empire-db-jsf2/src/main/java/org/apache/empire/jsf2/components/LinkTag.java - empire-db - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you 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.apache.empire.jsf2.components;

 import java.io.IOException;
 import java.util.List;
 import java.util.Map;

 import javax.faces.component.UIComponent;
 import javax.faces.component.UINamingContainer;
 import javax.faces.component.UIOutput;
 import javax.faces.component.UIPanel;
 import javax.faces.component.UIParameter;
 import javax.faces.component.html.HtmlGraphicImage;
 import javax.faces.component.html.HtmlOutcomeTargetLink;
 import javax.faces.component.visit.VisitCallback;
 import javax.faces.component.visit.VisitContext;
 import javax.faces.context.FacesContext;
 import javax.faces.context.ResponseWriter;

 import org.apache.empire.commons.ObjectUtils;
 import org.apache.empire.commons.StringUtils;
 import org.apache.empire.data.DataType;
 import org.apache.empire.exceptions.InvalidPropertyException;
 import org.apache.empire.jsf2.app.FacesUtils;
 import org.apache.empire.jsf2.controls.InputControl;
 import org.apache.empire.jsf2.controls.InputControlManager;
 import org.apache.empire.jsf2.utils.ParameterMap;
 import org.apache.empire.jsf2.utils.StringResponseWriter;
 import org.apache.empire.jsf2.utils.TagEncodingHelper;
 import org.apache.empire.jsf2.utils.TagEncodingHelperFactory;
 import org.apache.myfaces.shared.renderkit.html.HTML;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 public class LinkTag extends UIOutput // implements NamingContainer
 {
     // or HtmlOutcomeTargetLink
     // or HtmlOutputLink
     // or rather extend UIOutcomeTarget ?

     /*
     <h:link value="#{msg.menu_bookinglist}"
             outcome="/pages/bookings/bookingList.xhtml?faces-redirect=true" >
         <f:param name="action" value="doInit"/>
     </h:link>
      */

     // Logger
     private static final Logger log = LoggerFactory.getLogger(LinkTag.class);

     protected final TagEncodingHelper helper = TagEncodingHelperFactory.create(this, "eLink");

     private boolean creatingComponents = false;

     private boolean encodeLinkChildren = false;

     private String disabledTagName;

     public LinkTag()
     {
         log.trace("component link created");
     }

     @Override
     public String getFamily()
     {
         return UINamingContainer.COMPONENT_FAMILY;
     }

     /**
      * remember original clientId
      * necessary only inside UIData
      */
     private String treeClientId = null;

     @Override
     public void setId(String id)
     {   // empty?
         if(StringUtils.isEmpty(id))
         {   // Generate unique id
             Object page = getAttributes().get("page");
             String outcome = StringUtils.toString(page);
             if (StringUtils.isEmpty(outcome))
                 throw new InvalidPropertyException("page", page);
             ParameterMap pm = FacesUtils.getParameterMap(FacesUtils.getContext());
             id = pm.encodeString(outcome);
         }
         // set
         super.setId(id);
     }

     @Override
     public boolean visitTree(VisitContext visitContext, VisitCallback callback)
     {
         FacesContext context = visitContext.getFacesContext();
         treeClientId = this.getClientId(context);
         return super.visitTree(visitContext, callback);
     }

     @Override
     public String getClientId(FacesContext context)
     {
         // Check if dynamic components are being created
         if (this.treeClientId!=null && this.creatingComponents)
         {   // return the original tree client id
             return treeClientId;
         }
         // default behavior
         return super.getClientId(context);
     }

     @Override
     public void encodeBegin(FacesContext context)
         throws IOException
     {
         // add label and input components when the view is loaded for the first time
         super.encodeBegin(context);

