org.wildfly.extras.patch.installer.Support Maven / Gradle / Ivy
/*
* #%L
* Fuse EAP :: Installer
* %%
* Copyright (C) 2015 RedHat
* %%
* 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.
* #L%
*/
package org.wildfly.extras.patch.installer;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.CRC32;
final class Support {
static String getJavaFile() throws IOException {
String home = System.getProperty("java.home");
if (home != null) {
File file = new File(home, "bin/java");
if (file.exists() && file.canExecute()) {
return file.getCanonicalPath();
}
}
return "java";
}
static void pump(InputStream distro, OutputStream fos) throws IOException {
int len;
byte[] buffer = new byte[1024 * 4];
while ((len = distro.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
}
static Thread startPump(final InputStream is, final OutputStream os) {
Thread thread = new Thread("io") {
@Override
public void run() {
try {
pump(is, os);
} catch (IOException e) {
}
}
};
thread.start();
return thread;
}
static long computeCRC32(File file) throws IOException {
CRC32 crc32 = new CRC32();
try (FileInputStream is = new FileInputStream(file)) {
int len;
byte[] buffer = new byte[1024 * 4];
while ((len = is.read(buffer)) > 0) {
crc32.update(buffer, 0, len);
}
}
return crc32.getValue();
}
static Process exec(String[] args, File dir) throws IOException, InterruptedException {
Process process = Runtime.getRuntime().exec(args, null, dir);
startPump(process.getInputStream(), System.out);
startPump(process.getErrorStream(), System.err);
return process;
}
}