+/*
+ * 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.Writer;
+import java.io.FilterWriter;
+import org.apache.log4j.spi.ErrorHandler;
+import org.apache.log4j.spi.ErrorCode;
+
+
+/**
+ QuietWriter does not throw exceptions when things go
+ wrong. Instead, it delegates error handling to its {@link ErrorHandler}.
+
+ @author Ceki Gülcü
+
+ @since 0.7.3
+*/
+public class QuietWriter extends FilterWriter {
+
+ protected ErrorHandler errorHandler;
+
+ public
+ QuietWriter(Writer writer, ErrorHandler errorHandler) {
+ super(writer);
+ setErrorHandler(errorHandler);
+ }
+
+ 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);
+ }
+ }
+ }
+
+ 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.");
+ } else {
+ this.errorHandler = eh;
+ }
+ }
+}