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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2007-2018 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * $Id: ListRendererBase.java,v 1.1.4.1.2.1 2009-12-29 04:52:45 jyeary Exp $
 */
package com.sun.webui.jsf.renderkit.html;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.component.EditableValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
import com.sun.webui.jsf.component.ListManager;
import com.sun.webui.jsf.component.ListSelector;
import com.sun.webui.jsf.model.Separator;
import com.sun.webui.jsf.model.OptionTitle;
import com.sun.webui.jsf.model.list.ListItem;
import com.sun.webui.jsf.model.list.StartGroup;
import com.sun.webui.jsf.model.list.EndGroup;
import com.sun.webui.jsf.util.ConversionUtilities;
import com.sun.webui.jsf.util.RenderingUtilities;

/**
 * The ListRendererBase is the base class for the listbox renderers
 * (Drop-down Menu and Selectable List). These are both rendered using
 * the same HTML tag (select) so a lot of the renderering functionality
 * is shared.
 */
public abstract class ListRendererBase extends Renderer {

    /**
     *
     */
    private final static boolean DEBUG = false;
    /** 
The list of attribute names in the HTML 4.01 Specification that
     * correspond to the entity type %events;.
     */
    public static final String[] STRING_ATTRIBUTES = {"onBlur", "onClick", "onDblClick", "onFocus", //NOI18N
        "onMouseDown", "onMouseUp", "onMouseOver", //NOI18N
        "onMouseMove", "onMouseOut", "onKeyPress", //NOI18N
        "onKeyDown", "onKeyUp", "onSelect" //NOI18N
    };
    protected static final String SEPARATOR = "|";  //NOI18N

    /**
     * 
This method determines whether the component should be
     * rendered as a standalone list, or laid out together with a
     * label that was defined as part of the component.
     *
     * 
A label will be rendered if either of the following is
     * true:
     * 

     * 
The page author defined a label facet; or
     * 
The page author specified text in the label attribute.
     * 
     * 
If there is a label, the component will be laid out using a
     * HTML table. If not, the component will be rendered as a
     * standalone HTML select element.
     * @param component The component associated with the
     * renderer. Must be a subclass of ListSelector.
     * @param context The FacesContext of the request
     * @param styles A String array of styles used to render the
     * component. The first item of the array is the name of the
     * JavaScript method that handles change event. The second item is
     * the style used when the list is enabled. The third style is the
     * one to use when the list is disabled. The fourth item is the
     * style to use for an item that is enabled, the fifth to use for
     * an item that is disabled, and the sixth to use when the item is
     * selected.
     * @throws java.io.IOException if the renderer fails to write to
     * the response
     */
    void renderListComponent(ListSelector component, FacesContext context,
            String[] styles)
            throws IOException {

        if (DEBUG) {
            log("renderListComponent()");
        }

        boolean readonly = component.isReadOnly();
        if (readonly) {
            if (DEBUG) {
                log("\t component is readonly");
            }
            // We don't want to accidentally mark any label as
            // required in this case...
            component.setRequired(false);
        }

        UIComponent label = component.getLabelComponent();
        ResponseWriter writer = context.getResponseWriter();
        String id = component.getClientId(context);
        boolean spanRendered = false;

        if (label != null) {
            renderOpenEncloser(component, context, "span", styles[8]); //NOI18N
            spanRendered = true;
            writer.writeText("\n", null);
            if (!component.isLabelOnTop() && component.getRows() > 1) {
                Map attributes = label.getAttributes();
                Object styleClass = attributes.get("styleClass");
                if (styleClass == null) {
                    attributes.put("styleClass", styles[9]);
                } else if (styleClass.toString().indexOf(styles[9]) == -1) {
                    attributes.put("styleClass", styleClass + " " + styles[9]);
                }
            }

            RenderingUtilities.renderComponent(label, context);
            writer.writeText("\n", null);
            if (component.isLabelOnTop()) {

                writer.startElement("br", component); //NOI18N
                writer.endElement("br");         //NOI18N
                writer.writeText("\n", null);
            }

            writer.writeText("\n", null);
            id = id.concat(ListSelector.LIST_ID);
        }

        if (readonly) {
            UIComponent value = component.getReadOnlyValueComponent();
            if (label == null) {
                value.getAttributes().put("style", component.getStyle());
                value.getAttributes().put("styleClass", component.getStyleClass());
            }
            RenderingUtilities.renderComponent(value, context);
        } else {
            //renderHiddenValue(component, context, writer, styles[8]);
            //writer.writeText("\n", null);

