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/*
* Copyright (c) 2014 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.oomph.targlets.internal.core.listeners;
import org.eclipse.oomph.util.IOUtil;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.ContentHandler;
import org.eclipse.emf.ecore.resource.URIConverter;
import org.eclipse.emf.ecore.resource.URIHandler;
import org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl;
import org.eclipse.emf.ecore.resource.impl.PlatformContentHandlerImpl;
import org.eclipse.emf.ecore.xmi.impl.XMLContentHandlerImpl;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ResourcesPlugin;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Map;
/**
* @author Eike Stepper
*/
public abstract class FileUpdater
{
private static final URIConverter URI_CONVERTER = new ExtensibleURIConverterImpl(URIHandler.DEFAULT_HANDLERS,
Arrays.asList(new ContentHandler[] { new PlatformContentHandlerImpl(), new XMLContentHandlerImpl() }));
public FileUpdater()
{
}
private URI getURI(File file)
{
for (IFile iFile : ResourcesPlugin.getWorkspace().getRoot().findFilesForLocationURI(file.toURI()))
{
IProject project = iFile.getProject();
if (project.isOpen())
{
return URI.createPlatformResourceURI(iFile.getFullPath().toString(), true);
}
}
return URI.createFileURI(file.toString());
}
protected Map<String, ?> getDescription(URI uri) throws IOException
{
return URI_CONVERTER.contentDescription(uri, null);
}
public boolean update(File file) throws Exception
{
URI uri = getURI(file);
Map<String, ?> description = getDescription(uri);
String nl = (String)description.get(ContentHandler.LINE_DELIMITER_PROPERTY);
String encoding = (String)description.get(ContentHandler.CHARSET_PROPERTY);
if (encoding == null)
{
encoding = "UTF-8";
}
String oldContents = URI_CONVERTER.exists(uri, null) ? getContents(uri, encoding) : null;
String newContents = createNewContents(oldContents, encoding, nl);
if (newContents != null && !newContents.equals(oldContents))
{
setContents(uri, encoding, newContents);
return true;
}
return false;
}
protected abstract String createNewContents(String oldContents, String encoding, String nl);
protected String getContents(URI uri, String encoding) throws IOException
{
InputStream inputStream = URI_CONVERTER.createInputStream(uri);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
try
{
IOUtil.copy(inputStream, outputStream);
}
finally
{
IOUtil.close(inputStream);
}
return new String(outputStream.toByteArray(), encoding);
}
protected void setContents(URI uri, String encoding, String contents) throws IOException
{
InputStream inputStream = new ByteArrayInputStream(contents.getBytes(encoding));
OutputStream outputStream = URI_CONVERTER.createOutputStream(uri);
try
{
IOUtil.copy(inputStream, outputStream);
}
finally
{
IOUtil.close(outputStream);
}
}
}
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