/*******************************************************************************
* Copyright (c) 2008, 2015 Angelo Zerr 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:
* Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
* IBM Corporation - ongoing development
*******************************************************************************/
package org.eclipse.e4.ui.css.core.util.impl.resources;
import java.io.InputStream;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.e4.ui.css.core.util.resources.IResourceLocator;
import org.eclipse.e4.ui.css.core.util.resources.IResourcesLocatorManager;
import org.eclipse.e4.ui.css.core.utils.StringUtils;
/**
* Resources locator manager implementation.
*/
public class ResourcesLocatorManager implements IResourcesLocatorManager {
/**
* ResourcesLocatorManager Singleton
*/
public static final IResourcesLocatorManager INSTANCE = new ResourcesLocatorManager();
/**
* List of IResourceLocator instance which was registered.
*/
private List<IResourceLocator> uriResolvers;
public ResourcesLocatorManager() {
registerResourceLocator(new HttpResourcesLocatorImpl());
}
@Override
public void registerResourceLocator(IResourceLocator resourceLocator) {
if (uriResolvers == null) {
uriResolvers = new ArrayList<>();
}
if (resourceLocator instanceof OSGiResourceLocator) {
uriResolvers.add(0, resourceLocator);
} else {
uriResolvers.add(resourceLocator);
}
}
@Override
public void unregisterResourceLocator(IResourceLocator resourceLocator) {
if (uriResolvers == null) {
return;
}
uriResolvers.remove(resourceLocator);
}
@Override
public String resolve(String uri) {
if (StringUtils.isEmpty(uri)) {
return null;
}
if (uriResolvers == null) {
return null;
}
// Loop for IResourceLocator registered and return the uri resolved
// as soon as an IResourceLocator return an uri resolved which is not
// null.
for (IResourceLocator resolver : uriResolvers) {
String s = resolver.resolve(uri);
if (s != null) {
return s;
}
}
return null;
}
@Override
public InputStream getInputStream(String uri) throws Exception {
if (StringUtils.isEmpty(uri)) {
return null;
}
if (uriResolvers == null) {
return null;
}
// Loop for IResourceLocator registered and return the InputStream from
// the uri resolved
// as soon as an IResourceLocator return an uri resolved which is not
// null.
for (IResourceLocator resolver : uriResolvers) {
String s = resolver.resolve(uri);
if (s != null) {
InputStream inputStream = resolver.getInputStream(uri);
if (inputStream != null) {
return inputStream;
}
}
}
return null;
}
@Override
public Reader getReader(String uri) throws Exception {
if (StringUtils.isEmpty(uri)) {
return null;
}
if (uriResolvers == null) {
return null;
}
// Loop for IResourceLocator registered and return the Reader from
// the uri resolved
// as soon as an IResourceLocator return an uri resolved which is not
// null.
for (IResourceLocator resolver : uriResolvers) {
String s = resolver.resolve(uri);
if (s != null) {
Reader reader = resolver.getReader(uri);
if (reader != null) {
return reader;
}
}
}
return null;
}
}