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/*******************************************************************************
* Copyright (c) 2009 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.utils;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.IFilesystemUtility;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
/**
* Manager class that consults contributors to the FileSystemUtility extension point to perform operations corresponding to those filesystems.
*
* <strong>EXPERIMENTAL</strong>. This class or interface has been added as
* part of a work in progress. There is no guarantee that this API will work or
* that it will remain the same. Please do not use this API without consulting
* with the CDT team.
*
* @author crecoskie
* @noextend This class is not intended to be extended by clients.
* @since 5.0.3
*/
public class FileSystemUtilityManager {
private static FileSystemUtilityManager instance;
private Map<String, IFilesystemUtility> fSchemeToUtilityImplementerMap;
private static String EXTENSION_ID = "FileSystemUtility"; //$NON-NLS-1$
private FileSystemUtilityManager() {
fSchemeToUtilityImplementerMap = new HashMap<String, IFilesystemUtility>();
loadExtensions();
}
private void loadExtensions() {
IExtensionPoint extension = Platform.getExtensionRegistry().getExtensionPoint(CCorePlugin.PLUGIN_ID,
EXTENSION_ID);
if (extension != null) {
IExtension[] extensions = extension.getExtensions();
for (int i = 0; i < extensions.length; i++) {
IConfigurationElement[] configElements = extensions[i].getConfigurationElements();
for (int j = 0; j < configElements.length; j++) {
String scheme = configElements[j].getAttribute("scheme"); //$NON-NLS-1$
String utility = configElements[j].getAttribute("class"); //$NON-NLS-1$
if (utility != null) {
try {
Object execExt = configElements[j].createExecutableExtension("class"); //$NON-NLS-1$
if (execExt instanceof IFilesystemUtility) {
fSchemeToUtilityImplementerMap.put(scheme, (IFilesystemUtility) execExt);
}
} catch (CoreException e) {
CCorePlugin.log(e);
}
}
}
}
}
}
public synchronized static FileSystemUtilityManager getDefault() {
if(instance == null) {
instance = new FileSystemUtilityManager();
}
return instance;
}
/**
* Gets the path out of a URI. Right now this is hardcoded to deal with a select few filesystems.
* In the future, it would be better if EFS had an API for this.
*
* @param locationURI
* @return String representing the path.
*/
public String getPathFromURI(URI locationURI) {
IFilesystemUtility utility = fSchemeToUtilityImplementerMap.get(locationURI.getScheme());
if(utility == null) {
return locationURI.getPath();
}
else {
return utility.getPathFromURI(locationURI);
}
}
/**
* In the case of a managed (linked) filesystem, returns the URI that this URI ultimately will
* point to. Otherwise, returns null.
*
* @param locationURI
* @return URI
*/
public URI getManagedURI(URI locationURI) {
IFilesystemUtility utility = fSchemeToUtilityImplementerMap.get(locationURI.getScheme());
if(utility == null) {
return null;
}
else {
return utility.getBaseURI(locationURI);
}
}
/**
* Creates a new URI which clones the contents of the original URI, but with the path
* replaced by the given path. Returns null on error.
*
* @param uri
* @param path
* @return URI
*/
public URI replacePath(URI uri, String path) {
IFilesystemUtility utility = fSchemeToUtilityImplementerMap.get(uri.getScheme());
if(utility == null) {
// if there is no corresponding utility, then assume we can just replace the path field
try {
return new URI(uri.getScheme(), uri.getUserInfo(), uri.getHost(), uri.getPort(),
path, // replaced!
uri.getQuery(),uri.getFragment());
} catch (URISyntaxException e) {
CCorePlugin.log(e);
}
return null;
}
else {
return utility.replacePathInURI(uri, path);
}
}
}
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