core/plugins/org.eclipse.dltk.ui/core refactoring/org/eclipse/dltk/internal/corext/refactoring/nls/changes/CreateFileChange.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 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.nls.changes;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URI;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileInfo;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.dltk.core.IModelStatusConstants;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.internal.corext.refactoring.base.DLTKChange;
import org.eclipse.dltk.internal.corext.util.Messages;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;

public class CreateFileChange extends DLTKChange {

	private String fChangeName;

	private IPath fPath;
	private String fSource;
	private String fEncoding;
	private boolean fExplicitEncoding;
	private long fStampToRestore;

	public CreateFileChange(IPath path, String source, String encoding) {
		this(path, source, encoding, IResource.NULL_STAMP);
	}

	public CreateFileChange(IPath path, String source, String encoding,
			long stampToRestore) {
		Assert.isNotNull(path, "path"); //$NON-NLS-1$
		Assert.isNotNull(source, "source"); //$NON-NLS-1$
		fPath = path;
		fSource = source;
		fEncoding = encoding;
		fExplicitEncoding = fEncoding != null;
		fStampToRestore = stampToRestore;
	}

	/*
	 * private CreateFileChange(IPath path, String source, String encoding, long
	 * stampToRestore, boolean explicit) { Assert.isNotNull(path, "path");
	 * //$NON-NLS-1$ Assert.isNotNull(source, "source"); //$NON-NLS-1$
	 * Assert.isNotNull(encoding, "encoding"); //$NON-NLS-1$ fPath= path;
	 * fSource= source; fEncoding= encoding; fStampToRestore= stampToRestore;
	 * fExplicitEncoding= explicit; }
	 */

	protected void setEncoding(String encoding, boolean explicit) {
		Assert.isNotNull(encoding, "encoding"); //$NON-NLS-1$
		fEncoding = encoding;
		fExplicitEncoding = explicit;
	}

	@Override
	public String getName() {
		if (fChangeName == null)
			return Messages.format(NLSChangesMessages.createFile_Create_file,
					fPath.toOSString());
		else
			return fChangeName;
	}

	public void setName(String name) {
		fChangeName = name;
	}

	protected void setSource(String source) {
		fSource = source;
	}

	protected String getSource() {
		return fSource;
	}

	protected void setPath(IPath path) {
		fPath = path;
	}

	protected IPath getPath() {
		return fPath;
	}

	@Override
	public Object getModifiedElement() {
		return ResourcesPlugin.getWorkspace().getRoot().getFile(fPath);
	}

	@Override
	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
		RefactoringStatus result = new RefactoringStatus();
		IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile(fPath);

		URI location = file.getLocationURI();
		if (location == null) {
			result.addFatalError(Messages.format(
					NLSChangesMessages.CreateFileChange_error_unknownLocation,
					file.getFullPath().toString()));
			return result;
		}

		IFileInfo jFile = EFS.getStore(location).fetchInfo();
		if (jFile.exists()) {
			result.addFatalError(Messages.format(
					NLSChangesMessages.CreateFileChange_error_exists,
					file.getFullPath().toString()));
			return result;
		}
		return result;
	}

	@Override
	public Change perform(IProgressMonitor pm) throws CoreException {

		try {
			pm.beginTask(NLSChangesMessages.createFile_creating_resource, 3);

			initializeEncoding();
			IFile file = getOldFile(new SubProgressMonitor(pm, 1));
			/*
			 * if (file.exists()) { CompositeChange composite= new
			 * CompositeChange(getName()); composite.add(new
			 * DeleteFileChange(file)); composite.add(new
			 * CreateFileChange(fPath, fSource, fEncoding, fStampToRestore,
			 * fExplicitEncoding)); pm.worked(1); return composite.perform(new
			 * SubProgressMonitor(pm, 1)); } else {
			 */
			try (InputStream is = new ByteArrayInputStream(
					fSource.getBytes(fEncoding))) {

				file.create(is, false, new SubProgressMonitor(pm, 1));
				if (fStampToRestore != IResource.NULL_STAMP) {
					file.revertModificationStamp(fStampToRestore);
				}
				if (fExplicitEncoding) {
					file.setCharset(fEncoding, new SubProgressMonitor(pm, 1));
				} else {
					pm.worked(1);
				}
				return new DeleteFileChange(file);
			} catch (UnsupportedEncodingException e) {
				throw new ModelException(e, IModelStatusConstants.IO_EXCEPTION);
			} catch (IOException ioe) {
				throw new ModelException(ioe,
						IModelStatusConstants.IO_EXCEPTION);
			}
		} finally {
			pm.done();
		}
	}

	protected IFile getOldFile(IProgressMonitor pm) {
		pm.beginTask("", 1); //$NON-NLS-1$
		try {
			return ResourcesPlugin.getWorkspace().getRoot().getFile(fPath);
		} finally {
			pm.done();
		}
	}

	private void initializeEncoding() {
		if (fEncoding == null) {
			fExplicitEncoding = false;
			IFile file = ResourcesPlugin.getWorkspace().getRoot()
					.getFile(fPath);
			if (file != null) {
				try {
					if (file.exists()) {
						fEncoding = file.getCharset(false);
						if (fEncoding == null) {
							fEncoding = file.getCharset(true);
						} else {
							fExplicitEncoding = true;
						}
					} else {
						fEncoding = file.getCharset(true);
					}
				} catch (CoreException e) {
					fEncoding = ResourcesPlugin.getEncoding();
					fExplicitEncoding = true;
				}
			} else {
				fEncoding = ResourcesPlugin.getEncoding();
				fExplicitEncoding = true;
			}
		}
		Assert.isNotNull(fEncoding);
	}
}