStatements; i++) {
      ImportReference importReference = referenceContext.imports[i];
      // create the file name segments here:
//      char[][] compoundName = importReference.tokens;
//
//      // skip duplicates or imports of the current package
//      for (int j = 0; j < index; j++)
//        if (resolvedImports[j].onDemand == importReference.onDemand)
//          if (CharOperation.equals(compoundName, resolvedImports[j].compoundName)) {
//            problemReporter().unusedImport(importReference); // since skipped, must be reported now
//            continue nextImport;
//          }
//      if (importReference.onDemand == true)
//        if (CharOperation.equals(compoundName, currentPackageName)) {
//          problemReporter().unusedImport(importReference); // since skipped, must be reported now
//          continue nextImport;
//        }
//      if (importReference.onDemand) {
//        Binding importBinding = findOnDemandImport(compoundName);
//        if (!importBinding.isValidBinding()) {
//          problemReporter().importProblem(importReference, importBinding);
//          continue nextImport;
//        }
//        resolvedImports[index++] = new ImportBinding(compoundName, true, importBinding, importReference);
//      } else {
      IFile file = importReference.getFile();
      SourceTypeBinding typeBinding;
      char[][] compoundName;
      if (file != null){
        typeBinding = new SourceTypeBinding(); 
//          findSingleTypeImport(compoundName);
        IPath path = file.getProjectRelativePath();
        String[] segs = path.segments(); 
        compoundName = new char[segs.length][];
        for (int j = 0; j < segs.length; j++) {
          compoundName[j] = segs[j].toCharArray();
        }
        typeBinding.compoundName = compoundName; // compoundName;
//    	this.fPackage = fPackage;
        typeBinding.fileName = file.getLocation().toString().toCharArray();  
//        typeBinding.modifiers = scope.referenceContext.modifiers;
//        typeBinding.sourceName = scope.referenceContext.name;
        typeBinding.sourceName = path.lastSegment().toCharArray();
//    	this.scope = scope;
    } else {
//        if (!typeBinding.isValidBinding()) {
//          problemReporter().importProblem(importReference, typeBinding);
          continue nextImport;
//        }
    }
//        if (typeBinding instanceof PackageBinding) {
//          problemReporter().cannotImportPackage(importReference);
//          continue nextImport;
//        }
//        if (typeBinding instanceof ReferenceBinding) {
//          ReferenceBinding referenceBinding = (ReferenceBinding) typeBinding;
//          if (importReference.isTypeUseDeprecated(referenceBinding, this)) {
//            problemReporter().deprecatedType((TypeBinding) typeBinding, importReference);
//          }
//        }
//        ReferenceBinding existingType = typesBySimpleNames.get(compoundName[compoundName.length - 1]);
//        if (existingType != null) {
//          // duplicate test above should have caught this case, but make sure
//          if (existingType == typeBinding) {
//            continue nextImport;
//          }
//          // either the type collides with a top level type or another imported type
//          for (int j = 0, length = topLevelTypes.length; j < length; j++) {
//            if (CharOperation.equals(topLevelTypes[j].sourceName, existingType.sourceName)) {
//              problemReporter().conflictingImport(importReference);
//              continue nextImport;
//            }
//          }
//          problemReporter().duplicateImport(importReference);
//          continue nextImport;
//        }
        resolvedImports[index++] = new ImportBinding(compoundName, false, typeBinding, importReference);
        imports = resolvedImports;
//        typesBySimpleNames.put(compoundName[compoundName.length - 1], (ReferenceBinding) typeBinding);
//      }
    }
//
//    // shrink resolvedImports... only happens if an error was reported
    if (resolvedImports.length > index)
      System.arraycopy(resolvedImports, 0, resolvedImports = new ImportBinding[index], 0, index);
    imports = resolvedImports;
    
    int length = imports.length;
	resolvedSingeTypeImports = new HashtableOfObject(length);
	for (int i = 0; i < length; i++) {
		ImportBinding binding = imports[i];
		if (!binding.onDemand)
			resolvedSingeTypeImports.put(binding.compoundName[binding.compoundName.length - 1], binding);
	}
  }
  public void faultInTypes() {
    faultInImports();
    if (topLevelTypes==null) {
			topLevelTypes = new SourceTypeBinding[0];
    }
    for (int i = 0, length = topLevelTypes.length; i < length; i++)
      topLevelTypes[i].faultInTypesForFieldsAndMethods();
  }
  private Binding findOnDemandImport(char[][] compoundName) {
    recordQualifiedReference(compoundName);

