manifest.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

/*********************************************************************
 * 
 * Use, duplication, or disclosure by the Government is subject to
 * restricted rights as set forth in the DFARS.
 * 
 * BBNT Solutions LLC A Part of Verizon 10 Moulton Street Cambridge,
 * MA 02138 [phone]
 * 
 * Copyright (C) 2002 by BBNT Solutions, LLC All Rights Reserved.
 * **********************************************************************
 */

package com.bbn.openmap.tools.beanbox;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Vector;

/*
 * Stores a list of headers that all pertain to a particular file in
 * the archive
 */
public class Manifest {

    private Vector entries = new Vector();

    static final boolean debug = false;

    static final void debug(String s) {
        if (debug)
            System.out.println("man> " + s);
    }

    public Manifest() {}

    public Manifest(byte[] bytes) throws IOException {
        this(new ByteArrayInputStream(bytes));
    }

    /**
     * Parse a manifest from a stream
     */
    public Manifest(InputStream is) throws IOException {
        while (is.available() != 0) {
            MessageHeader m = new MessageHeader(is);
            entries.addElement(m);
        }
    }

    /* recursively generate manifests from directory tree */
    public Manifest(String[] files) throws IOException {
        MessageHeader globals = new MessageHeader();
        globals.add("Manifest-Version", "1.0");
        addEntry(globals);
        addFiles(null, files);
    }

    public void addEntry(MessageHeader entry) {
        entries.addElement(entry);
    }

    public MessageHeader getEntry(String name) {
        Enumeration enumeration = entries();
        while (enumeration.hasMoreElements()) {
            MessageHeader mh = (MessageHeader) enumeration.nextElement();
            String nameVal = mh.findValue("Name");
            if (nameVal != null && nameVal.equals(name)) {
                return mh;
            }
        }
        return null;
    }

    public MessageHeader entryAt(int i) {
        return (MessageHeader) entries.elementAt(i);
    }

    public Enumeration entries() {
        return entries.elements();
    }

    public void addFiles(File dir, String[] files) throws IOException {
        if (files == null)
            return;
        for (int i = 0; i < files.length; i++) {
            File file;
            if (dir == null) {
                file = new File(files[i]);
            } else {
                file = new File(dir, files[i]);
            }
            if (file.isDirectory()) {
                addFiles(file, file.list());
            } else {
                addFile(file);
            }
        }
    }

    public void addFile(File f) throws IOException {
        MessageHeader mh = new MessageHeader();
        mh.add("Name", f.getPath());
        addEntry(mh);
    }

    /*
     * Add a manifest file at current position in a stream
     */
    public void stream(OutputStream os, Vector extraFiles) throws IOException {

        /*
         * the first header in the file should be the global one. It
         * should say "Manifest-Version: x.x"; barf if not
         */
        MessageHeader globals = (MessageHeader) entries.elementAt(0);
        if (globals.findValue("Manifest-Version") == null) {
            throw new IOException("Manifest file requires "
                    + "Manifest-Version: 1.0 in 1st header");
        }

        PrintWriter ps = new PrintWriter(os);
        globals.print(ps);

        for (int i = 1; i < entries.size(); ++i) {
            MessageHeader mh = (MessageHeader) entries.elementAt(i);

            mh.print(ps);

            /* REMIND: could be adding files twice!!! */
            String name = mh.findValue("name");
            if (extraFiles != null && name != null) {
                extraFiles.addElement(name);
            }
        }
    }

    public static boolean isManifestName(String name) {

        // remove leading /
        if (name.charAt(0) == '/') {
            name = name.substring(1, name.length());
        }
        // case insensitive
        name = name.toUpperCase();

        if (name.equals("META-INF/MANIFEST.MF")) {
            return true;
        }
        return false;
    }

}