Copyright (c) 2000, 2008 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.core;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.IOpenable;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.core.util.Messages;

This operation deletes a collection of resources and all of their children.
It does not delete resources which do not belong to the Java Model
(eg GIF files).
/**
 * This operation deletes a collection of resources and all of their children.
 * It does not delete resources which do not belong to the Java Model
 * (eg GIF files).
 */
public class DeleteResourceElementsOperation extends MultiOperation {
When executed, this operation will delete the given elements. The elements
to delete cannot be null or empty, and must have a corresponding
resource.
/**
 * When executed, this operation will delete the given elements. The elements
 * to delete cannot be <code>null</code> or empty, and must have a corresponding
 * resource.
 */
protected DeleteResourceElementsOperation(IJavaElement[] elementsToProcess, boolean force) {
	super(elementsToProcess, force);
}
Deletes the direct children of frag corresponding to its kind
(K_SOURCE or K_BINARY), and deletes the corresponding folder if it is then
empty.
/**
 * Deletes the direct children of <code>frag</code> corresponding to its kind
 * (K_SOURCE or K_BINARY), and deletes the corresponding folder if it is then
 * empty.
 */
private void deletePackageFragment(IPackageFragment frag)
	throws JavaModelException {
	IResource res = ((JavaElement) frag).resource();
	if (res != null) {
		// collect the children to remove
		IJavaElement[] childrenOfInterest = frag.getChildren();
		if (childrenOfInterest.length > 0) {
			IResource[] resources = new IResource[childrenOfInterest.length];
			// remove the children
			for (int i = 0; i < childrenOfInterest.length; i++) {
				resources[i] = ((JavaElement) childrenOfInterest[i]).resource();
			}
			deleteResources(resources, this.force);
		}

		// Discard non-java resources
		Object[] nonJavaResources = frag.getNonJavaResources();
		int actualResourceCount = 0;
		for (int i = 0, max = nonJavaResources.length; i < max; i++){
			if (nonJavaResources[i] instanceof IResource) actualResourceCount++;
		}
		IResource[] actualNonJavaResources = new IResource[actualResourceCount];
		for (int i = 0, max = nonJavaResources.length, index = 0; i < max; i++){
			if (nonJavaResources[i] instanceof IResource) actualNonJavaResources[index++] = (IResource)nonJavaResources[i];
		}
		deleteResources(actualNonJavaResources, this.force);

		// delete remaining files in this package (.class file in the case where Proj=src=bin)
		IResource[] remainingFiles;
		try {
			remainingFiles = ((IContainer) res).members();
		} catch (CoreException ce) {
			throw new JavaModelException(ce);
		}
		boolean isEmpty = true;
		for (int i = 0, length = remainingFiles.length; i < length; i++) {
			IResource file = remainingFiles[i];
			if (file instanceof IFile && org.eclipse.jdt.internal.compiler.util.Util.isClassFileName(file.getName())) {
				deleteResource(file, IResource.FORCE | IResource.KEEP_HISTORY);
			} else {
				isEmpty = false;
			}
		}
		if (isEmpty && !frag.isDefaultPackage()/*don't delete default package's folder: see https://bugs.eclipse.org/bugs/show_bug.cgi?id=38450*/) {
			// delete recursively empty folders
			IResource fragResource =  ((JavaElement) frag).resource();
			if (fragResource != null) {
				deleteEmptyPackageFragment(frag, false, fragResource.getParent());
			}
		}
	}
}
See Also:
MultiOperation/**
 * @see MultiOperation
 */
@Override
protected String getMainTaskName() {
	return Messages.operation_deleteResourceProgress;
}
See Also:
This method delegate to deleteResource or
deletePackageFragment depending on the type of element./**
 * @see MultiOperation This method delegate to <code>deleteResource</code> or
 * <code>deletePackageFragment</code> depending on the type of <code>element</code>.
 */
@Override
protected void processElement(IJavaElement element) throws JavaModelException {
	switch (element.getElementType()) {
		case IJavaElement.CLASS_FILE :
		case IJavaElement.COMPILATION_UNIT :
			deleteResource(element.getResource(), this.force ? IResource.FORCE | IResource.KEEP_HISTORY : IResource.KEEP_HISTORY);
			break;
		case IJavaElement.PACKAGE_FRAGMENT :
			deletePackageFragment((IPackageFragment) element);
			break;
		default :
			throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INVALID_ELEMENT_TYPES, element));
	}
	// ensure the element is closed
	if (element instanceof IOpenable) {
		((IOpenable)element).close();
	}
}
See Also:
MultiOperation/**
 * @see MultiOperation
 */
@Override
protected void verify(IJavaElement element) throws JavaModelException {
	if (element == null || !element.exists())
		error(IJavaModelStatusConstants.ELEMENT_DOES_NOT_EXIST, element);

	int type = element.getElementType();
	if (type <= IJavaElement.PACKAGE_FRAGMENT_ROOT || type > IJavaElement.COMPILATION_UNIT)
		error(IJavaModelStatusConstants.INVALID_ELEMENT_TYPES, element);
	else if (type == IJavaElement.PACKAGE_FRAGMENT && element instanceof JarPackageFragment)
		error(IJavaModelStatusConstants.INVALID_ELEMENT_TYPES, element);
	IResource resource = ((JavaElement) element).resource();
	if (resource instanceof IFolder) {
		if (resource.isLinked()) {
			error(IJavaModelStatusConstants.INVALID_RESOURCE, element);
		}
	}
}
}