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/*******************************************************************************
* Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.agent;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
/**
* API to access the agent JAR file as a resource. While the agent is a JAR file
* it is considered as a plain resource that must be configured for the
* application under test (target JVM). The agent JAR does not provide any
* public Java API.
*/
public final class AgentJar {
/**
* Name of the agent JAR file resource within this bundle.
*/
private static final String RESOURCE = "/jacocoagent.jar";
private AgentJar() {
}
/**
* Returns a URL pointing to the JAR file.
*
* @return URL of the JAR file
*/
public static URL getResource() {
final URL url = AgentJar.class.getResource(RESOURCE);
if (url == null) {
throw new AssertionError(ERRORMSG);
}
return url;
}
/**
* Returns the content of the JAR file as a stream.
*
* @return content of the JAR file
*/
public static InputStream getResourceAsStream() {
final InputStream stream = AgentJar.class.getResourceAsStream(RESOURCE);
if (stream == null) {
throw new AssertionError(ERRORMSG);
}
return stream;
}
/**
* Extract the JaCoCo agent JAR and put it into a temporary location. This
* file should be deleted on exit, but may not if the VM is terminated
*
* @return Location of the Agent Jar file in the local file system. The file
* should exist and be readable.
* @throws IOException
* Unable to unpack agent jar
*/
public static File extractToTempLocation() throws IOException {
final File agentJar = File.createTempFile("jacocoagent", ".jar");
agentJar.deleteOnExit();
extractTo(agentJar);
return agentJar;
}
/**
* Extract the JaCoCo agent JAR and put it into the specified location.
*
* @param destination
* Location to write JaCoCo Agent Jar to. Must be writeable
* @throws IOException
* Unable to unpack agent jar
*/
public static void extractTo(File destination) throws IOException {
InputStream inputJarStream = getResourceAsStream();
OutputStream outputJarStream = null;
try {
outputJarStream = new FileOutputStream(destination);
final byte[] buffer = new byte[8192];
int bytesRead;
while ((bytesRead = inputJarStream.read(buffer)) != -1) {
outputJarStream.write(buffer, 0, bytesRead);
}
} finally {
safeClose(inputJarStream);
safeClose(outputJarStream);
}
}
/**
* Close a stream ignoring any error
*
* @param closeable
* stream to be closed
*/
private static void safeClose(Closeable closeable) {
try {
if (closeable != null) {
closeable.close();
}
} catch (IOException e) {
}
}
private static final String ERRORMSG = String
.format("The resource %s has not been found. Please see "
+ "/org.jacoco.agent/README.TXT for details.", RESOURCE);
}
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