Jetty example source code file (Select.java)

This example Jetty source code file (Select.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

block, composite, composite, enumeration, enumeration, select, select, string, string, util

The Jetty Select.java source code

// ========================================================================
// $Id: Select.java,v 1.7 2005/08/13 00:01:23 gregwilkins Exp $
// Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.mortbay.html;
import java.util.Enumeration;



/* -------------------------------------------------------------------- */
/** HTML select Block.
 * @see  org.mortbay.html.Block
 */
public class Select extends Block
{
    /* ----------------------------------------------------------------- */
    /**
     * @param name Name of the form element
     * @param multiple Whether multiple selections can be made
     */
    public Select(String name,boolean multiple)
    {
        super("select");
        attribute("name",name);
        
        if (multiple)
            attribute("multiple");
    }

    /* ----------------------------------------------------------------- */
    /**
     * @param name Name of the form element
     * @param multiple Whether multiple selections can be made
     */
    public Select(String name,boolean multiple, String[] options)
    {
        this(name,multiple);
        
        for (int i=0; i<options.length; i++)
            add(options[i]);
    }

    /* ----------------------------------------------------------------- */
    /** Set the number of options to display at once */
    public Select setSize(int size)
    {
        size(size);
        return this;
    }

    /* ----------------------------------------------------------------- */
    public Select add(Enumeration e)
    {
        while (e.hasMoreElements())
            add(e.nextElement().toString());
        return this;
    }

    /* ----------------------------------------------------------------- */
    /** Add option and specify if selected.
     */
    public Composite add(Object o)
    {
        if (o instanceof Enumeration)
            this.add((Enumeration)o);
        else
        {
            super.add("<option>");
            super.add(o);
        }
        return this;
    }

    /* ----------------------------------------------------------------- */
    /** Add option and specify if selected.
     */
    public Select add(Object o, boolean selected)
    {
        if (selected)
            super.add("<option selected>");
        else
            super.add("<option>");
        super.add(o);
        return this;
    }

    /* ----------------------------------------------------------------- */
    /** Add an option.
     * @param o The name of the option (displayed in the form)
     * @param selected Whether the option is selected
     * @param value The value of this option (returned in the form content)
     */
    public Select add(Object o, boolean selected, String value)
    {
        if (selected)
            super.add("<option selected value=\""+value+"\">");
        else
            super.add("<option value=\""+value+"\">");
        
        super.add(o);
        
        return this;
    }
    
    /* ----------------------------------------------------------------- */
    /** Build a select from the given array of Strings. The values of the
      * select are the indexes into the array of the strings, which are used
      * as the labels on the selector.
      * @param arr The array of strings for labels
      * @param selected The index of the selected label, -1 for default
      */
    public Select add(String arr[], int selected)
    {
        for (int i = 0; i < arr.length; i++){
            this.add(arr[i], i == selected, Integer.toString(i));
        }
        return this;
    }
    
    /* ----------------------------------------------------------------- */
    /** Build a select from the given array of Strings. The values of the
      * select are the indexes into the array of the strings, which are used
      * as the labels on the selector.
      * @param arr The array of strings for labels
      * @param selected The index of the selected label, -1 for default
      */
    public Select add(String arr[], String selected)
    {
        for (int i = 0; i < arr.length; i++){
            this.add(arr[i], arr[i].equals(selected));
        }
        return this;
    }

    /* ----------------------------------------------------------------- */
    /** Utility function for multi-selectors.
     * <p> This function takes the result returned by a multi-select input
     * and produces an integer bit-set result of the selections made. It
     * assumes the values of the multi-select are all different powers of 2.
     */
    public static int bitsetFormResult(String result)
    {
        int i;
        int from = 0;
        int res = 0;
        String sres = null;
        while ((i = result.indexOf(' ', from)) != -1){
            sres = result.substring(from, i);
            res = res | Integer.parseInt(sres);
            from = i+1;
        }
        sres = result.substring(from);
        res = res | Integer.parseInt(sres);
        return res;     
    }
}