com.diffplug.spotless.extra.eclipse.wtp.sse.PreventExternalURIResolverExtension Maven / Gradle / Ivy

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Eclipse's WTP formatters bundled for Spotless

There is a newer version: 3.23.0

/*
 * Copyright 2016 DiffPlug
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.diffplug.spotless.extra.eclipse.wtp.sse;

import org.eclipse.core.resources.IFile;
import org.eclipse.emf.common.util.URI;
import org.eclipse.wst.common.uriresolver.internal.provisional.URIResolverExtension;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

/**
 * The URI resolver extension
 */
public class PreventExternalURIResolverExtension implements URIResolverExtension, BundleActivator {

	private static final String REFUSE_EXTERNAL_URI = "file://refused.external.uri";

	/**
	 * @param file the in-workspace base resource, if one exists
	 * @param baseLocation - the location of the resource that contains the uri
	 * @param publicId - an optional public identifier (i.e. namespace name), or null if none
	 * @param systemId - an absolute or relative URI, or null if none
	 *
	 * @return an absolute URI or null if this extension can not resolve this reference
	 */
	@Override
	public String resolve(IFile file, String baseLocation, String publicId, String systemId) {
		if (null != systemId) {
			try {
				URI proposalByPreviousResolver = org.eclipse.emf.common.util.URI.createURI(systemId);
				String host = proposalByPreviousResolver.host();
				/*
				 * The host is empty (not null)
				 */
				if (!(null == host || host.isEmpty())) {
					return REFUSE_EXTERNAL_URI;
				}
			} catch (IllegalArgumentException ignore) {
				//If it is no a valid URI, there is nothing to do here.
			}
		}
		return null; //Don't alter the proposal of previous resolver extensions by proposing something else
	}

	@Override
	public void start(BundleContext context) throws Exception {
		//Nothing to do. The bundle-activator interface only allows to load this extension as a stand-alone plugin.
	}

	@Override
	public void stop(BundleContext context) throws Exception {
		//Nothing to do. The bundle-activator interface only allows to load this extension as a stand-alone plugin.
	}

}