/* 
 * Copyright 2005 Paul Hinds
 *
 * Licensed 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.tp23.antinstaller.runtime;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;

import org.tp23.antinstaller.Installer;

/**
 * A Logger class that does not report errors
 * 
 * @author Paul Hinds
 * @version $Id: SimpleLogger.java,v 1.4 2007/01/19 00:24:36 teknopaul Exp $
 */
public class SimpleLogger implements Logger {

    BufferedWriter fos;

    private String fileName;

    public SimpleLogger() {
    }

    /**
     * This method initialises the logger
     */
    public void setFileName(String fileName) {
        this.fileName = fileName;
        try {
            fos = new BufferedWriter(new FileWriter(fileName, false));
            fos.write("Logger initialized");
            fos.newLine();
        } catch (IOException e) {
            fos = null;
        }
    }

    public String getFileName() {
        return fileName;
    }

    public void log(String message) {
        if (fos == null) {
            return;
        }
        try {
            fos.write(message);
            fos.newLine();
            fos.flush();
        } catch (Exception ex) {
            throw new RuntimeException("Can not write to logs");
        }
    }

    public void log(Installer installer, Throwable exception) {
        if (installer != null && installer.isVerbose()) {
            log(exception);
        }
    }

    public void log(Throwable exception) {
        if (fos == null) {
            return;
        }
        try {
            StringWriter writer = new StringWriter();
            exception.printStackTrace(new PrintWriter(writer));
            String s = writer.getBuffer().toString();
            fos.write(s);
            fos.newLine();
        } catch (IOException ex) {
            throw new RuntimeException("Can not write to logs");
        }
    }

    public void close() {
        try {
            if (fos != null) {
                fos.flush();
                fos.close();
                fos = null;
            }
        } catch (IOException e) {
            System.err.println("Can't close logger");
        }
    }

    /**
     * Called by the garbage collector on an object when garbage collection
     * determines that there are no more references to the object.
     * 
     * @throws Throwable
     *             the <code>Exception</code> raised by this method
     * @todo Implement this java.lang.Object method
     */
    protected void finalize() throws Throwable {
        if (fos != null) {
            fos.flush();
            fos.close();
        }
    }

}