            // Because renderHiddenValue is commented out this needs
            // to be called for supporting DB NULL values.
            // If it becomes uncommented remove this call.
            //
            recordRenderedValue(component);
            renderList(component, id, context, styles, label == null);
        }
        if (label != null) {
            context.getResponseWriter().endElement("span"); //NOI18N
        }
    }

    /**
     * Overrides encodeChildren of Renderer to do nothing. This
     * renderer renders its own children, but not through this
     * method.
     * @param context The FacesContext of the request
     * @param component The component associated with the
     * renderer. Must be a subclass of ListSelector.
     */
    @Override
    public void encodeChildren(javax.faces.context.FacesContext context,
            javax.faces.component.UIComponent component)
            throws java.io.IOException {
        return;
    }

    /**
     * 
Renders the opening div tag.
     * @param component The component associated with the
     * renderer. Must implement ListManager
     * @param context The FacesContext of the request
     * @param element One of "span" or "div"
     * @throws java.io.IOException if the renderer fails to write to
     * the response
     */
    protected void renderOpenEncloser(ListManager component,
            FacesContext context,
            String element,
            String hiddenStyle)
            throws IOException {

        String id = component.getClientId(context);

        ResponseWriter writer = context.getResponseWriter();
        writer.writeText("\n", null);
        writer.startElement(element, (UIComponent) component);
        writer.writeAttribute("id", id, "id"); //NOI18N

        String style = component.getStyle();
        if (style != null && style.length() > 0) {
            writer.writeAttribute("style", style, "style");      //NOI18N
        }
        style = component.getStyleClass();
        if (component.isVisible()) {
            if (style != null && style.length() > 0) {
                writer.writeAttribute("class", style, "class"); //NOI18N
            }
        } else {
            if (style == null) {
                style = hiddenStyle;
            } else {
                style = style + " " + hiddenStyle; //NOI18N
            }
            writer.writeAttribute("class", style, "class"); //NOI18N
        }

        writer.writeText("\n", null);                         //NOI18N
    }

    protected void renderHiddenValue(UIComponent component, FacesContext context,
            ResponseWriter writer, String hiddenStyle)
            throws IOException {

        ListManager listManager = (ListManager) component;

        recordRenderedValue(component);

        String hiddenID = component.getClientId(context).concat(ListSelector.VALUE_ID);
        String hiddenLabelID = component.getClientId(context).concat(ListSelector.VALUE_LABEL_ID);

        String[] values = listManager.getValueAsStringArray(context);
        if (DEBUG) {
            log("Values are: ");
            for (int i = 0; i < values.length; ++i) {
                log(String.valueOf(values[i]));
            }
        }

        // Write a hidden label to pacify a11y checkers.
        writer.startElement("label", component); //NOI18N
        writer.writeAttribute("id", hiddenLabelID, null); //NOI18N
        writer.writeAttribute("for", hiddenID, "for"); //NOI19N
        writer.writeAttribute("class", hiddenStyle, null); //NOI18N     
        writer.endElement("label"); //NOI18N
        // Write the hidden  

        writer.startElement("select", component); //NOI18N
        writer.writeAttribute("id", hiddenID, null); //NOI18N
        writer.writeAttribute("name", hiddenID, null); //NOI18N
        writer.writeAttribute("multiple", "true", null); //NOI18N
        writer.writeAttribute("class", hiddenStyle, null); //NOI18N
        writer.writeText("\n", null); //NOI18N
        for (int counter = 0; counter < values.length; ++counter) {
            writer.startElement("option", component); //NOI18N
            writer.writeAttribute("selected", "selected", null); //NOI18N
            writer.writeAttribute("value", values[counter], null); //NOI18N
            writer.writeText(values[counter], null); //NOI18N
            writer.endElement("option"); //NOI18N
            writer.writeText("\n", null); //NOI18N          
        }
        writer.endElement("select"); //NOI18N       
    }