    Binding binding = environment.getTopLevelPackage(compoundName[0]);
    int i = 1;
    int length = compoundName.length;
    foundNothingOrType : if (binding != null) {
      PackageBinding packageBinding = (PackageBinding) binding;
      while (i < length) {
        binding = packageBinding.getTypeOrPackage(compoundName[i++]);
        if (binding == null || !binding.isValidBinding()) {
          binding = null;
          break foundNothingOrType;
        }
        if (!(binding instanceof PackageBinding))
          break foundNothingOrType;

        packageBinding = (PackageBinding) binding;
      }
      return packageBinding;
    }

    ReferenceBinding type;
    if (binding == null) {
      //		if (environment.defaultPackage == null
      //				|| environment.options.complianceLevel >= CompilerOptions.JDK1_4){
      //			return new ProblemReferenceBinding(
      //				CharOperation.subarray(compoundName, 0, i),
      //				NotFound);
      //		}
      type = findType(compoundName[0], environment.defaultPackage, environment.defaultPackage);
      if (type == null || !type.isValidBinding())
        return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i), NotFound);
      i = 1; // reset to look for member types inside the default package type
    } else {
      type = (ReferenceBinding) binding;
    }

    for (; i < length; i++) {
      if (!type.canBeSeenBy(fPackage)) {
        return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i), type, NotVisible);
      }
      // does not look for inherited member types on purpose
      if ((type = type.getMemberType(compoundName[i])) == null) {
        return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i + 1), NotFound);
      }
    }
    if (!type.canBeSeenBy(fPackage))
      return new ProblemReferenceBinding(compoundName, type, NotVisible);
    return type;
  }
  private Binding findSingleTypeImport(char[][] compoundName) {
//    if (compoundName.length == 1) {
      // findType records the reference
      // the name cannot be a package
      //		if (environment.defaultPackage == null 
      //			|| environment.options.complianceLevel >= CompilerOptions.JDK1_4)
      //			return new ProblemReferenceBinding(compoundName, NotFound);
      ReferenceBinding typeBinding = findType(compoundName[0], environment.defaultPackage, fPackage);
      if (typeBinding == null)
        return new ProblemReferenceBinding(compoundName, NotFound);
      else
        return typeBinding;
//    }
//    return findOnDemandImport(compoundName);
  }
  /* Answer the problem reporter to use for raising new problems.
  *
  * Note that as a side-effect, this updates the current reference context
  * (unit, type or method) in case the problem handler decides it is necessary
  * to abort.
  */

  public ProblemReporter problemReporter() {
    ProblemReporter problemReporter = referenceContext.problemReporter;
    problemReporter.referenceContext = referenceContext;
    return problemReporter;
  }

  /*
  What do we hold onto:
  
  1. when we resolve 'a.b.c', say we keep only 'a.b.c'
   & when we fail to resolve 'c' in 'a.b', lets keep 'a.b.c'
  THEN when we come across a new/changed/removed item named 'a.b.c',
   we would find all references to 'a.b.c'
  -> This approach fails because every type is resolved in every onDemand import to
   detect collision cases... so the references could be 10 times bigger than necessary.
  
  2. when we resolve 'a.b.c', lets keep 'a.b' & 'c'
   & when we fail to resolve 'c' in 'a.b', lets keep 'a.b' & 'c'
  THEN when we come across a new/changed/removed item named 'a.b.c',
   we would find all references to 'a.b' & 'c'
  -> This approach does not have a space problem but fails to handle collision cases.
   What happens if a type is added named 'a.b'? We would search for 'a' & 'b' but
   would not find a match.
  
  3. when we resolve 'a.b.c', lets keep 'a', 'a.b' & 'a', 'b', 'c'
   & when we fail to resolve 'c' in 'a.b', lets keep 'a', 'a.b' & 'a', 'b', 'c'
  THEN when we come across a new/changed/removed item named 'a.b.c',
   we would find all references to 'a.b' & 'c'
  OR 'a.b' -> 'a' & 'b'
  OR 'a' -> '' & 'a'
  -> As long as each single char[] is interned, we should not have a space problem
   and can handle collision cases.
  
  4. when we resolve 'a.b.c', lets keep 'a.b' & 'a', 'b', 'c'
   & when we fail to resolve 'c' in 'a.b', lets keep 'a.b' & 'a', 'b', 'c'
  THEN when we come across a new/changed/removed item named 'a.b.c',
   we would find all references to 'a.b' & 'c'
  OR 'a.b' -> 'a' & 'b' in the simple name collection
  OR 'a' -> 'a' in the simple name collection
  -> As long as each single char[] is interned, we should not have a space problem
   and can handle collision cases.
  */
  void recordQualifiedReference(char[][] qualifiedName) {
    if (qualifiedReferences == null)
      return; // not recording dependencies

