JAL-3026 srcjar files for VARNA and log4j

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

diff --git a/srcjar/org/apache/log4j/helpers/AbsoluteTimeDateFormat.java b/srcjar/org/apache/log4j/helpers/AbsoluteTimeDateFormat.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 java.util.Date;
+import java.util.Calendar;
+import java.util.TimeZone;
+import java.text.FieldPosition;
+import java.text.ParsePosition;
+import java.text.DateFormat;
+
+
+/**
+   Formats a {@link Date} in the format "HH:mm:ss,SSS" for example,
+   "15:49:37,459".
+   
+   @author Ceki Gülcü
+   @author Andrew Vajoczki    
+
+   @since 0.7.5
+*/
+public class AbsoluteTimeDateFormat extends DateFormat {
+   private static final long serialVersionUID = -388856345976723342L;
+
+  /**
+     String constant used to specify {@link
+     org.apache.log4j.helpers.AbsoluteTimeDateFormat} in layouts. Current
+     value is <b>ABSOLUTE</b>.  */
+  public final static String ABS_TIME_DATE_FORMAT = "ABSOLUTE";
+
+  /**
+     String constant used to specify {@link
+     org.apache.log4j.helpers.DateTimeDateFormat} in layouts.  Current
+     value is <b>DATE</b>.
+  */
+  public final static String DATE_AND_TIME_DATE_FORMAT = "DATE";
+
+  /**
+     String constant used to specify {@link
+     org.apache.log4j.helpers.ISO8601DateFormat} in layouts. Current
+     value is <b>ISO8601</b>.
+  */
+  public final static String ISO8601_DATE_FORMAT = "ISO8601";
+
+  public
+  AbsoluteTimeDateFormat() {
+    setCalendar(Calendar.getInstance());
+  }
+  
+  public
+  AbsoluteTimeDateFormat(TimeZone timeZone) {
+    setCalendar(Calendar.getInstance(timeZone));
+  }
+
+  private static long   previousTime;
+  private static char[] previousTimeWithoutMillis = new char[9]; // "HH:mm:ss."
+
+  /**
+     Appends to <code>sbuf</code> the time in the format
+     "HH:mm:ss,SSS" for example, "15:49:37,459"
+
+     @param date the date to format
+     @param sbuf the string buffer to write to
+     @param fieldPosition remains untouched
+    */
+  public
+  StringBuffer format(Date date, StringBuffer sbuf,
+                     FieldPosition fieldPosition) {
+
+    long now = date.getTime();
+    int millis = (int)(now % 1000);
+
+    if ((now - millis) != previousTime || previousTimeWithoutMillis[0] == 0) {
+      // We reach this point at most once per second
+      // across all threads instead of each time format()
+      // is called. This saves considerable CPU time.
+
+      calendar.setTime(date);
+
+      int start = sbuf.length();
+      
+      int hour = calendar.get(Calendar.HOUR_OF_DAY);
+      if(hour < 10) {
+       sbuf.append('0');
+      }
+      sbuf.append(hour);
+      sbuf.append(':');
+      
+      int mins = calendar.get(Calendar.MINUTE);
+      if(mins < 10) {
+       sbuf.append('0');
+      }
+      sbuf.append(mins);
+      sbuf.append(':');
+      
+      int secs = calendar.get(Calendar.SECOND);
+      if(secs < 10) {
+       sbuf.append('0');
+      }
+      sbuf.append(secs);
+      sbuf.append(',');      
+
+      // store the time string for next time to avoid recomputation
+      sbuf.getChars(start, sbuf.length(), previousTimeWithoutMillis, 0);
+      
+      previousTime = now - millis;
+    }
+    else {
+      sbuf.append(previousTimeWithoutMillis);
+    }
+    
+
+    
+    if(millis < 100) {
+        sbuf.append('0');
+    }
+    if(millis < 10) {
+        sbuf.append('0');
+    }
+    
+    sbuf.append(millis);
+    return sbuf;
+  }
+
+  /**
+     This method does not do anything but return <code>null</code>.
+   */
+  public
+  Date parse(String s, ParsePosition pos) {
+    return null;
+  }  
+}