content: /*******************************************************************************
   * Copyright (c) 2000, 2009 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.wst.jsdt.internal.corext.refactoring.util;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.wst.jsdt.core.IIncludePathEntry;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IField;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IJavaScriptProject;
  import org.eclipse.wst.jsdt.core.IMember;
  import org.eclipse.wst.jsdt.core.IFunction;
  import org.eclipse.wst.jsdt.core.IPackageFragment;
  import org.eclipse.wst.jsdt.core.IPackageFragmentRoot;
  import org.eclipse.wst.jsdt.core.ISourceReference;
  import org.eclipse.wst.jsdt.core.IType;
  import org.eclipse.wst.jsdt.core.JavaScriptCore;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.core.Signature;
  import org.eclipse.wst.jsdt.internal.corext.SourceRange;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringCoreMessages;
  import org.eclipse.wst.jsdt.internal.corext.util.JavaModelUtil;
  
  public class JavaElementUtil {
  	
  	//no instances
  	private JavaElementUtil(){
  	}
  	
  	public static String createMethodSignature(IFunction method){
  		try {
  			return Signature.toString(method.getSignature(), method.getElementName(), method.getParameterNames(), false, ! method.isConstructor());
  		} catch(JavaScriptModelException e) {
  			return method.getElementName(); //fallback
  		}
  	}
  	
  	public static String createFieldSignature(IField field){
  		return JavaModelUtil.getFullyQualifiedName(field.getDeclaringType()) + "." + field.getElementName(); //$NON-NLS-1$
  	}
  	
  	public static String createSignature(IMember member){
  		switch (member.getElementType()){
  			case IJavaScriptElement.FIELD:
  				return createFieldSignature((IField)member);
  			case IJavaScriptElement.TYPE:
  				return JavaModelUtil.getFullyQualifiedName(((IType)member));
  			case IJavaScriptElement.INITIALIZER:
  				return RefactoringCoreMessages.JavaElementUtil_initializer; 
  			case IJavaScriptElement.METHOD:
  				return createMethodSignature((IFunction)member);				
  			default:
  				Assert.isTrue(false);
  				return null;	
  		}
  	}
  	
  	public static IJavaScriptElement[] getElementsOfType(IJavaScriptElement[] elements, int type){
  		Set result= new HashSet(elements.length);
  		for (int i= 0; i < elements.length; i++) {
  			IJavaScriptElement element= elements[i];
  			if (element.getElementType() == type)
  				result.add(element);
  		}
  		return (IJavaScriptElement[]) result.toArray(new IJavaScriptElement[result.size()]);
  	}
  
  	public static IType getMainType(IJavaScriptUnit cu) throws JavaScriptModelException{
  		IType[] types= cu.getTypes();
  		for (int i = 0; i < types.length; i++) {
  			if (isMainType(types[i]))
  				return types[i];
  		}
  		return null;
  	}
  	
  	public static boolean isMainType(IType type) throws JavaScriptModelException{
  		if (! type.exists())	
  			return false;
  
  		if (type.isBinary())
  			return false;
  			
  		if (type.getJavaScriptUnit() == null)
  			return false;
  		
  		if (type.getDeclaringType() != null)
  			return false;
  		
  		return isPrimaryType(type) || isCuOnlyType(type);
  	}
  
  
  	private static boolean isPrimaryType(IType type){
  		return type.equals(type.getJavaScriptUnit().findPrimaryType());
  	}
  
  
  	private static boolean isCuOnlyType(IType type) throws JavaScriptModelException{
  		return type.getJavaScriptUnit().getTypes().length == 1;
  	}
  
  	/** see org.eclipse.wst.jsdt.internal.core.JavaElement#isAncestorOf(org.eclipse.wst.jsdt.core.IJavaScriptElement) */
  	public static boolean isAncestorOf(IJavaScriptElement ancestor, IJavaScriptElement child) {
  		IJavaScriptElement parent= child.getParent();
  		while (parent != null && !parent.equals(ancestor)) {
  			parent= parent.getParent();
  		}
  		return parent != null;
  	}
  	
  	public static IFunction[] getAllConstructors(IType type) throws JavaScriptModelException {
  		List result= new ArrayList();
  		IFunction[] methods= type.getFunctions();
  		for (int i= 0; i < methods.length; i++) {
  			IFunction iMethod= methods[i];
  			if (iMethod.isConstructor())
  				result.add(iMethod);
  		}
  		return (IFunction[]) result.toArray(new IFunction[result.size()]);
  	}
  