    /**
     * This is the base method for rendering a HTML select
     * element. This method is based on the functionality of the RI
     * version, so it invokes a method renderSelectItems which in term
     * invokes renderSelectItem. Currently, this renderer requires for
     * the options to be specified using the JSF SelectItem construct,
     * but this should be replaced with a Lockhart version, because
     * the JSF version lacks the ability to associate an id with the
     * list item. I'm not sure whether it should be possible to use
     * SelectItem as well yet.
     * @param component The UI Component associated with the
     * renderer.
     * @param context The FacesContext of the request
     * @param styles A String array of styles used to render the
     * component. The first item of the array is the name of the
     * JavaScript method that handles change event. The second item is
     * the style used when the list is enabled. The third style is the
     * one to use when the list is disabled. The fourth item is the
     * style to use for an item that is enabled, the fifth to use for
     * an item that is disabled, and the sixth to use when the item is
     * selected.
     * @throws java.io.IOException if the renderer fails to write to
     * the response
     */
    protected void renderList(ListManager component, String id,
            FacesContext context, String[] styles)
            throws IOException {
        renderList(component, id, context, styles, false);
    }

    private void renderList(ListManager listManager, String id,
            FacesContext context, String[] styles,
            boolean renderUserStyles)
            throws IOException {

        // Set the style class
        String styleClass = styles[1];
        if (listManager.isDisabled()) {
            styleClass = styles[2];
        }

        ResponseWriter writer = context.getResponseWriter();

        writer.startElement("select", (UIComponent) listManager);              //NOI18N

        if (renderUserStyles) {
            String style = listManager.getStyle();
            if (style != null && style.length() > 0) {
                writer.writeAttribute("style", style, null); //NOI18N
            }
            String compStyleClass = getStyleClass(listManager,
                    styles[8]);

            if (compStyleClass != null && compStyleClass.length() > 0) {
                styleClass = compStyleClass + " " + styleClass;
            }
        }

        writer.writeAttribute("class", styleClass, null);      //NOI18N
        writer.writeAttribute("id", id, null); //NOI18N
        if (listManager.mainListSubmits()) {
            writer.writeAttribute("name", id, null);           //NOI18N
        }
        int size = listManager.getRows();
        if (size < 1) {
            size = 12;
        }
        writer.writeAttribute("size", String.valueOf(size), null); //NOI18N

        if (listManager.isMultiple()) {
            writer.writeAttribute("multiple", "multiple", null); //NOI18N
        }

        if (listManager.isDisabled()) {
            writer.writeAttribute("disabled", //NOI18N
                    "disabled", //NOI18N
                    "disabled"); //NOI18N
        }

        String tooltip = listManager.getToolTip();
        if (tooltip != null) {
            writer.writeAttribute("title", tooltip, null); //NOI18N
        }

        if (DEBUG) {
            log("Setting onchange event handler");
        }
        writer.writeAttribute("onchange", styles[0], null);    //NOI18N

        int tabindex = listManager.getTabIndex();
        if (tabindex > 0 && tabindex < 32767) {
            writer.writeAttribute("tabindex", //NOI18N
                    String.valueOf(tabindex),
                    "tabindex");              //NOI18N
        }

        RenderingUtilities.writeStringAttributes((UIComponent) listManager,
                writer, STRING_ATTRIBUTES);

        writer.writeText("\n", null); //NOI18N

        renderListOptions((UIComponent) listManager,
                listManager.getListItems(context, true),
                writer, styles);

        writer.endElement("select");  //NOI18N
        writer.writeText("\n", null); //NOI18N
    }

    /**
     * Append the webui component's own JavaScript function at the end
     * of any component-specific event handling code.
     * @param component The ListManager for which we create the function call
     * @param functionName The name of the function
     * @param context The FacesContext of this request
     */
    protected String getOnChangeJavaScript(ListManager component,
            String functionName,
            FacesContext context) {

        String script = component.getOnChange();
        String id = component.getClientId(context);
        StringBuffer onchangeBuffer = new StringBuffer(200);
        if (script != null) {
            onchangeBuffer.append(script).append(";");
        }
        onchangeBuffer.append(functionName);
        onchangeBuffer.append("(\'"); //NOI18N
        onchangeBuffer.append(id);
        onchangeBuffer.append("\'); "); //NOI18N
        onchangeBuffer.append(" return false;"); //NOI18N
        return onchangeBuffer.toString();
    }

