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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.xmlbeans.impl.jam.internal.elements;

import org.apache.xmlbeans.impl.jam.JAnnotation;
import org.apache.xmlbeans.impl.jam.JAnnotationValue;
import org.apache.xmlbeans.impl.jam.JClass;
import org.apache.xmlbeans.impl.jam.JComment;
import org.apache.xmlbeans.impl.jam.JConstructor;
import org.apache.xmlbeans.impl.jam.JField;
import org.apache.xmlbeans.impl.jam.JMethod;
import org.apache.xmlbeans.impl.jam.JPackage;
import org.apache.xmlbeans.impl.jam.JProperty;
import org.apache.xmlbeans.impl.jam.JSourcePosition;
import org.apache.xmlbeans.impl.jam.internal.JamClassLoaderImpl;
import org.apache.xmlbeans.impl.jam.internal.classrefs.JClassRef;
import org.apache.xmlbeans.impl.jam.internal.classrefs.JClassRefContext;
import org.apache.xmlbeans.impl.jam.internal.classrefs.QualifiedJClassRef;
import org.apache.xmlbeans.impl.jam.internal.classrefs.UnqualifiedJClassRef;
import org.apache.xmlbeans.impl.jam.mutable.MClass;
import org.apache.xmlbeans.impl.jam.mutable.MConstructor;
import org.apache.xmlbeans.impl.jam.mutable.MField;
import org.apache.xmlbeans.impl.jam.mutable.MMethod;
import org.apache.xmlbeans.impl.jam.provider.JamClassPopulator;
import org.apache.xmlbeans.impl.jam.visitor.JVisitor;
import org.apache.xmlbeans.impl.jam.visitor.MVisitor;

import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

/**
 * Implementation of JClass and MClass.
 *
 * @author Patrick Calahan 
 */
public class ClassImpl extends MemberImpl implements MClass,
  JClassRef, JClassRefContext
{
  // ========================================================================
  // Constants

  public static final int NEW = 1;
  public static final int UNPOPULATED = 2;
  public static final int POPULATING = 3;
  public static final int UNINITIALIZED = 4;
  public static final int INITIALIZING = 5;
  public static final int LOADED = 6;

  // ========================================================================
  // Variables

  private int mState = NEW;

  private boolean mIsAnnotationType = false;
  private boolean mIsInterface = false;
  private boolean mIsEnum = false;

  private String mPackageName = null;

  private JClassRef mSuperClassRef = null; // classrefs to the class we extend
  private ArrayList mInterfaceRefs = null; // refs to interfaces we elements.

  private ArrayList mFields = null;
  private ArrayList mMethods = null;
  private ArrayList mConstructors = null;
  private ArrayList mProperties = null;
  private ArrayList mDeclaredProperties = null;
  private ArrayList mInnerClasses = null;

  private String[] mImports = null;

  private JamClassPopulator mPopulator;

  // FIXME implement this - we should only create one UnqualifiedJClassRef
  // for each unqualified name so as to avoid resolving them over and over.
  //private Map mName2Uqref = null;

  // ========================================================================
  // Constructors

  public ClassImpl(String packageName,
                   String simpleName,
                   ElementContext ctx,
                   String[] importSpecs,
                   JamClassPopulator populator) {
    super(ctx);
    super.setSimpleName(simpleName);
    mPackageName = packageName.trim();
    mImports = importSpecs;
    mPopulator = populator;
    setState(UNPOPULATED);
  }

  public ClassImpl(String packageName,
                   String simpleName,
                   ElementContext ctx,
                   String[] importSpecs)
  {
    super(ctx);
    super.setSimpleName(simpleName);
    mPackageName = packageName.trim();
    mImports = importSpecs;
    mPopulator = null;
    setState(UNINITIALIZED);
  }

  private ClassImpl(String packageName,
                    String simpleName,
                    String[] importSpecs,
                    ClassImpl parent)
  {
    super(parent);
    super.setSimpleName(simpleName);
    mPackageName = packageName.trim();
    mImports = importSpecs;
    mPopulator = null;
    setState(UNINITIALIZED);
  }



  // ========================================================================
  // JClass implementation

  public JPackage getContainingPackage() {
    return getClassLoader().getPackage(mPackageName);
  }

  public JClass getSuperclass() {
    ensureLoaded();
    if (mSuperClassRef == null) {
      return null;
    } else {
      return mSuperClassRef.getRefClass();
    }
  }

  public JClass[] getInterfaces() {
    ensureLoaded();
    if (mInterfaceRefs == null || mInterfaceRefs.size() == 0) {
      return new JClass[0];
    } else {
      JClass[] out = new JClass[mInterfaceRefs.size()];
      for(int i=0; i 0) ? (mPackageName + '.') : "") +
      mSimpleName;
  }

  // ========================================================================
  // JClassRef implementation (to accommodate direct references)

  public JClass getRefClass() { return this; }

  // ========================================================================
  // JClassRefContext implementation

  public String getPackageName() {
    return mPackageName;
  }

  public String[] getImportSpecs() {
    ensureLoaded();
    if (mImports == null) return new String[0];
    return mImports;
  }

  // ========================================================================
  // Public methods for internal use only

  public void setState(int state) {
    mState = state;
  }

  // ========================================================================
  // Public static utility methods

  /**
   * Throws an IllegalArgument exception if the given string is not a valid
   * class name.  Useful for parameter checking in several places.
   */
  public static void validateClassName(String className)
          throws IllegalArgumentException
  {
    if (className == null) {
      throw new IllegalArgumentException("null class name specified");
    }
    if (!Character.isJavaIdentifierStart(className.charAt(0))) {
      throw new IllegalArgumentException
              ("Invalid first character in class name: "+className);
    }
    for(int i=1; i