+/*
+ * 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;
+ }
+}