    /**
     * This is the method responsible for rendering the options of a
     * HTML select element. This method is based on the corresponding
     * method from the JSF RI, so the options to be specified using
     * the JSF SelectItem construct. This will have to be replaced -
     * see the renderList method for details.
     * 
Note - option groups are not yet implemented w.r.t. any
     * styles  specified by the HCI guidelines.
     * @param component The UI Component associated with the renderer
     * @param styles A String array of styles used to render the
     * component. The first item of the array is the name of the
     * JavaScript method that handles change event. The second item is
     * the style used when the list is enabled. The third style is the
     * one to use when the list is disabled. The fourth item is the
     * style to use for an item that is enabled, the fifth to use for
     * an item that is disabled, and the sixth to use when the item is
     * selected.
     * @throws java.io.IOException if the renderer fails to write to
     * the response
     */
    void renderListOptions(UIComponent component,
            Iterator optionsIterator,
            ResponseWriter writer,
            String[] styles)
            throws IOException {

        if (DEBUG) {
            log("renderListOptions() START");
        }

        Object option = null;
        boolean noSeparator = true;

        while (optionsIterator.hasNext()) {

            option = optionsIterator.next();

            if (option instanceof Separator) {
                if (DEBUG) {
                    log("\tFound separator"); //NOII18N
                }
                renderSeparator(component, writer, styles[7]);
            } else if (option instanceof StartGroup) {

                if (DEBUG) {
                    log("\tFound option group"); //NOII18N
                }
                StartGroup group = (StartGroup) option;
                if (DEBUG) {
                    log("\tThis is the start of a group"); //NOI18N
                    log("\tLabel is" + group.getLabel());  //NOI18N
                }

                if (!noSeparator) {
                    renderSeparator(component, writer, styles[7]);
                }
                writer.startElement("optgroup", component);     //NOI18N
                writer.writeAttribute("label", //NOI18N
                        group.getLabel(),
                        null);
                writer.writeAttribute("class", //NOI18N
                        styles[6],
                        null);
                writer.write("\n");                        //NOI18N
                noSeparator = true;
            } else if (option instanceof EndGroup) {
                if (DEBUG) {
                    log("\tThis is the end of a group");
                }
                writer.endElement("optgroup");         //NOI18N
                writer.write("\n");                    //NOI18N
                if (optionsIterator.hasNext()) {
                    renderSeparator(component, writer, styles[7]);
                }
                noSeparator = true;
            } else {
                renderListOption(component, (ListItem) option, writer, styles);
                noSeparator = false;
            }
        }
        if (DEBUG) {
            log("renderListOptions() END");
        }
    }

    /**
     *
     * This is the method responsible for rendering an individual
     * option for a HTML select element.
     *
     * @param option The ListItem to render
     * @param writer The ResponseWriter used to render the option
     * @param styles A String array of styles used to render the
     * component. The first item of the array is the name of the
     * JavaScript method that handles change event. The second item is
     * the style used when the list is enabled. The third style is the
     * one to use when the list is disabled. The fourth item is the
     * style to use for an item that is enabled, the fifth to use for
     * an item that is disabled, and the sixth to use when the item is
     * selected.
     * @throws java.io.IOException if the renderer fails to write to
     * the response
     */
    void renderListOption(UIComponent list,
            ListItem listItem,
            ResponseWriter writer,
            String[] styles)
            throws IOException {

        if (DEBUG) {
            log("renderListOption() - START");
        }

        // By default, we use the basic option style
        String styleClass = styles[3];

        // CR 6317842. Regardless if the option is currently selected or        
        // not, the disabled option style should be used when the option
        // is disabled. So, check for the disabled item first.        
        if (listItem.isDisabled()) {
            if (DEBUG) {
                log("\tItem is disabled");
            }
            // Use "disabled" option style
            styleClass = styles[4];
        } else if (listItem.isSelected()) {
            if (DEBUG) {
                log("\tItem is selected");
            }
            // Use "selected" option style
            styleClass = styles[5];
            if (DEBUG) {
                log("\tStyleclass is " + styleClass);
            }
        } else if (DEBUG) {
            if (DEBUG) {
                log("\tNormal item");
            }
        }

        writer.writeText("\t", null);                            //NOI18N
        writer.startElement("option", list);                     //NOI18N
        writer.writeAttribute("class", styleClass, null);        //NOI18N
        String itemValue = listItem.getValue();

