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/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui;

import org.eclipse.core.runtime.IAdaptable;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.ui.IContainmentAdapter;

import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModel;
import org.eclipse.jdt.core.JavaCore;

public class JavaElementContainmentAdapter implements IContainmentAdapter {

  private IJavaModel fJavaModel= JavaCore.create(ResourcesPlugin.getWorkspace().getRoot());

  public boolean contains(Object workingSetElement, Object element, int flags) {
    if (!(workingSetElement instanceof IJavaElement) || element == null)
      return false;

    IJavaElement workingSetJavaElement= (IJavaElement)workingSetElement;
    IResource resource= null;
    IJavaElement jElement= null;
    if (element instanceof IJavaElement) {
      jElement= (IJavaElement)element;
      resource= jElement.getResource();
    } else {
      if (element instanceof IAdaptable) {
        resource= (IResource)((IAdaptable)element).getAdapter(IResource.class);
        if (resource != null) {
          if (fJavaModel.contains(resource)) {
            jElement= JavaCore.create(resource);
            if (jElement != null && !jElement.exists())
              jElement= null;
          }
        }
      }
    }

    if (jElement != null) {
      if (contains(workingSetJavaElement, jElement, flags))
        return true;
      if (workingSetJavaElement.getElementType() == IJavaElement.PACKAGE_FRAGMENT &&
        resource.getType() == IResource.FOLDER && checkIfDescendant(flags))
        return isChild(workingSetJavaElement, resource);
    } else if (resource != null) {
      return contains(workingSetJavaElement, resource, flags);
    }
    return false;
  }

  private boolean contains(IJavaElement workingSetElement, IJavaElement element, int flags) {
    if (checkContext(flags) && workingSetElement.equals(element)) {
      return true;
    }
    if (checkIfChild(flags) && workingSetElement.equals(element.getParent())) {
      return true;
    }
    if (checkIfDescendant(flags) && check(workingSetElement, element)) {
      return true;
    }
    if (checkIfAncestor(flags) && check(element, workingSetElement)) {
      return true;
    }
    return false;
  }

  private boolean check(IJavaElement ancestor, IJavaElement descendent) {
    descendent= descendent.getParent();
    while (descendent != null) {
      if (ancestor.equals(descendent))
        return true;
      descendent= descendent.getParent();
    }
    return false;
  }

  private boolean isChild(IJavaElement workingSetElement, IResource element) {
    IResource resource= workingSetElement.getResource();
    if (resource == null)
      return false;
    return check(element, resource);
  }

  private boolean contains(IJavaElement workingSetElement, IResource element, int flags) {
    IResource workingSetResource= workingSetElement.getResource();
    if (workingSetResource == null)
      return false;
    if (checkContext(flags) && workingSetResource.equals(element)) {
      return true;
    }
    if (checkIfChild(flags) && workingSetResource.equals(element.getParent())) {
      return true;
    }
    if (checkIfDescendant(flags) && check(workingSetResource, element)) {
      return true;
    }
    if (checkIfAncestor(flags) && check(element, workingSetResource)) {
      return true;
    }
    return false;
  }

  private boolean check(IResource ancestor, IResource descendent) {
    descendent= descendent.getParent();
    while(descendent != null) {
      if (ancestor.equals(descendent))
        return true;
      descendent= descendent.getParent();
    }
    return false;
  }

  private boolean checkIfDescendant(int flags) {
    return (flags & CHECK_IF_DESCENDANT) != 0;
  }

  private boolean checkIfAncestor(int flags) {
    return (flags & CHECK_IF_ANCESTOR) != 0;
  }

  private boolean checkIfChild(int flags) {
    return (flags & CHECK_IF_CHILD) != 0;
  }

  private boolean checkContext(int flags) {
    return (flags & CHECK_CONTEXT) != 0;
  }
}
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