com.google.gdt.eclipse.designer.hosted.tdz.log.LogSupport.java Source code

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Here is the source code for com.google.gdt.eclipse.designer.hosted.tdz.log.LogSupport.java

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/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * 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 com.google.gdt.eclipse.designer.hosted.tdz.log;

import java.io.File;
import java.io.FilterWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import org.apache.commons.lang.StringUtils;
import org.eclipse.jdt.core.IJavaProject;

import com.google.gdt.eclipse.designer.hosted.ILogSupport;
import com.google.gdt.eclipse.designer.hosted.log.RotatingFileWriter;
import com.google.gdt.eclipse.designer.hosted.tdz.HostedModeSupport;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.dev.util.log.AbstractTreeLogger;
import com.google.gwt.dev.util.log.PrintWriterTreeLogger;

/**
 * Implementation of {@link ILogSupport} for GWT.
 * 
 * @author mitin_aa
 */
public final class LogSupport implements ILogSupport {
    private static final String ERROR_TYPE_LABEL = "[" + TreeLogger.ERROR.getLabel() + "]";
    private static final String LINE_SEPARATOR = System.getProperty("line.separator");
    private static final TreeLogger.Type[] TREE_LOGGER_TYPES = { TreeLogger.ERROR, TreeLogger.WARN, TreeLogger.INFO,
            TreeLogger.TRACE, TreeLogger.DEBUG, TreeLogger.SPAM, TreeLogger.ALL };
    private final PrintWriter m_writer;
    private final TreeLogger m_logger;
    private String m_errors = "";

    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    public LogSupport(TreeLogger.Type type, IJavaProject javaProject) throws Exception {
        if ("true".equalsIgnoreCase(System.getProperty(WBP_TESTING_TIME))) {
            m_logger = TreeLogger.NULL;
            m_writer = null;
        } else {
            // prepare directory to write log files to
            String logDir = HostedModeSupport.getTemporaryDirectoryName(javaProject);
            // prepare logger
            Writer rotatingWriter = RotatingFileWriter.getInstance(logDir + File.separator + ".gwt-log", 10, 3);
            m_writer = new PrintWriter(new FilterWriter(rotatingWriter) {
                private String m_buffer = new String();

                @Override
                public void write(String message, int off, int len) throws IOException {
                    super.write(message, off, len);
                    int eolIndex = message.indexOf(LINE_SEPARATOR);
                    if (eolIndex != -1) {
                        m_buffer += message.substring(0, eolIndex);
                        if (m_buffer.indexOf(ERROR_TYPE_LABEL) != -1) {
                            m_errors += m_buffer + LINE_SEPARATOR;
                        }
                        m_buffer = message.substring(eolIndex + 1);
                    } else {
                        m_buffer += message;
                    }
                }
            });
            m_logger = new PrintWriterTreeLogger(m_writer);
            ((AbstractTreeLogger) m_logger).setMaxDetail(type);
        }
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // ILogSupport
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * @return the {@link TreeLogger} instance.
     */
    public Object getLogger() {
        return m_logger;
    }

    public void setLogLevel(int logLevel) {
        if (m_writer != null) {
            if (logLevel >= 0 && logLevel < TREE_LOGGER_TYPES.length + 1) {
                ((AbstractTreeLogger) m_logger).setMaxDetail(TREE_LOGGER_TYPES[logLevel]);
            }
        }
    }

    public String getErrorMessages() {
        if (StringUtils.isEmpty(m_errors)) {
            return "<none>";
        }
        return m_errors;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Dispose
    //
    ////////////////////////////////////////////////////////////////////////////
    public void dispose() {
        if (m_writer != null) {
            m_writer.close();
        }
    }
}