        // Note that there is no distinction made between an
        // itemValue that is null or an empty string.
        // This is important since the results may be indistinguishable
        // on the client and therefore indistinguishable in the response.
        // 
        // However Option which inherits from SelectItem does not
        // allow null item values.
        //
        if (itemValue != null) {
            if (DEBUG) {
                log("Item value is not null");
            }
            writer.writeAttribute("value", itemValue, null);      //NOI18N
        }
        if (listItem.isDisabled()) {
            writer.writeAttribute("disabled", "disabled", null); //NOI18N
        }
        if (listItem.isSelected()) {
            if (DEBUG) {
                log("\tWriting selected attribute");
            }
            writer.writeAttribute("selected", "selected", null); //NOI18N
        }

        boolean title = listItem.isTitle();
        if (title) {
            writer.write("— ");
        }
        writer.write(listItem.getLabel());
        if (title) {
            writer.write(" —");
        }
        writer.endElement("option");                             //NOI18N
        writer.writeText("\n", null);                            //NOI18N
        if (DEBUG) {
            log("\trenderListOption() - END");
        }
        return;
    }

    /**
     *
     * This method is responsible for rendering a separator for an
     * option group.
     *
     * @param option The component for which we render the separator
     * @param writer The ResponseWriter used to render the separator
     * @param style The style to use when rendering the option.
     * @throws java.io.IOException if the renderer fails to write to
     * the response
     */
    void renderSeparator(UIComponent component, ResponseWriter writer,
            String style) throws IOException {

        if (!(component instanceof ListSelector)) {
            return;
        }

        ListSelector selector = (ListSelector) component;
        if (!selector.isSeparators()) {
            return;
        }

        writer.writeText("\t", null);                        //NOI18N
        writer.startElement("option", component);                 //NOI18N
        writer.writeAttribute("class", style, null);         //NOI18N
        writer.writeAttribute("disabled", "disabled", null); //NOI18N

        int numEms = selector.getSeparatorLength();
        StringBuffer labelBuffer = new StringBuffer();
        for (int em = 0; em < numEms; ++em) {
            labelBuffer.append("-");                         //NOI18N
        }

        writer.writeText(labelBuffer.toString(), null);
        writer.endElement("option");                         //NOI18N
        writer.writeText("\n", null);                        //NOI18N
    }

    /** This method is used by some of the renderers that extend
    ListRenderBase (not ListBox and DropDown). I should
    probably refactor things so that we always know what
    the hidden style is instead - then renderListComponent
    would do.
    TODO.
     */
    void renderReadOnlyList(ListManager component, UIComponent label,
            FacesContext context, String hiddenStyle)
            throws IOException {

        UIComponent value = component.getReadOnlyValueComponent();

        renderOpenEncloser(component, context, "span", hiddenStyle);
        if (label != null) {
            RenderingUtilities.renderComponent(label, context);
        }
        RenderingUtilities.renderComponent(value, context);
        context.getResponseWriter().endElement("span"); //NOI18N
    }

    // Prepend the hidden style to the user's added style if necessary
    private String getStyleClass(ListManager component, String hiddenStyle) {

        String style = component.getStyleClass();
        if (style != null && style.length() == 0) {
            style = null;
        }

        if (!component.isVisible()) {
            if (style == null) {
                style = hiddenStyle;
            } else {
                style = style + " " + hiddenStyle;
            }
        }
        return style;
    }

    /**
     * Retrieve user input from the UI.
     * @param context The FacesContext of this request
     * @param component The component associated with the renderer
     */
    @Override
    public void decode(FacesContext context, UIComponent component) {

        if (DEBUG) {
            log("decode()");
        }
        String id = component.getClientId(context);

        // We used to depend on getLabelComponent() returning non-null
        // to calculate the ID to be used to retrieve parameters for the 
        // component. But after the changes made to the facet management, 
        // that mechanism doesn't work anymore. 
        // We can simply see if we have any input for any of the 
        // possible parameter names instead, similar to what field 
        // does. It works, though we can technically end up looking 
        // at the wrong parameter, if there was no input. 
        Map params = context.getExternalContext().getRequestParameterMap();
        Object valueObject = params.get(id);

        if (valueObject == null) {
            id = id.concat(ListSelector.LIST_ID);
        }
        decode(context, component, id);
    }

