JAL-3026 srcjar files for VARNA and log4j

[jalview.git] / srcjar / org / apache / log4j / pattern / BridgePatternConverter.java

diff --git a/srcjar/org/apache/log4j/pattern/BridgePatternConverter.java b/srcjar/org/apache/log4j/pattern/BridgePatternConverter.java
new file mode 100644 (file)
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+++ b/srcjar/org/apache/log4j/pattern/BridgePatternConverter.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.pattern;
+
+import org.apache.log4j.spi.LoggingEvent;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+
+/**
+ * The class implements the pre log4j 1.3 org.apache.log4j.helpers.PatternConverter
+ * contract by delegating to the log4j 1.3 pattern implementation.
+ *
+ *
+ * @author Curt Arnold
+ *
+ */
+public final class BridgePatternConverter
+  extends org.apache.log4j.helpers.PatternConverter {
+  /**
+   * Pattern converters.
+   */
+  private LoggingEventPatternConverter[] patternConverters;
+
+  /**
+   * Field widths and alignment corresponding to pattern converters.
+   */
+  private FormattingInfo[] patternFields;
+
+  /**
+   * Does pattern process exceptions.
+   */
+  private boolean handlesExceptions;
+
+  /**
+   * Create a new instance.
+   * @param pattern pattern, may not be null.
+   */
+  public BridgePatternConverter(
+    final String pattern) {
+    next = null;
+    handlesExceptions = false;
+
+    List converters = new ArrayList();
+    List fields = new ArrayList();
+    Map converterRegistry = null;
+
+    PatternParser.parse(
+      pattern, converters, fields, converterRegistry,
+      PatternParser.getPatternLayoutRules());
+
+    patternConverters = new LoggingEventPatternConverter[converters.size()];
+    patternFields = new FormattingInfo[converters.size()];
+
+    int i = 0;
+    Iterator converterIter = converters.iterator();
+    Iterator fieldIter = fields.iterator();
+
+    while (converterIter.hasNext()) {
+      Object converter = converterIter.next();
+
+      if (converter instanceof LoggingEventPatternConverter) {
+        patternConverters[i] = (LoggingEventPatternConverter) converter;
+        handlesExceptions |= patternConverters[i].handlesThrowable();
+      } else {
+        patternConverters[i] =
+          new org.apache.log4j.pattern.LiteralPatternConverter("");
+      }
+
+      if (fieldIter.hasNext()) {
+        patternFields[i] = (FormattingInfo) fieldIter.next();
+      } else {
+        patternFields[i] = FormattingInfo.getDefault();
+      }
+
+      i++;
+    }
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  protected String convert(final LoggingEvent event) {
+    //
+    //  code should be unreachable.
+    //
+    StringBuffer sbuf = new StringBuffer();
+    format(sbuf, event);
+
+    return sbuf.toString();
+  }
+
+  /**
+     Format event to string buffer.
+     @param sbuf string buffer to receive formatted event, may not be null.
+     @param e event to format, may not be null.
+   */
+  public void format(final StringBuffer sbuf, final LoggingEvent e) {
+    for (int i = 0; i < patternConverters.length; i++) {
+      int startField = sbuf.length();
+      patternConverters[i].format(e, sbuf);
+      patternFields[i].format(startField, sbuf);
+    }
+  }
+
+  /**
+   * Will return false if any of the conversion specifiers in the pattern
+   * handles {@link Exception Exceptions}.
+   * @return true if the pattern formats any information from exceptions.
+   */
+  public boolean ignoresThrowable() {
+    return !handlesExceptions;
+  }
+}