         // begin
         helper.encodeBegin();
         if (isLinkDisabled())
         {   // render disabled
             ResponseWriter writer = context.getResponseWriter();
             Object linkValue = getLinkValue(helper.hasColumn());
             this.disabledTagName = writeStartElement(writer);
             this.encodeLinkChildren = isEncodeLinkChildren(linkValue);
             if (!encodeLinkChildren)
             {   writer.write(StringUtils.toString(linkValue, ""));
                 writer.endElement(this.disabledTagName);
             }
         }
         else
         {   // Add component
             HtmlOutcomeTargetLink linkComponent = null;
             if (getChildCount() > 0)
             {
                 UIComponent c = getChildren().get(0);
                 if (c instanceof HtmlOutcomeTargetLink)
                 {   // reuse
                     linkComponent = (HtmlOutcomeTargetLink)c;
                     helper.restoreComponentId(linkComponent);
                     // check image
                     if (linkComponent.getChildCount()>0)
                     {   // Check HtmlGraphicImage
                         int last = linkComponent.getChildCount()-1;
                         UIComponent lcc = linkComponent.getChildren().get(last);
                         if (lcc instanceof HtmlGraphicImage)
                             helper.restoreComponentId(lcc);
                     }
                 }
                 else
                 {   // Something's wrong here?
                     log.info("INFO: Unexpected child node for {}! Child item type is {}.", getClass().getName(), c.getClass().getName());
                     // Check facetComponent
                     UIPanel facetComponent = (UIPanel)getFacets().get(UIComponent.COMPOSITE_FACET_NAME);
                     if (facetComponent==null)
                     {
                         log.warn("WARN: component's facetComponent has not been set! Using Default (javax.faces.Panel).");
                         log.warn("Problem might be related to Mojarra's state context saving for dynamic components (affects all versions > 2.1.6). See com.sun.faces.context.StateContext.java:AddRemoveListener");
                         facetComponent = (UIPanel)context.getApplication().createComponent("javax.faces.Panel");
                         facetComponent.setRendererType("javax.faces.Group");
                         getFacets().put(UIComponent.COMPOSITE_FACET_NAME, facetComponent);
                     }
                 }
             }
             if (linkComponent == null)
             {   try {
                     creatingComponents = true;
                     linkComponent = createOutcomeTargetLink(context);
                     this.getChildren().add(0, linkComponent);
                     helper.saveComponentId(linkComponent);
                     // encode image
                     String imagePath = helper.getTagAttributeString("image");
                     if (StringUtils.isNotEmpty(imagePath))
                     {   // Create image
                         HtmlGraphicImage img = encodeImage(context, linkComponent, imagePath);
                         linkComponent.getChildren().add(img);
                         helper.saveComponentId(linkComponent);
                     }
                     // done
                 } finally {
                     creatingComponents = false;
                 }
             }
             // set params
             setLinkProperties(linkComponent);
             addOrSetParam(linkComponent, "idparam", "id");
             // encode link
             this.encodeLinkChildren = isEncodeLinkChildren(linkComponent.getChildCount()>0 ? null : linkComponent.getValue());
             if (this.encodeLinkChildren)
                 linkComponent.encodeBegin(context);
             else
             {   // default rendering (no children)
                 linkComponent.setRendered(true);
                 linkComponent.encodeAll(context);
                 linkComponent.setRendered(false); // Don't render twice!
             }
         }
     }

     @Override
     public void encodeChildren(FacesContext context) throws IOException
     {
         // render
         if (this.encodeLinkChildren)
             super.encodeChildren(context);
     }

     /**
      * required for MenuItemTag
      * @param context
      * @throws IOException
      */
     public void forceEncodeChildren(FacesContext context) throws IOException
     {
         super.encodeChildren(context);
     }

