--- /dev/null
+/*
+ * 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 java.io.IOException;
+import java.io.OutputStream;
+import org.apache.log4j.helpers.LogLog;
+
+/**
+ * ConsoleAppender appends log events to <code>System.out</code> or
+ * <code>System.err</code> using a layout specified by the user. The
+ * default target is <code>System.out</code>.
+ *
+ * @author Ceki Gülcü
+ * @author Curt Arnold
+ * @since 1.1 */
+public class ConsoleAppender extends WriterAppender {
+
+ public static final String SYSTEM_OUT = "System.out";
+ public static final String SYSTEM_ERR = "System.err";
+
+ protected String target = SYSTEM_OUT;
+
+ /**
+ * Determines if the appender honors reassignments of System.out
+ * or System.err made after configuration.
+ */
+ private boolean follow = false;
+
+ /**
+ * Constructs an unconfigured appender.
+ */
+ public ConsoleAppender() {
+ }
+
+ /**
+ * Creates a configured appender.
+ *
+ * @param layout layout, may not be null.
+ */
+ public ConsoleAppender(Layout layout) {
+ this(layout, SYSTEM_OUT);
+ }
+
+ /**
+ * Creates a configured appender.
+ * @param layout layout, may not be null.
+ * @param target target, either "System.err" or "System.out".
+ */
+ public ConsoleAppender(Layout layout, String target) {
+ setLayout(layout);
+ setTarget(target);
+ activateOptions();
+ }
+
+ /**
+ * Sets the value of the <b>Target</b> option. Recognized values
+ * are "System.out" and "System.err". Any other value will be
+ * ignored.
+ * */
+ public
+ void setTarget(String value) {
+ String v = value.trim();
+
+ if (SYSTEM_OUT.equalsIgnoreCase(v)) {
+ target = SYSTEM_OUT;
+ } else if (SYSTEM_ERR.equalsIgnoreCase(v)) {
+ target = SYSTEM_ERR;
+ } else {
+ targetWarn(value);
+ }
+ }
+
+ /**
+ * Returns the current value of the <b>Target</b> property. The
+ * default value of the option is "System.out".
+ *
+ * See also {@link #setTarget}.
+ * */
+ public
+ String getTarget() {
+ return target;
+ }
+
+ /**
+ * Sets whether the appender honors reassignments of System.out
+ * or System.err made after configuration.
+ * @param newValue if true, appender will use value of System.out or
+ * System.err in force at the time when logging events are appended.
+ * @since 1.2.13
+ */
+ public final void setFollow(final boolean newValue) {
+ follow = newValue;
+ }
+
+ /**
+ * Gets whether the appender honors reassignments of System.out
+ * or System.err made after configuration.
+ * @return true if appender will use value of System.out or
+ * System.err in force at the time when logging events are appended.
+ * @since 1.2.13
+ */
+ public final boolean getFollow() {
+ return follow;
+ }
+
+ void targetWarn(String val) {
+ LogLog.warn("["+val+"] should be System.out or System.err.");
+ LogLog.warn("Using previously set target, System.out by default.");
+ }
+
+ /**
+ * Prepares the appender for use.
+ */
+ public void activateOptions() {
+ if (follow) {
+ if (target.equals(SYSTEM_ERR)) {
+ setWriter(createWriter(new SystemErrStream()));
+ } else {
+ setWriter(createWriter(new SystemOutStream()));
+ }
+ } else {
+ if (target.equals(SYSTEM_ERR)) {
+ setWriter(createWriter(System.err));
+ } else {
+ setWriter(createWriter(System.out));
+ }
+ }
+
+ super.activateOptions();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ protected
+ final
+ void closeWriter() {
+ if (follow) {
+ super.closeWriter();
+ }
+ }
+
+
+ /**
+ * An implementation of OutputStream that redirects to the
+ * current System.err.
+ *
+ */
+ private static class SystemErrStream extends OutputStream {
+ public SystemErrStream() {
+ }
+
+ public void close() {
+ }
+
+ public void flush() {
+ System.err.flush();
+ }
+
+ public void write(final byte[] b) throws IOException {
+ System.err.write(b);
+ }
+
+ public void write(final byte[] b, final int off, final int len)
+ throws IOException {
+ System.err.write(b, off, len);
+ }
+
+ public void write(final int b) throws IOException {
+ System.err.write(b);
+ }
+ }
+
+ /**
+ * An implementation of OutputStream that redirects to the
+ * current System.out.
+ *
+ */
+ private static class SystemOutStream extends OutputStream {
+ public SystemOutStream() {
+ }
+
+ public void close() {
+ }
+
+ public void flush() {
+ System.out.flush();
+ }
+
+ public void write(final byte[] b) throws IOException {
+ System.out.write(b);
+ }
+
+ public void write(final byte[] b, final int off, final int len)
+ throws IOException {
+ System.out.write(b, off, len);
+ }
+
+ public void write(final int b) throws IOException {
+ System.out.write(b);
+ }
+ }
+
+}
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