/*******************************************************************************
 * Copyright (c) 2000, 2011 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.corext.refactoring.reorg;

import java.util.ArrayList;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.mapping.IResourceChangeDescriptionFactory;

import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.core.refactoring.participants.RefactoringParticipant;
import org.eclipse.ltk.core.refactoring.participants.RefactoringProcessor;
import org.eclipse.ltk.core.refactoring.participants.SharableParticipants;
import org.eclipse.ltk.core.refactoring.participants.ValidateEditChecker;

import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;

import org.eclipse.jdt.internal.corext.refactoring.participants.ResourceModifications;

public abstract class RefactoringModifications {

	private ResourceModifications fResourceModifications;

	public RefactoringModifications() {
		fResourceModifications= new ResourceModifications();
	}

	public ResourceModifications getResourceModifications() {
		return fResourceModifications;
	}

	public abstract RefactoringParticipant[] loadParticipants(RefactoringStatus status, RefactoringProcessor owner, String[] natures, SharableParticipants shared);

	public abstract void buildDelta(IResourceChangeDescriptionFactory builder);

	/**
	 * Implementors add all resources that need a validate edit
	 * @param checker the validate edit checker
	 */
	public void buildValidateEdits(ValidateEditChecker checker) {
		// Default implementation does nothing.
	}

	protected void createIncludingParents(IContainer container) {
		while (container != null
				&& !container.exists()
				&& !getResourceModifications().willExist(container)) {
			getResourceModifications().addCreate(container);
			container= container.getParent();
		}
	}

	protected IResource[] collectResourcesOfInterest(IPackageFragment source) throws CoreException {
		IJavaElement[] children = source.getChildren();
		int childOfInterest = IJavaElement.COMPILATION_UNIT;
		if (source.getKind() == IPackageFragmentRoot.K_BINARY) {
			childOfInterest = IJavaElement.CLASS_FILE;
		}
		ArrayList<IResource> result = new ArrayList<>(children.length);
		for (IJavaElement child : children) {
			if (child.getElementType() == childOfInterest && child.getResource() != null) {
				result.add(child.getResource());
			}
		}
		// Gather non-java resources
		for (Object element : source.getNonJavaResources()) {
			if (element instanceof IResource) {
				result.add((IResource) element);
			}
		}
		return result.toArray(new IResource[result.size()]);
	}

	protected IFile getClasspathFile(IResource resource) {
		IProject project= resource.getProject();
		if (project == null)
			return null;
		IResource result= project.findMember(".classpath"); //$NON-NLS-1$
		if (result instanceof IFile)
			return (IFile)result;
		return null;
	}
}