     @Override
     public void encodeEnd(FacesContext context) throws IOException
     {
         if (this.encodeLinkChildren)
         {
             if (isLinkDisabled())
             {   // Disabled
                 ResponseWriter writer = context.getResponseWriter();
                 writer.endElement(StringUtils.coalesce(this.disabledTagName, HTML.SPAN_ELEM));
             }
             else
             {   // Enabled
                 HtmlOutcomeTargetLink link = getLinkComponent();
                 if (link!=null && link.isRendered())
                     link.encodeEnd(context);
             }
         }
         // done
         super.encodeEnd(context);
     }

     protected String getLinkStyleClass()
     {
         return StringUtils.toString(getAttributes().get("styleClass"));
     }

     protected boolean isLinkDisabled()
     {
         Object v = getAttributes().get("disabled");
         if (v==null)
             return false;
         // return disabled attribute
         return ObjectUtils.getBoolean(v);
     }

     protected Object getLinkValue(boolean hasColumn)
     {
         // Is a column provided?
         if (hasColumn)
         {
             helper.prepareData();
             InputControl control = helper.getInputControl();
             InputControl.ValueInfo vi = helper.getValueInfo(FacesContext.getCurrentInstance());
             // render value
             StringResponseWriter srw = new StringResponseWriter();
             try
             {
                 control.renderValue(vi, srw);
             }
             catch (IOException e)
             {   // Error rendering value
                 log.error("Failed to render value for "+vi.getColumn().getName()+" error is:"+e.getMessage(), e);
             }
             return srw.toString();
         }
         else
         {   // An ordinary link
             String text = helper.getTagAttributeString("text");
             if (text!=null)
                 return helper.getTextResolver(FacesContext.getCurrentInstance()).resolveText(text);
             // Use value
             Object value = getValue();
             return value;
         }
     }

     protected void setLinkProperties(HtmlOutcomeTargetLink link)
     {
         boolean hasColumn = helper.hasColumn();
         Object value = getLinkValue(hasColumn);
         link.setValue(value);
         // id
         String id = getId();
         if (id.startsWith("j_")==false)
             link.setId(id+"_a");
         // css Style
         DataType dataType = (hasColumn ? helper.getColumn().getDataType() : DataType.UNKNOWN);
         link.setStyleClass(helper.getTagStyleClass(dataType, null, getLinkStyleClass()));
         // Set Attributes
         Map<String,Object> attr = getAttributes();
         // Set outcome
         Object page = attr.get("page");
         String outcome = StringUtils.toString(page);
         link.setOutcome(outcome);
         // Copy attributes
         if ((value=attr.get("style"))!=null)
             link.setStyle(StringUtils.toString(value));
         if ((value=attr.get("tabindex"))!=null)
             link.setTabindex(StringUtils.toString(value));
         if ((value=attr.get("onclick"))!=null)
             link.setOnclick(StringUtils.toString(value));
         // title
         String title = helper.getTagAttributeString("title");
         if (StringUtils.isNotEmpty(title))
             link.setTitle(title);
         // include view param
         link.setIncludeViewParams(false);
     }

     protected void addOrSetParam(HtmlOutcomeTargetLink link, String attribute, String paramName)
     {
         // Get Attribute
         String paramValue = StringUtils.toString(getAttributes().get(attribute));
         if (StringUtils.isEmpty(paramValue))
             return;
         // find attribute
         List<UIComponent> l = link.getChildren();
         for (UIComponent c : l)
         {
             if (!(c instanceof UIParameter))
                 continue;
             UIParameter p = (UIParameter)c;
             if (p.getName().equalsIgnoreCase(paramName))
             {   // param existis
                 p.setValue(paramValue);
                 return;
             }
         }
         // Not found, hence add
         UIParameter param = new UIParameter();
         param.setName(paramName);
         param.setValue(paramValue);
         link.getChildren().add(param);
         helper.resetComponentId(param);
     }

     protected String writeStartElement(ResponseWriter writer)
         throws IOException
     {
         Map<String, Object> map = getAttributes();
         String tagName  = StringUtils.coalesce(StringUtils.toString(map.get("tag")), "span");
         String cssClass = helper.getTagStyleClass();
         Object style = map.get("style");
         Object title = helper.getTagAttributeValue("title");
         // Write tag
         writer.startElement(tagName, this);
         helper.writeAttribute(writer, "class", cssClass);
         helper.writeAttribute(writer, "style", style);
         helper.writeAttribute(writer, "title", helper.hasColumn() ? helper.getValueTooltip(title) : title);
         return tagName;
     }

     protected HtmlOutcomeTargetLink createOutcomeTargetLink(FacesContext context)
     {
         // OutcomeTargetLink link
         HtmlOutcomeTargetLink link = InputControlManager.createComponent(context, HtmlOutcomeTargetLink.class);
         return link;
     }

     protected HtmlGraphicImage encodeImage(FacesContext context, HtmlOutcomeTargetLink parent, String imagePath)
     {
         HtmlGraphicImage img = InputControlManager.createComponent(context, HtmlGraphicImage.class);
         img.setValue(imagePath);
         return img;
     }

