jspmyadminvar.java

管理 MySQL 的工具, 相當方便好用

/*
 * jspMyAdminVar.java 0.6 2001/08/25 
 * Copyright (c) 2001 [e-mail] under the GPL (www.gnu.org/copyleft/)
 * 
 * TERMS OF USAGE:
 * This file was written and developed by Zsolt Mali ([e-mail])
 * for educational and demonstration purposes only.  You have all rights to use,
 * modify, and redistribute this file as you like.  The only
 * requirement is that you must retain this notice, without modifications, at
 * the top of your source code.  No warranties or guarantees are expressed or
 * implied. DO NOT use this code in a production environment without
 * understanding the limitations and weaknesses pretaining to or caused by the
 * use of these scripts, directly or indirectly. USE AT YOUR OWN RISK!
 */
package com.jspmyadmin;

import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.http.*;

public class jspMyAdminVar {

/**
 * Class description goes here.
 *
 * @version 	0.9  2001/07/02 23:22:28
 * @author 	Zsolt Mali
 */

Hashtable parameters = new Hashtable();
PageContext page ;

/** 
 * constructor jspMyAdminVar 
 * 
 * @author Zsolt Mali
 * @param page the PageContext object of the current page
 */
public jspMyAdminVar ( PageContext pagesource) {
        this.page=pagesource;
        reLoad();
        
}//end constructor --> jspMyAdminVar

/**
 * ReLoad all the existent parameters from a page
 * 
 * 
 * @author Zsolt Mali
 */
public void reLoad() {
        this.parameters.clear();
        parseParameters( this.page, this.page.SESSION_SCOPE );
        parseParameters( this.page);
        parseParameters( this.page.getRequest() );        
}//end method --> public void reLoad()

/**
 * this is for testing scope only
 * 
 * 
 * @author Zsolt Mali
 */
public void test() {
        Enumeration e=retKeys();
        while ( e.hasMoreElements() ) {
                try {
                        Object key = e.nextElement();
                        this.page.getOut().println((String)key + "=" + get( key ).toString() + "<br>");
                }
                catch (IOException ex) {
                    System.out.println("Unable to write");
                }
        }        
}//end method --> public void test()


/**
 * Return all the keys from the Hashtable
 * 
 * 
 * @author Zsolt Mali
 */
public Enumeration retKeys() {
        return this.parameters.keys();
}//end method --> public Enumeration retKeys()

/**
 * Return all the values from the Hashtable
 * 
 * 
 * @author Zsolt Mali
 */
public Enumeration retValues() {
        return this.parameters.elements();
}//end method --> public Enumeration retValues()

/**
 * Return true if the specified key exist in the parameters
 * else return false
 * 
 * 
 * @author Zsolt Mali
 * @param key the searched key
 */
public boolean existKey( Object key ) {
        return this.parameters.containsKey( key );
}//end method --> public boolean existKey()

/**
 * Return true if the specified value exist in the parameters
 * else return false
 * 
 * 
 * @author Zsolt Mali
 * @param value the searched value
 */
public boolean existValue( Object value ) {
        return this.parameters.contains( value );
}//end method --> public boolean existValue()

/**
 * Return true if the specified key exist in the parameters and his value is not "" or null
 * else return false
 * 
 * 
 * @author Zsolt Mali
 * @param value the searched value
 */
public boolean notEmpty( Object key ) {
    if ( (this.parameters.containsKey( key )) && (get(key)!=null)  && (!((Object)get(key)).toString().equals(""))) {
        return true;
    }
    return false;
}//end method --> public boolean existValue()

/**
 * If exist the specified key in the list returns his value, else returns null
 * 
 * 
 * @author Zsolt Mali
 * @param key the searched key
 */
public Object get( Object key ) {
    if ( this.parameters.containsKey( key ) != false ) {
        return this.parameters.get( key );
    }
    else {
        return null;
    }
}//end method --> public Object get()

/**
 * If exist the specified key in the list returns his String value, else returns null
 * 
 * 
 * @author Zsolt Mali
 * @param key the searched key
 */
public String get( String key ) {
    if ( this.parameters.containsKey( key ) != false ) {
        return (String)this.parameters.get( key );
    }
    else {
        return null;
    }
}//end method --> public Object get()

/**
 * If exist the specified key in the list returns his int value, else returns null
 * 
 * 
 * @author Zsolt Mali
 * @param key the searched key
 */
public int getInt( String key ) throws NumberFormatException {
    if ( this.parameters.containsKey( key ) != false ) {
        return Integer.parseInt((String)this.parameters.get( key ));
    }
    else {
        return 0;
    }
}//end method --> public Object get()

/**
 * Append a new key --> value pair to hashtable
 * 
 * 
 * @author Zsolt Mali
 * @param key the key
 * @param value the value of the key
 */
public void set( Object key, Object value ) {
        this.parameters.put( key, value);
}//end method --> public void set( Object key, Object value)

/**
 * Append a new key --> value pair to hashtable and to request object
 * 
 * 
 * @author Zsolt Mali
 * @param key the key
 * @param value the value of the key
 */
public void setRequestAttribute( String key, Object value ) {
        this.parameters.put( key, value);
        this.page.getRequest().setAttribute(key , value);
}//end method --> public void setRequestAttribute( Object key, Object value)

/**
 * Parse the request object of the PageContext and makes/adds keys and 
 * value pairs to a Hashtable
 * 
 * @author Zsolt Mali
 * @param request the request object
 */
public void parseParameters(ServletRequest request) {

Enumeration en = request.getAttributeNames();
while ( en.hasMoreElements() ) {
        String name = (String)en.nextElement();
        Object value = request.getAttribute(name);
        if ( value != null ) {
              parameters.put(name,value);

        }

}
Enumeration enum = request.getParameterNames();
while ( enum.hasMoreElements() ) {
        String name = (String)enum.nextElement();
        String value = request.getParameter(name);
        if ( !value.equals("") ) {
                parameters.put(name,value);
        }
}


}//end method --> public void parseParameters(ServletRequest request)

/**
 * Parse the session object of a PageContext and makes/adds keys and 
 * to a Hashtable
 * 
 * @author Zsolt Mali
 * @param session the session object 
 */
public void parseParameters( HttpSession session ) {

String[] enum = session.getValueNames();
for  (int i=0 ; i<enum.length ; i++ ) {
        String name = enum[i];
        Object value = session.getValue(name);
        if ( value != null ) {
               parameters.put(name,value);
        }
        
}

}//end method --> public void parseParameters( HttpSession session )

/**
 * Parse the PageContext and makes/adds attributenames and values 
 * to a Hashtable
 * 
 * @author Zsolt Mali
 * @param page the PageContext object 
 */
public void parseParameters( PageContext page ) {

Enumeration enum = page.getAttributeNamesInScope(page.PAGE_SCOPE);
while ( enum.hasMoreElements() ) {
        String name = (String)enum.nextElement();
        Object value = page.getAttribute(name);
        if ( value != null ) {
               parameters.put(name,value);
        }
        
}

}//end method --> public void parseParameters( page session )

/**
 * Parse the PageContext and makes/adds attributenames and values 
 * to a Hashtable
 * 
 * @author Zsolt Mali
 * @param page the PageContext object 
 */
public void parseParameters( PageContext page, int scope ) {

Enumeration enum = page.getAttributeNamesInScope(scope);
while ( enum.hasMoreElements() ) {
        String name = (String)enum.nextElement();
        Object value = page.getAttribute(name , scope);
        if ( value != null ) {
                parameters.put(name,value);
        }
        
}

}//end method --> public void parseParameters( page session )


}//end class jspMyAdminVar