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package com.sun.jdo.api.persistence.enhancer.util;

import java.util.Hashtable;
import java.util.Enumeration;
import java.util.zip.ZipFile;
import java.io.*;

/**
 * ZipFileRegistry provides a central point for lookup of zip files
 * within the filter tool.  It needs to be public because it's
 * accessed from outside the filter.util package.
 */

public
class ZipFileRegistry {
  /* A mapping of file name to ZipFile */
  private static Hashtable zipFileMap = new Hashtable(11); 

  /**
   * Return a zip file which may already be open
   */
  public static ZipFile openZipFile(File f)
    throws FileNotFoundException, IOException {
    ZipFile zf = (ZipFile) zipFileMap.get(f.getPath());
    if (zf == null) {
      zf = new ZipFile(f);
      zipFileMap.put(zf.getName(), zf);
    }
    return zf;
  }

  /**
   * Return a zip file which must already be open
   */
  public static ZipFile getZipFile(String path) {
    return (ZipFile) zipFileMap.get(path);
  }

  /**
   * Returns an enumeration of the zip files in the registry
   * Each element is a ZipFile.
   */
  public static Enumeration zipFiles() {
    return zipFileMap.elements();
  }
  
}