Merge branch 'Jalview-JS/develop' into develop

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

diff --git a/srcjar_unused/org/apache/log4j/helpers/OnlyOnceErrorHandler.java b/srcjar_unused/org/apache/log4j/helpers/OnlyOnceErrorHandler.java
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+/*
+ * 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  org.apache.log4j.spi.ErrorHandler;
+import  org.apache.log4j.spi.LoggingEvent;
+import  org.apache.log4j.Logger;
+import  org.apache.log4j.Appender;
+
+import java.io.InterruptedIOException;
+
+/**
+
+   The <code>OnlyOnceErrorHandler</code> implements log4j's default
+   error handling policy which consists of emitting a message for the
+   first error in an appender and ignoring all following errors.
+
+   <p>The error message is printed on <code>System.err</code>. 
+
+   <p>This policy aims at protecting an otherwise working application
+   from being flooded with error messages when logging fails.
+
+   @author Ceki G&uuml;lc&uuml;
+   @since 0.9.0 */
+public class OnlyOnceErrorHandler implements ErrorHandler {
+
+
+  final String WARN_PREFIX = "log4j warning: ";
+  final String ERROR_PREFIX = "log4j error: ";
+
+  boolean firstTime = true;
+
+
+  /**
+     Does not do anything.
+   */
+  public 
+  void setLogger(Logger logger) {
+  }
+
+
+  /**
+     No options to activate.
+  */
+  public 
+  void activateOptions() {
+  }
+
+
+  /**
+     Prints the message and the stack trace of the exception on
+     <code>System.err</code>.  */
+  public
+  void error(String message, Exception e, int errorCode) { 
+    error(message, e, errorCode, null);
+  }
+
+  /**
+     Prints the message and the stack trace of the exception on
+     <code>System.err</code>.
+   */
+  public
+  void error(String message, Exception e, int errorCode, LoggingEvent event) {
+    if (e instanceof InterruptedIOException || e instanceof InterruptedException) {
+        Thread.currentThread().interrupt();
+    }
+    if(firstTime) {
+      LogLog.error(message, e);
+      firstTime = false;
+    }
+  }
+
+
+  /**
+     Print a the error message passed as parameter on
+     <code>System.err</code>.  
+  */
+  public 
+  void error(String message) {
+    if(firstTime) {
+      LogLog.error(message);
+      firstTime = false;
+    }
+  }
+  
+  /**
+     Does not do anything.
+   */
+  public
+  void setAppender(Appender appender) {
+  }
+
+  /**
+     Does not do anything.
+   */
+  public
+  void setBackupAppender(Appender appender) {
+  }
+}