/* * Copyright (C) The Apache Software Foundation. All rights reserved. * * This software is published under the terms of the Apache Software License * version 1.1, a copy of which has been included with this distribution in * the LICENSE file. */ package org.jivesoftware.util.log.output.io; import org.jivesoftware.util.log.format.Formatter; import org.jivesoftware.util.log.output.AbstractOutputTarget; import java.io.IOException; import java.io.Writer; /** * This target outputs to a writer. * * @author <a href="mailto:peter@apache.org">Peter Donald</a> */ public class WriterTarget extends AbstractOutputTarget { private Writer m_output; /** * Construct target with a specific writer and formatter. * * @param writer the writer * @param formatter the formatter */ public WriterTarget(final Writer writer, final Formatter formatter) { super(formatter); if (null != writer) { setWriter(writer); open(); } } /** * Set the writer. * Close down writer and send tail if appropriate. * * @param writer the new writer */ protected synchronized void setWriter(final Writer writer) { if (null == writer) { throw new NullPointerException("writer property must not be null"); } m_output = writer; } /** * Concrete implementation of output that writes out to underlying writer. * * @param data the data to output */ protected void write(final String data) { try { m_output.write(data); m_output.flush(); } catch (final IOException ioe) { getErrorHandler().error("Caught an IOException", ioe, null); } } /** * Shutdown target. * Attempting to send to target after close() will cause errors to be logged. */ public synchronized void close() { super.close(); shutdownWriter(); } /** * Shutdown Writer. */ protected synchronized void shutdownWriter() { final Writer writer = m_output; m_output = null; try { if (null != writer) { writer.close(); } } catch (final IOException ioe) { getErrorHandler().error("Error closing Writer", ioe, null); } } }