    int length = qualifiedName.length;
    if (length > 1) {
      while (!qualifiedReferences.contains(qualifiedName)) {
        qualifiedReferences.add(qualifiedName);
        if (length == 2) {
          recordSimpleReference(qualifiedName[0]);
          recordSimpleReference(qualifiedName[1]);
          return;
        }
        length--;
        recordSimpleReference(qualifiedName[length]);
        System.arraycopy(qualifiedName, 0, qualifiedName = new char[length][], 0, length);
      }
    } else if (length == 1) {
      recordSimpleReference(qualifiedName[0]);
    }
  }
  void recordReference(char[][] qualifiedEnclosingName, char[] simpleName) {
    recordQualifiedReference(qualifiedEnclosingName);
    recordSimpleReference(simpleName);
  }
  void recordSimpleReference(char[] simpleName) {
    if (simpleNameReferences == null)
      return; // not recording dependencies

    if (!simpleNameReferences.contains(simpleName))
      simpleNameReferences.add(simpleName);
  }
  void recordTypeReference(TypeBinding type) {
    if (referencedTypes == null)
      return; // not recording dependencies

    if (type.isArrayType())
      type = ((ArrayBinding) type).leafComponentType;
    if (!type.isBaseType() && !referencedTypes.containsIdentical(type))
      referencedTypes.add(type);
  }
  void recordTypeReferences(TypeBinding[] types) {
    if (qualifiedReferences == null)
      return; // not recording dependencies
    if (types == null || types.length == 0)
      return;

    for (int i = 0, max = types.length; i < max; i++) {
      // No need to record supertypes of method arguments & thrown exceptions, just the compoundName
      // If a field/method is retrieved from such a type then a separate call does the job
      TypeBinding type = types[i];
      if (type.isArrayType())
        type = ((ArrayBinding) type).leafComponentType;
      if (!type.isBaseType()) {
        ReferenceBinding actualType = (ReferenceBinding) type;
        if (!actualType.isLocalType())
          recordQualifiedReference(actualType.isMemberType() ? CharOperation.splitOn('.', actualType.readableName()) : actualType.compoundName);
      }
    }
  }
  Binding resolveSingleTypeImport(ImportBinding importBinding) {
    if (importBinding.resolvedImport == null) {
      importBinding.resolvedImport = findSingleTypeImport(importBinding.compoundName);
      if (!importBinding.resolvedImport.isValidBinding() || importBinding.resolvedImport instanceof PackageBinding) {
        if (this.imports != null) {
          ImportBinding[] newImports = new ImportBinding[imports.length - 1];
          for (int i = 0, n = 0, max = this.imports.length; i < max; i++)
            if (this.imports[i] != importBinding) {
              newImports[n++] = this.imports[i];
            }
          this.imports = newImports;
        }
        return null;
      }
    }
    return importBinding.resolvedImport;
  }
  public void storeDependencyInfo() {
    // add the type hierarchy of each referenced type
    // cannot do early since the hierarchy may not be fully resolved
    for (int i = 0; i < referencedTypes.size; i++) { // grows as more types are added
      ReferenceBinding type = (ReferenceBinding) referencedTypes.elementAt(i);
      if (!type.isLocalType()) {
        recordQualifiedReference(type.isMemberType() ? CharOperation.splitOn('.', type.readableName()) : type.compoundName);
        ReferenceBinding enclosing = type.enclosingType();
        if (enclosing != null && !referencedTypes.containsIdentical(enclosing))
          referencedTypes.add(enclosing); // to record its supertypes
      }
      ReferenceBinding superclass = type.superclass();
      if (superclass != null && !referencedTypes.containsIdentical(superclass))
        referencedTypes.add(superclass); // to record its supertypes
      ReferenceBinding[] interfaces = type.superInterfaces();
      if (interfaces != null && interfaces.length > 0)
        for (int j = 0, length = interfaces.length; j < length; j++)
          if (!referencedTypes.containsIdentical(interfaces[j]))
            referencedTypes.add(interfaces[j]); // to record its supertypes
    }

    int size = qualifiedReferences.size;
    char[][][] qualifiedRefs = new char[size][][];
    for (int i = 0; i < size; i++)
      qualifiedRefs[i] = qualifiedReferences.elementAt(i);
    referenceContext.compilationResult.qualifiedReferences = qualifiedRefs;

    size = simpleNameReferences.size;
    char[][] simpleRefs = new char[size][];
    for (int i = 0; i < size; i++)
      simpleRefs[i] = simpleNameReferences.elementAt(i);
    referenceContext.compilationResult.simpleNameReferences = simpleRefs;
  }
  public String toString() {
    return "--- CompilationUnit Scope : " + new String(referenceContext.getFileName()); //$NON-NLS-1$
  }
  public void verifyMethods(MethodVerifier verifier) {
    for (int i = 0, length = topLevelTypes.length; i < length; i++)
      topLevelTypes[i].verifyMethods(verifier);
  }
}