/*******************************************************************************
* Copyright (c) 2012-2017 Codenvy, S.A.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.eclipse.che.api.core.util;
import java.io.IOException;
import static org.eclipse.che.api.core.util.ErrorFilteredConsumer.ErrorIndicator.DEFAULT_ERROR_INDICATOR;
/**
* Consumes all output and redirect to another consumer
* only those lines which contain errors.
*
* @author Anatolii Bazko
*/
public class ErrorFilteredConsumer implements LineConsumer {
private final ErrorIndicator errorIndicator;
private final LineConsumer lineConsumer;
public ErrorFilteredConsumer(ErrorIndicator errorIndicator, LineConsumer lineConsumer) {
this.errorIndicator = errorIndicator;
this.lineConsumer = lineConsumer;
}
public ErrorFilteredConsumer(LineConsumer lineConsumer) {
this(DEFAULT_ERROR_INDICATOR, lineConsumer);
}
@Override
public void writeLine(String line) throws IOException {
if (errorIndicator.isError(line)) {
lineConsumer.writeLine(line);
}
}
@Override
public void close() throws IOException {
lineConsumer.close();
}
/**
* Indicates if line contains a error message.
*/
@FunctionalInterface
public interface ErrorIndicator {
boolean isError(String line);
ErrorIndicator DEFAULT_ERROR_INDICATOR = line -> line.startsWith("[STDERR]");
}
}