compressor.java

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package ranab.jar;

import java.io.*;
import ranab.util.*;

/**
 * This is tha abstract base class of all the file compressors.
 *
 * @author <a href="mailto:[e-mail]">Rana Bhattacharyya</a>
 */
public
abstract class Compressor {

    protected File mCompressedFile;
    protected JarObserverContainer mObserverCont;


    /**
     * constructor
     * @file fl the new compressed file 
     */
    public Compressor(File fl) {
        mCompressedFile = fl;
        mObserverCont = new JarObserverContainer();
    }
    
    /**
     * add observer
     */
    public void addObserver(JarObserver obsr)  {
        mObserverCont.addObserver(obsr);
    }
    
    /**
     * remove observer
     */
    public void removeObserver(JarObserver obsr)  {
        mObserverCont.removeObserver(obsr);
    }
    
    
    /**
     * add a file/directory
     */
    public void addFile(File file,
                        boolean recursion,
                        boolean pathInfo,
                        int level) {
        addFile(file, file.getParentFile(), recursion, pathInfo, true, level);        
    }


    /**
     * actual work horse
     */
    private void addFile(File file,
                         File parent,
                         boolean recursion,
                         boolean pathInfo,
                         boolean firstTime,
                         int level) {                        

        // if not directory - write now 
        if (!file.isDirectory()) {

            // get entry name
            String filePath = file.getAbsolutePath(); 
            String dirPath = parent.getAbsolutePath();
            String entryName = file.getName();
            if (pathInfo && filePath.startsWith(dirPath)) {
                entryName = filePath.substring(dirPath.length());
            }
            setCompressionLevel(level);
            addFile(file, StringUtils.replaceString(entryName, System.getProperty("file.separator"), "/") );
        } 
        else if (firstTime || recursion) {
            File fileList[] = file.listFiles();
            for (int i=0; i<fileList.length; i++) {
                addFile(fileList[i], parent, recursion, pathInfo, false, level);
            }
        }
    }


    /**
     * open a new compressed file
     */
    abstract public void open() throws Exception; 

    /**
     * add a file
     *
     * @param file the file to be added
     * @param name the entry name (usually the filename)
     */
    abstract protected void addFile(File file, String name);


    /**
     * set the compression level
     */
    abstract protected void setCompressionLevel(int level);


    /**
     * close the compressed file
     */
    abstract public void close();

    /**
     * get the compressed filename
     */
    public String toString() {
        return mCompressedFile.getAbsolutePath();
    }

}