ReadOnlyResourceFinder.java

/*******************************************************************************
 * Copyright (c) 2000, 2007 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
 *
 
 *******************************************************************************/
package org.eclipse.dltk.internal.corext.refactoring.reorg;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.IProjectFragment;
import org.eclipse.dltk.core.IScriptFolder;
import org.eclipse.dltk.internal.corext.refactoring.RefactoringCoreMessages;
import org.eclipse.dltk.internal.corext.util.Resources;



class ReadOnlyResourceFinder{
	private ReadOnlyResourceFinder(){
	}

	static boolean confirmDeleteOfReadOnlyElements(IModelElement[] modelElements, IResource[] resources, IReorgQueries queries) throws CoreException {
		String queryTitle= RefactoringCoreMessages.ReadOnlyResourceFinder_0; 
		String question= RefactoringCoreMessages.ReadOnlyResourceFinder_1; 
		return ReadOnlyResourceFinder.confirmOperationOnReadOnlyElements(queryTitle, question, modelElements, resources, queries);
	}

	static boolean confirmMoveOfReadOnlyElements(IModelElement[] modelElements, IResource[] resources, IReorgQueries queries) throws CoreException {
		String queryTitle= RefactoringCoreMessages.ReadOnlyResourceFinder_2; 
		String question= RefactoringCoreMessages.ReadOnlyResourceFinder_3; 
		return ReadOnlyResourceFinder.confirmOperationOnReadOnlyElements(queryTitle, question, modelElements, resources, queries);
	}

	private static boolean confirmOperationOnReadOnlyElements(String queryTitle, String question, IModelElement[] modelElements, IResource[] resources, IReorgQueries queries) throws CoreException {
		boolean hasReadOnlyResources= ReadOnlyResourceFinder.hasReadOnlyResourcesAndSubResources(modelElements, resources);
		if (hasReadOnlyResources) {
			IConfirmQuery query= queries.createYesNoQuery(queryTitle, false, IReorgQueries.CONFIRM_READ_ONLY_ELEMENTS);
			return query.confirm(question);
		}
		return true;
	}

	private static boolean hasReadOnlyResourcesAndSubResources(IModelElement[] modelElements, IResource[] resources) throws CoreException {
		return (hasReadOnlyResourcesAndSubResources(resources)||
				  hasReadOnlyResourcesAndSubResources(modelElements));
	}

	private static boolean hasReadOnlyResourcesAndSubResources(IModelElement[] modelElements) throws CoreException {
		for (int i= 0; i < modelElements.length; i++) {
			if (hasReadOnlyResourcesAndSubResources(modelElements[i]))
				return true;
		}
		return false;
	}

	private static boolean hasReadOnlyResourcesAndSubResources(IModelElement modelElement) throws CoreException {
		switch(modelElement.getElementType()){			
			case IModelElement.SOURCE_MODULE:
				IResource resource= ReorgUtils.getResource(modelElement);
				return (resource != null && Resources.isReadOnly(resource));
			case IModelElement.SCRIPT_FOLDER:
				IResource packResource= ReorgUtils.getResource(modelElement);
				if (packResource == null)
					return false;
				IScriptFolder pack= (IScriptFolder)modelElement;
				if (Resources.isReadOnly(packResource))
					return true;
				Object[] nonScript= pack.getForeignResources();
				for (int i= 0; i < nonScript.length; i++) {
					Object object= nonScript[i];
					if (object instanceof IResource && hasReadOnlyResourcesAndSubResources((IResource)object))
						return true;
				}
				return hasReadOnlyResourcesAndSubResources(pack.getChildren());
			case IModelElement.PROJECT_FRAGMENT:
				IProjectFragment root= (IProjectFragment) modelElement;
				if (root.isArchive())
					return false;
				IResource pfrResource= ReorgUtils.getResource(modelElement);
				if (pfrResource == null)
					return false;
				if (Resources.isReadOnly(pfrResource))
					return true;
				Object[] nonScript1= root.getForeignResources();
				for (int i= 0; i < nonScript1.length; i++) {
					Object object= nonScript1[i];
					if (object instanceof IResource && hasReadOnlyResourcesAndSubResources((IResource)object))
						return true;
				}
				return hasReadOnlyResourcesAndSubResources(root.getChildren());

			case IModelElement.FIELD:
//			case IModelElement.IMPORT_CONTAINER:
//			case IModelElement.IMPORT_DECLARATION:
//			case IModelElement.INITIALIZER:
			case IModelElement.METHOD:
//			case IModelElement.PACKAGE_DECLARATION:
			case IModelElement.TYPE:
				return false;
			default: 
				Assert.isTrue(false);//not handled here
				return false;
		}
	}

	private static boolean hasReadOnlyResourcesAndSubResources(IResource[] resources) throws CoreException {
		for (int i= 0; i < resources.length; i++) {
			if (hasReadOnlyResourcesAndSubResources(resources[i]))
				return true;
		}
		return false;
	}

	private static boolean hasReadOnlyResourcesAndSubResources(IResource resource) throws CoreException {
		if (resource.isLinked()) //we don't want to count these because we never actually delete linked resources
			return false;
		if (Resources.isReadOnly(resource))
			return true;
		if (resource instanceof IContainer)
			return hasReadOnlyResourcesAndSubResources(((IContainer)resource).members());
		return false;
	}
}