JAL-3026 srcjar files for VARNA and log4j

[jalview.git] / srcjar / org / apache / log4j / helpers / PatternConverter.java

diff --git a/srcjar/org/apache/log4j/helpers/PatternConverter.java b/srcjar/org/apache/log4j/helpers/PatternConverter.java
new file mode 100644 (file)
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+++ b/srcjar/org/apache/log4j/helpers/PatternConverter.java
@@ -0,0 +1,112 @@
+/*
+ * 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.LoggingEvent;
+
+/**
+
+   <p>PatternConverter is an abtract class that provides the
+   formatting functionality that derived classes need.
+
+   <p>Conversion specifiers in a conversion patterns are parsed to
+   individual PatternConverters. Each of which is responsible for
+   converting a logging event in a converter specific manner.
+
+   @author <a href="mailto:cakalijp@Maritz.com">James P. Cakalic</a>
+   @author Ceki G&uuml;lc&uuml;
+
+   @since 0.8.2
+ */
+public abstract class PatternConverter {
+  public PatternConverter next;
+  int min = -1;
+  int max = 0x7FFFFFFF;
+  boolean leftAlign = false;
+
+  protected
+  PatternConverter() {  }
+  
+  protected
+  PatternConverter(FormattingInfo fi) {
+    min = fi.min;
+    max = fi.max;
+    leftAlign = fi.leftAlign;
+  }
+
+  /**
+     Derived pattern converters must override this method in order to
+     convert conversion specifiers in the correct way.
+  */
+  abstract
+  protected
+  String convert(LoggingEvent event);
+
+  /**
+     A template method for formatting in a converter specific way.
+   */
+  public
+  void format(StringBuffer sbuf, LoggingEvent e) {
+    String s = convert(e);
+
+    if(s == null) {
+      if(0 < min) {
+        spacePad(sbuf, min);
+    }
+      return;
+    }
+
+    int len = s.length();
+
+    if(len > max) {
+        sbuf.append(s.substring(len-max));
+    } else if(len < min) {
+      if(leftAlign) {  
+       sbuf.append(s);
+       spacePad(sbuf, min-len);
+      }
+      else {
+       spacePad(sbuf, min-len);
+       sbuf.append(s);
+      }
+    } else {
+        sbuf.append(s);
+    }
+  }    
+
+  static String[] SPACES = {" ", "  ", "    ", "        ", //1,2,4,8 spaces
+                           "                ", // 16 spaces
+                           "                                " }; // 32 spaces
+
+  /**
+     Fast space padding method.
+  */
+  public
+  void spacePad(StringBuffer sbuf, int length) {
+    while(length >= 32) {
+      sbuf.append(SPACES[5]);
+      length -= 32;
+    }
+    
+    for(int i = 4; i >= 0; i--) {      
+      if((length & (1<<i)) != 0) {
+       sbuf.append(SPACES[i]);
+      }
+    }
+  }
+}