org.aesh.utils.ExecHelper Maven / Gradle / Ivy
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* Copyright 2014 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.aesh.utils;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Helper methods for capturing an external process output.
*
* @author Guillaume Nodet
*/
public final class ExecHelper {
private ExecHelper() {
}
public static String waitAndCapture(Process p) throws IOException, InterruptedException {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
InputStream in = null;
InputStream err = null;
OutputStream out = null;
try {
int c;
in = p.getInputStream();
while ((c = in.read()) != -1) {
bout.write(c);
}
err = p.getErrorStream();
while ((c = err.read()) != -1) {
bout.write(c);
}
out = p.getOutputStream();
p.waitFor();
}
finally {
close(in, out, err);
}
return bout.toString();
}
private static void close(final Closeable... closeables) {
for (Closeable c : closeables) {
if (c != null) {
try {
c.close();
} catch (Exception e) {
// Ignore
}
}
}
}
}