     /*
      * public String getLabelValue()
      * {
      * return StringUtils.toString(getValue());
      * }
      * public String getPageValue()
      * {
      * return (String) getAttributes().get("page");
      * }
      * public String getActionValue()
      * {
      * return (String) getAttributes().get("action");
      * }
      */

     protected boolean isEncodeLinkChildren(Object linkValue)
     {
         return ObjectUtils.isEmpty(linkValue);
     }

     protected HtmlOutcomeTargetLink getLinkComponent()
     {
         return (getChildCount()>0 ? (HtmlOutcomeTargetLink)getChildren().get(0) : null);
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you 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.apache.empire.jsf2.components;

	import java.io.IOException;
	import java.util.List;
	import java.util.Map;

	import javax.faces.component.UIComponent;
	import javax.faces.component.UINamingContainer;
	import javax.faces.component.UIOutput;
	import javax.faces.component.UIPanel;
	import javax.faces.component.UIParameter;
	import javax.faces.component.html.HtmlGraphicImage;
	import javax.faces.component.html.HtmlOutcomeTargetLink;
	import javax.faces.component.visit.VisitCallback;
	import javax.faces.component.visit.VisitContext;
	import javax.faces.context.FacesContext;
	import javax.faces.context.ResponseWriter;

	import org.apache.empire.commons.ObjectUtils;
	import org.apache.empire.commons.StringUtils;
	import org.apache.empire.data.DataType;
	import org.apache.empire.exceptions.InvalidPropertyException;
	import org.apache.empire.jsf2.app.FacesUtils;
	import org.apache.empire.jsf2.controls.InputControl;
	import org.apache.empire.jsf2.controls.InputControlManager;
	import org.apache.empire.jsf2.utils.ParameterMap;
	import org.apache.empire.jsf2.utils.StringResponseWriter;
	import org.apache.empire.jsf2.utils.TagEncodingHelper;
	import org.apache.empire.jsf2.utils.TagEncodingHelperFactory;
	import org.apache.myfaces.shared.renderkit.html.HTML;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	public class LinkTag extends UIOutput // implements NamingContainer
	{
	// or HtmlOutcomeTargetLink
	// or HtmlOutputLink
	// or rather extend UIOutcomeTarget ?

	/*
	<h:link value="#{msg.menu_bookinglist}"
	outcome="/pages/bookings/bookingList.xhtml?faces-redirect=true" >
	<f:param name="action" value="doInit"/>
	</h:link>
	*/

	// Logger
	private static final Logger log = LoggerFactory.getLogger(LinkTag.class);

	protected final TagEncodingHelper helper = TagEncodingHelperFactory.create(this, "eLink");

	private boolean creatingComponents = false;

	private boolean encodeLinkChildren = false;

	private String disabledTagName;

	public LinkTag()
	{
	log.trace("component link created");
	}

	@Override
	public String getFamily()
	{
	return UINamingContainer.COMPONENT_FAMILY;
	}

	/**
	* remember original clientId
	* necessary only inside UIData
	*/
	private String treeClientId = null;

	@Override
	public void setId(String id)
	{ // empty?
	if(StringUtils.isEmpty(id))
	{ // Generate unique id
	Object page = getAttributes().get("page");
	String outcome = StringUtils.toString(page);
	if (StringUtils.isEmpty(outcome))
	throw new InvalidPropertyException("page", page);
	ParameterMap pm = FacesUtils.getParameterMap(FacesUtils.getContext());
	id = pm.encodeString(outcome);
	}
	// set
	super.setId(id);
	}