  	/**
  	 * Returns an array of projects that have the specified root on their
  	 * classpaths.
  	 */
  	public static IJavaScriptProject[] getReferencingProjects(IPackageFragmentRoot root) throws JavaScriptModelException {
  		IIncludePathEntry cpe= root.getRawIncludepathEntry();
  		IJavaScriptProject[] allJavaProjects= JavaScriptCore.create(ResourcesPlugin.getWorkspace().getRoot()).getJavaScriptProjects();
  		List result= new ArrayList(allJavaProjects.length);
  		for (int i= 0; i < allJavaProjects.length; i++) {
  			IJavaScriptProject project= allJavaProjects[i];
  			IPackageFragmentRoot[] roots= project.findPackageFragmentRoots(cpe);
  			if (roots.length > 0)
  				result.add(project);
  		}
  		return (IJavaScriptProject[]) result.toArray(new IJavaScriptProject[result.size()]);
  	}	
  	
  	public static IMember[] merge(IMember[] a1, IMember[] a2) {
  		// Don't use hash sets since ordering is important for some refactorings.
  		List result= new ArrayList(a1.length + a2.length);
  		for (int i= 0; i < a1.length; i++) {
  			IMember member= a1[i];
  			if (!result.contains(member))
  				result.add(member);
  		}
  		for (int i= 0; i < a2.length; i++) {
  			IMember member= a2[i];
  			if (!result.contains(member))
  				result.add(member);
  		}
  		return (IMember[]) result.toArray(new IMember[result.size()]);
  	}
  
  	public static boolean isDefaultPackage(Object element) {
  		return (element instanceof IPackageFragment) && ((IPackageFragment)element).isDefaultPackage();
  	}
  	
  	/**
  	 * @param pack a package fragment
  	 * @return an array containing the given package and all subpackages 
  	 * @throws JavaScriptModelException 
  	 */
  	public static IPackageFragment[] getPackageAndSubpackages(IPackageFragment pack) throws JavaScriptModelException {
  		if (pack.isDefaultPackage())
  			return new IPackageFragment[] { pack };
  		
  		IPackageFragmentRoot root= (IPackageFragmentRoot) pack.getParent();
  		IJavaScriptElement[] allPackages= root.getChildren();
  		ArrayList subpackages= new ArrayList();
  		subpackages.add(pack);
  		String prefix= pack.getElementName() + '.';
  		for (int i= 0; i < allPackages.length; i++) {
  			IPackageFragment currentPackage= (IPackageFragment) allPackages[i];
  			if (currentPackage.getElementName().startsWith(prefix))
  				subpackages.add(currentPackage);
  		}
  		return (IPackageFragment[]) subpackages.toArray(new IPackageFragment[subpackages.size()]);
  	}
  	
  	/**
  	 * @param pack the package fragment; may not be null
  	 * @return the parent package fragment, or null if the given package fragment is the default package or a top level package
  	 */
  	public static IPackageFragment getParentSubpackage(IPackageFragment pack) {
  		if (pack.isDefaultPackage())
  			return null;
  		
  		final int index= pack.getElementName().lastIndexOf('.');
  		if (index == -1)
  			return null;
  
  		final IPackageFragmentRoot root= (IPackageFragmentRoot) pack.getParent();
  		final String newPackageName= pack.getElementName().substring(0, index);
  		final IPackageFragment parent= root.getPackageFragment(newPackageName);
  		if (parent.exists())
  			return parent;
  		else
  			return null;
  	}
  	
  	public static IMember[] sortByOffset(IMember[] members){
  		Comparator comparator= new Comparator(){
  			public int compare(Object o1, Object o2){
  				try{
  					return ((IMember) o1).getNameRange().getOffset() - ((IMember) o2).getNameRange().getOffset();
  				} catch (JavaScriptModelException e){
  					return 0;
  				}	
  			}
  		};
  		Arrays.sort(members, comparator);
  		return members;
  	}
  	
  	public static boolean isSourceAvailable(ISourceReference sourceReference) {
  		try {
  			return SourceRange.isAvailable(sourceReference.getSourceRange());
  		} catch (JavaScriptModelException e) {
  			return false;
  		}
  	}
  }
  