midletinfo.java

有关j2me的很好的例子可以研究一下

/*
 * @(#)MIDletInfo.java	1.3 01/08/08
 * Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */

package com.sun.midp.midlet;

/**
 * Simple attribute storage for MIDlets in the descriptor/manifest.
 */
public class MIDletInfo {
    /** The name of the MIDlet. */
    public String name;
    /** The icon of the MIDlet. */
    public String icon;
    /** The main class for the MIDlet. */
    public String classname;

    /**
    * Parses out the name, icon and classname. 
    * @param attr contains the name, icon and classname line to be 
    * parsed
    */
    public MIDletInfo(String attr) {
        String[] args;
        int start;
        int offset = 0;

        if (attr == null) {
            return;
        }

        args = new String[3];
        for (int i = 0; i < 3 && offset < attr.length(); i++) {
            if (attr.charAt(offset) == ',') {
                offset++;
            }

            start = offset;
            offset = skipToToken(attr, start);

            if ((offset - start) > 0) {
                // don't forget to trim the leading and trailing spaces
                args[i] = attr.substring(start, offset).trim();
            }

        }
	    
        this.name = args[0];
        this.icon = args[1];
        this.classname = args[2];
    }
    /**
    * Container class to hold information about the current MIDlet.
    * @param name the name of the MIDlet from descriptor file or
    * manifest
    * @param icon the icon to display when the user selects the MIDlet 
    * from a list
    * @param classname the main class for this MIDlet
    */
    public MIDletInfo(String name, String icon, String classname) {
        this.name = name;
        this.icon = icon;
        this.classname = classname;
    }

    /**
     * Skip over characters other ',', stop at end of string
     * @param s the string to parse
     * @param offset initial offset in the string to begine the token search.
     * @return the position of the next token
     */
    private int skipToToken(String s, int offset) {
        int pos;

        pos = s.indexOf(',', offset);
        if (pos >= 0) {
            return pos;
        }

        return s.length();
    }
}