JAL-3253 srcjar_unused/ moved to unused/

[jalview.git] / unused / srcjar_unused / org / apache / log4j / helpers / QuietWriter.java

diff --git a/unused/srcjar_unused/org/apache/log4j/helpers/QuietWriter.java b/unused/srcjar_unused/org/apache/log4j/helpers/QuietWriter.java
new file mode 100644 (file)
index 0000000..778f091
--- /dev/null
+++ b/unused/srcjar_unused/org/apache/log4j/helpers/QuietWriter.java
@@ -0,0 +1,76 @@
+/*
+ * 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;
+    }
+  }
+}