+/*
+ * 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;
+
+import org.apache.log4j.spi.ThrowableRenderer;
+
+import java.io.StringWriter;
+import java.io.PrintWriter;
+import java.io.LineNumberReader;
+import java.io.StringReader;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.util.ArrayList;
+
+/**
+ * Default implementation of ThrowableRenderer using
+ * Throwable.printStackTrace.
+ *
+ * @since 1.2.16
+ */
+public final class DefaultThrowableRenderer implements ThrowableRenderer {
+ /**
+ * Construct new instance.
+ */
+ public DefaultThrowableRenderer() {
+
+ }
+
+
+ /**
+ * {@inheritDoc}
+ */
+ public String[] doRender(final Throwable throwable) {
+ return render(throwable);
+ }
+
+ /**
+ * Render throwable using Throwable.printStackTrace.
+ * @param throwable throwable, may not be null.
+ * @return string representation.
+ */
+ public static String[] render(final Throwable throwable) {
+ StringWriter sw = new StringWriter();
+ PrintWriter pw = new PrintWriter(sw);
+ try {
+ throwable.printStackTrace(pw);
+ } catch(RuntimeException ex) {
+ }
+ pw.flush();
+ LineNumberReader reader = new LineNumberReader(
+ new StringReader(sw.toString()));
+ ArrayList lines = new ArrayList();
+ try {
+ String line = reader.readLine();
+ while(line != null) {
+ lines.add(line);
+ line = reader.readLine();
+ }
+ } catch(IOException ex) {
+ if (ex instanceof InterruptedIOException) {
+ Thread.currentThread().interrupt();
+ }
+ lines.add(ex.toString());
+ }
+ String[] tempRep = new String[lines.size()];
+ lines.toArray(tempRep);
+ return tempRep;
+ }
+}