org.apache.log4j.helpers.QuietWriter Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.log4j.helpers;
import java.io.FilterWriter;
import java.io.Writer;
import org.apache.log4j.spi.ErrorCode;
import org.apache.log4j.spi.ErrorHandler;
/**
* QuietWriter does not throw exceptions when things go
* wrong. Instead, it delegates error handling to its {@link ErrorHandler}.
*/
public class QuietWriter extends FilterWriter {
protected ErrorHandler errorHandler;
public QuietWriter(Writer writer, ErrorHandler errorHandler) {
super(writer);
setErrorHandler(errorHandler);
}
@Override
public void write(String string) {
if (string != null) {
try {
out.write(string);
} catch (Exception e) {
errorHandler.error("Failed to write [" + string + "].", e,
ErrorCode.WRITE_FAILURE);
}
}
}
@Override
public void flush() {
try {
out.flush();
} catch (Exception e) {
errorHandler.error("Failed to flush writer,", e,
ErrorCode.FLUSH_FAILURE);
}
}
public void setErrorHandler(ErrorHandler eh) {
if (eh == null) {
// This is a programming error on the part of the enclosing appender.
throw new IllegalArgumentException("Attempted to set null ErrorHandler.");
}
this.errorHandler = eh;
}
}