    /**
     * Retrieve user input from the UI.
     * The expected format of the request parameter of interest is
     * valuevalue ...
     * If a value is an empty string the format is
     * 
     * If there is no value there is a single separator.
     * @param context The FacesContext of this request
     * @param component The component associated with the renderer
     * @param id The DOM id of the select element which represents the 
     * value of the list
     */
    protected void decode(FacesContext context, UIComponent component,
            String id) {

        if (DEBUG) {
            log("decode(context, component, id)");
        }
        if (DEBUG) {
            log("id is " + id);
        }
        ListManager lmComponent = (ListManager) component;

        if (lmComponent.isReadOnly()) {
            if (DEBUG) {
                log("component is readonly...");
            }
            return;
        }

        Map params = context.getExternalContext().getRequestParameterValuesMap();

        String[] values = null;
        Object p = params.get(id);
        if (p == null) {
            values = new String[0];
        } else {
            if (DEBUG) {
                log("\tValue is string array");
            }
            values = (String[]) p;
        }

        // If we find the OptionTitle.NONESELECTED
        // value among a multiple selection list, remove it.
        // If there is only one value and it matches
        // OptionTitle.NONESELECTED then act like the
        // submit did not happen at all and leave the submitted
        // value as is. It should be null, thereby effectively
        // taking this component out of further lifecycle processing.
        //
        if (values.length > 1) {
            // Need to remove any OptionTitle submitted values
            //
            ArrayList newParams = new ArrayList();
            for (int i = 0; i < values.length; ++i) {
                if (OptionTitle.NONESELECTED.equals(values[i])) {
                    continue;
                }
                newParams.add(values[i]);
            }
            values = (String[]) newParams.toArray(new String[newParams.size()]);
        } else if (values.length == 1 &&
                OptionTitle.NONESELECTED.equals(values[0])) {
            return;
        }


        if (DEBUG) {
            log("\tNumber of Selected values " + //NOI18N
                    String.valueOf(values.length));
            for (int counter = 0; counter < values.length; ++counter) {
                log("\tvalue: " + values[counter]); //NOI18N
            }
        }

        //CR 6455533/6447372
        //if component is disabled, don't set empty array as submitted value
        //so only set if values.length > 0, or if it's == 0 and the component
        //is not disabled
        if (values.length > 0 || !lmComponent.isDisabled()) {
            lmComponent.setSubmittedValue(values);
        }

    }

    /**
     * The list is not responsible for rendering any child components,
     * so this method returns false. (This is unintuitive, but it
     * causes the right behaviour). I need to understand this better.
     */
    @Override
    public boolean getRendersChildren() {
        return true;
    }

    /**
     * Retrieves the selected values as Strings.
     * @param context The FacesContext of this request
     * @param component The component associated with the renderer
     */
    String[] getUserInput(FacesContext context,
            UIComponent component) {

        if (DEBUG) {
            log("::getUserSelectedValues()");
        }
        String id = component.getClientId(context);
        // Util.doAssert(id != null);
        Map params =
                context.getExternalContext().getRequestParameterValuesMap();

        String[] values = null;
        if (params.containsKey(id)) {
            values = (String[]) params.get(id);
        }
        if (values == null) {
            values = new String[0];
        }
        if (DEBUG) {
            log("\tNumber of Selected values " + // NOI18N
                    String.valueOf(values.length));
            for (int counter = 0; counter < values.length; ++counter) {
                log("\t" + values[counter]);     //NOI18N
            }
        }
        return values;
    }

    /**
     * Log an error - only used during development time.
     */
    void log(String s) {
        System.out.println(this.getClass().getName() + "::" + s); //NOI18N
    }

    /**
     * This must be called where the value is about to be rendered
     * for DB Null value support
     */
    private void recordRenderedValue(UIComponent component) {

        if (component instanceof EditableValueHolder &&
                ((EditableValueHolder) component).getSubmittedValue() == null) {
            ConversionUtilities.setRenderedValue(component,
                    ((EditableValueHolder) component).getValue());
        }
    }
}
    

    

    

            
    

            

    
    






    
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