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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.properties.catalog;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Map;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.URIHandler;
import org.eclipse.papyrus.infra.properties.internal.InfraPropertiesPlugin;
import org.eclipse.papyrus.infra.properties.spi.IPropertiesResolver;
/**
* A URI Handler for URIs with the ppe:/ scheme
*
* @author Camille Letavernier
*/
public class PropertiesURIHandler implements URIHandler {
/**
* The segment for environment models
*/
public static final String ENVIRONMENT_SEGMENT = "environment"; //$NON-NLS-1$
/**
* The segment for context models
*/
public static final String CONTEXT_SEGMENT = "context"; //$NON-NLS-1$
/**
* The handled URI scheme (ppe)
*/
public static final String PROPERTIES_SCHEME = "ppe"; //$NON-NLS-1$
/**
* {@inheritDoc}
*/
@Override
public boolean canHandle(URI uri) {
return uri != null && PROPERTIES_SCHEME.equals(uri.scheme());
}
/**
* {@inheritDoc}
*/
@Override
public InputStream createInputStream(URI uri, Map<?, ?> options) throws IOException {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
return handler.createInputStream(convertedURI, options);
}
/**
* {@inheritDoc}
*/
@Override
public OutputStream createOutputStream(URI uri, Map<?, ?> options) throws IOException {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
return handler.createOutputStream(convertedURI, options);
}
/**
* {@inheritDoc}
*/
@Override
public void delete(URI uri, Map<?, ?> options) throws IOException {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
handler.delete(convertedURI, options);
}
/**
* {@inheritDoc}
*/
@Override
public Map<String, ?> contentDescription(URI uri, Map<?, ?> options) throws IOException {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
return handler.contentDescription(convertedURI, options);
}
/**
* {@inheritDoc}
*/
@Override
public boolean exists(URI uri, Map<?, ?> options) {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
return handler.exists(convertedURI, options);
}
/**
* {@inheritDoc}
*/
@Override
public Map<String, ?> getAttributes(URI uri, Map<?, ?> options) {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
return handler.getAttributes(convertedURI, options);
}
/**
* {@inheritDoc}
*/
@Override
public void setAttributes(URI uri, Map<String, ?> attributes, Map<?, ?> options) throws IOException {
URI convertedURI = getConvertedURI(uri);
URIHandler handler = getDelegateHandler(convertedURI);
handler.setAttributes(convertedURI, attributes, options);
}
/**
* Returns the URIHandler that can handle the given URI
*
* @param convertedURI
* The URI obtained after converting the ppe:/ URI to a standard URI
* @return
* The URIHandler corresponding to the converted URI
*/
protected URIHandler getDelegateHandler(URI convertedURI) {
if (convertedURI == null) {
return null;
}
for (URIHandler handler : URIHandler.DEFAULT_HANDLERS) {
if (handler.canHandle(convertedURI)) {
return handler;
}
}
return null;
}
/**
* Converts the ppe:/ URI to a standard URI
*
* @param sourceURI
* The ppe:/ URI to convert
* @return
* The standard URI
*/
public URI getConvertedURI(URI sourceURI) {
if (sourceURI == null) {
throw new IllegalArgumentException("sourceURI shall not be null"); //$NON-NLS-1$
}
String firstSegment = sourceURI.segment(0);
URI targetURI = URI.createURI(""); //$NON-NLS-1$
if (firstSegment.equals(ENVIRONMENT_SEGMENT)) {
for (int i = 1; i < sourceURI.segmentsList().size(); i++) {
String segment = sourceURI.segmentsList().get(i);
targetURI = targetURI.appendSegment(segment);
}
} else if (firstSegment.equals(CONTEXT_SEGMENT)) {
for (int i = 1; i < sourceURI.segmentsList().size(); i++) {
String segment = sourceURI.segmentsList().get(i);
targetURI = targetURI.appendSegment(segment);
}
} else {
throw new IllegalArgumentException(sourceURI + " is not a valid URI"); //$NON-NLS-1$
}
URI result = targetURI.resolve(URI.createURI("platform:/plugin/")); //$NON-NLS-1$
if (!exists(result)) {
result = targetURI.resolve(URI.createURI("platform:/resource/")); //$NON-NLS-1$
if (!exists(result)) {
result = null;
// Reach out to the resolver services
for (IPropertiesResolver resolver : InfraPropertiesPlugin.getInstance().getPropertyResolvers()) {
result = resolver.resolve(targetURI);
if (!exists(result)) {
result = null;
} else {
break;
}
}
}
}
return result;
}
private boolean exists(URI uri) {
for (URIHandler handler : DEFAULT_HANDLERS) {
if (handler.canHandle(uri)) {
return handler.exists(uri, Collections.EMPTY_MAP);
}
}
return false;
}
}
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