/*

  * Copyright (c) 2003-2011, Simon Brown

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  *

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in

  *     the documentation and/or other materials provided with the

  *     distribution.

  *

  *   - Neither the name of Pebble nor the names of its contributors may

  *     be used to endorse or promote products derived from this software

  *     without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 package net.sourceforge.pebble.web.tagext;

 import javax.servlet.jsp.JspException;

 import javax.servlet.jsp.JspTagException;

 import javax.servlet.jsp.JspWriter;

 import javax.servlet.jsp.tagext.TagSupport;

 import java.lang.reflect.Method;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.Iterator;

 /**

  * Given a Collection or array, this tag produces a HTML select (dropdown) list

  * based upon the items contained within.

  *

  * @author    Simon Brown

  */

 public class SelectTag extends TagSupport {

   /** the items over which this tag should iterate */

   private Collection items;

   /** the name of the select control */

   private String name;

   /** the size of the select control */

   private int size = -1;

   /** the multiple attribute */

   private boolean multiple = false;

   /** the name of the property to be used as the displayed label */

   private String label;

   /** the name of the property to be used as the hidden value */

   private String value;

   /** the selected value */

   private Object selected;

   /**

    * Called when the starting tag is encountered.

    */

   public int doStartTag() throws JspException {

     // setup the iterator to be used

     Iterator iterator = items.iterator();

     try {

       JspWriter out = pageContext.getOut();

       // write the starting tag of the select control

       out.print("<select name=\"");

       out.print(name);

       out.print("\"");

       if (size > 0) {

         out.print(" size=\"");

         out.print(size);

         out.print("\"");

       }

       if (multiple) {

         out.print(" multiple=\"true\"");

       }

       out.print(">");

       while (iterator.hasNext()) {

         // get the next JavaBean from the items

         Object o = iterator.next();

         // and the property used to represent the hidden value

         String hiddenValue;

         if (value != null) {

           Method m = o.getClass().getMethod("get" + value.substring(0, 1).toUpperCase() + value.substring(1), new Class[] {});

           hiddenValue = m.invoke(o, new Object[]{}).toString();

         } else {

           hiddenValue = o.toString();

         }

         // and now generate the HTML

         out.print("<option value=\"");

         // call the accessor method for the value property

         // (this is the same as calling get<PropertyName>() on

         // the JavaBean instance)

         out.print(hiddenValue);

         out.print("\"");

         if (selected != null) {

           if (selected instanceof Collection) {

             Collection coll = (Collection)selected;

             if (coll.contains(hiddenValue)) {

               out.print(" selected=\"true\"");

             }

           } else if (selected.toString().equals(hiddenValue)) {

             out.print(" selected=\"true\"");

           }

         }

         out.print(">");

         if (label != null) {

           // and do the same for the label property

           // and use it to create a description of the property used

           // to represent the displayable label

           Method m = o.getClass().getMethod("get" + label.substring(0, 1).toUpperCase() + label.substring(1), new Class[] {});

           out.print(

               m.invoke(o, new Object[]{}));

         } else {

           out.print(o.toString());

         }

         out.print("</option>");

       }

       // write the ending tag of the select control

       out.print("</select>");

     } catch (Exception e) {

       e.printStackTrace();

       throw new JspTagException(e.getMessage());

     }

     // and skip the body

     return SKIP_BODY;

   }

   /**

    * Sets the items over which this tag should iterate.

    *

    * @param items   a Collection or array

    */

   public void setItems(Object items) {

     if (items instanceof Collection) {

       this.items = (Collection)items;

     } else if (items instanceof Object[]) {

       this.items = Arrays.asList((Object[])items);

     }

   }

   /**

    * Sets the name for the generated select control.

    *

    * @param name    the name as a String

    */

   public void setName(String name) {

     this.name = name;

   }

   /**

    * Sets the size of the generated select control.

    *

    * @param size    the size

    */

   public void setSize(int size) {

     this.size = size;

   }

   /**

    * Sets the multiple attribute on the underlying select control.

    *

    * @param   multiple    a boolean

    */

   public void setMultiple(boolean multiple) {

     this.multiple = multiple;

   }

   /**

    * Sets the name of the property to display.

    *

    * @param label   the name of the label property

    */

   public void setLabel(String label) {

     this.label = label;

   }

   /**

    * Sets the name of the property to use as the hidden value.

    *

    * @param value   the name of the value property

    */

   public void setValue(String value) {

     this.value = value;

   }

   /**

    * Sets the selected value.

    *

    * @param selected    the selected value

    */

   public void setSelected(Object selected) {

     this.selected = selected;

   }

 }