org.eclipse.osgi.storage.url.BundleURLConnection Maven / Gradle / Ivy

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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2004, 2021 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Hannes Wellmann - Bug 576644: Implement BundleReference for BundleURLConnection
 *******************************************************************************/

package org.eclipse.osgi.storage.url;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.eclipse.osgi.container.Module;
import org.eclipse.osgi.container.ModuleContainer;
import org.eclipse.osgi.internal.messages.Msg;
import org.eclipse.osgi.storage.bundlefile.BundleEntry;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleReference;

/**
 * URLConnection for BundleClassLoader resources.
 */
public class BundleURLConnection extends URLConnection implements BundleReference {
	/** BundleEntry that the URL is associated. */
	protected final BundleEntry bundleEntry;

	private final ModuleContainer container;

	/** InputStream for this URLConnection. */
	protected InputStream in;

	/** content type for this URLConnection */
	protected String contentType;

	/**
	 * Constructor for a BundleClassLoader resource URLConnection.
	 *
	 * @param url  URL for this URLConnection.
	 * @param bundleEntry  BundleEntry that the URLConnection is associated.
	 */
	public BundleURLConnection(URL url, ModuleContainer container, BundleEntry bundleEntry) {
		super(url);

		this.container = container;
		this.bundleEntry = bundleEntry;
		this.in = null;
		this.contentType = null;
	}

	@Override
	public synchronized void connect() throws IOException {
		if (!connected) {
			if (bundleEntry != null) {
				in = bundleEntry.getInputStream();
				connected = true;
			} else {
				throw new IOException(NLS.bind(Msg.RESOURCE_NOT_FOUND_EXCEPTION, getURL()));
			}
		}
	}

	@Override
	public long getContentLengthLong() {
		return bundleEntry.getSize();
	}

	@Override
	public String getContentType() {
		if (contentType == null) {
			contentType = guessContentTypeFromName(bundleEntry.getName());

			if (contentType == null) {
				if (!connected) {
					try {
						connect();
					} catch (IOException e) {
						return null;
					}
				}
				try {
					if (in.markSupported())
						contentType = guessContentTypeFromStream(in);
				} catch (IOException e) {
					// do nothing
				}
			}
		}
		return contentType;
	}

	@Override
	public boolean getDoInput() {
		return true;
	}

	@Override
	public boolean getDoOutput() {
		return false;
	}

	@Override
	public InputStream getInputStream() throws IOException {
		if (!connected) {
			connect();
		}
		return in;
	}

	@Override
	public long getLastModified() {
		long lastModified = bundleEntry.getTime();

		if (lastModified == -1) {
			return (0);
		}
		return lastModified;
	}

	/**
	 * Converts the URL to a common local URL protocol (i.e file: or jar: protocol)
	 * @return the local URL using a common local protocol
	 */
	public URL getLocalURL() {
		URL local = bundleEntry.getLocalURL();
		return local == null ? getURL() : local;
	}

	/**
	 * Converts the URL to a URL that uses the file: protocol.  The content of this
	 * URL may be downloaded or extracted onto the local filesystem to create a file URL.
	 * @return the local URL that uses the file: protocol
	 */
	public URL getFileURL() {
		return bundleEntry.getFileURL();
	}

	@Override
	public Bundle getBundle() {
		String host = getURL().getHost();
		long bundleId = BundleResourceHandler.parseBundleIDFromURLHost(host);
		Module module = container.getModule(bundleId);
		return module != null ? module.getBundle() : null;
	}
}