	@Override
	public boolean visitTree(VisitContext visitContext, VisitCallback callback)
	{
	FacesContext context = visitContext.getFacesContext();
	treeClientId = this.getClientId(context);
	return super.visitTree(visitContext, callback);
	}

	@Override
	public String getClientId(FacesContext context)
	{
	// Check if dynamic components are being created
	if (this.treeClientId!=null && this.creatingComponents)
	{ // return the original tree client id
	return treeClientId;
	}
	// default behavior
	return super.getClientId(context);
	}

	@Override
	public void encodeBegin(FacesContext context)
	throws IOException
	{
	// add label and input components when the view is loaded for the first time
	super.encodeBegin(context);

	// begin
	helper.encodeBegin();
	if (isLinkDisabled())
	{ // render disabled
	ResponseWriter writer = context.getResponseWriter();
	Object linkValue = getLinkValue(helper.hasColumn());
	this.disabledTagName = writeStartElement(writer);
	this.encodeLinkChildren = isEncodeLinkChildren(linkValue);
	if (!encodeLinkChildren)
	{ writer.write(StringUtils.toString(linkValue, ""));
	writer.endElement(this.disabledTagName);
	}
	}
	else
	{ // Add component
	HtmlOutcomeTargetLink linkComponent = null;
	if (getChildCount() > 0)
	{
	UIComponent c = getChildren().get(0);
	if (c instanceof HtmlOutcomeTargetLink)
	{ // reuse
	linkComponent = (HtmlOutcomeTargetLink)c;
	helper.restoreComponentId(linkComponent);
	// check image
	if (linkComponent.getChildCount()>0)
	{ // Check HtmlGraphicImage
	int last = linkComponent.getChildCount()-1;
	UIComponent lcc = linkComponent.getChildren().get(last);
	if (lcc instanceof HtmlGraphicImage)
	helper.restoreComponentId(lcc);
	}
	}
	else
	{ // Something's wrong here?
	log.info("INFO: Unexpected child node for {}! Child item type is {}.", getClass().getName(), c.getClass().getName());
	// Check facetComponent
	UIPanel facetComponent = (UIPanel)getFacets().get(UIComponent.COMPOSITE_FACET_NAME);
	if (facetComponent==null)
	{
	log.warn("WARN: component's facetComponent has not been set! Using Default (javax.faces.Panel).");
	log.warn("Problem might be related to Mojarra's state context saving for dynamic components (affects all versions > 2.1.6). See com.sun.faces.context.StateContext.java:AddRemoveListener");
	facetComponent = (UIPanel)context.getApplication().createComponent("javax.faces.Panel");
	facetComponent.setRendererType("javax.faces.Group");
	getFacets().put(UIComponent.COMPOSITE_FACET_NAME, facetComponent);
	}
	}
	}
	if (linkComponent == null)
	{ try {
	creatingComponents = true;
	linkComponent = createOutcomeTargetLink(context);
	this.getChildren().add(0, linkComponent);
	helper.saveComponentId(linkComponent);
	// encode image
	String imagePath = helper.getTagAttributeString("image");
	if (StringUtils.isNotEmpty(imagePath))
	{ // Create image
	HtmlGraphicImage img = encodeImage(context, linkComponent, imagePath);
	linkComponent.getChildren().add(img);
	helper.saveComponentId(linkComponent);
	}
	// done
	} finally {
	creatingComponents = false;
	}
	}
	// set params
	setLinkProperties(linkComponent);
	addOrSetParam(linkComponent, "idparam", "id");
	// encode link
	this.encodeLinkChildren = isEncodeLinkChildren(linkComponent.getChildCount()>0 ? null : linkComponent.getValue());
	if (this.encodeLinkChildren)
	linkComponent.encodeBegin(context);
	else
	{ // default rendering (no children)
	linkComponent.setRendered(true);
	linkComponent.encodeAll(context);
	linkComponent.setRendered(false); // Don't render twice!
	}
	}
	}

	@Override
	public void encodeChildren(FacesContext context) throws IOException
	{
	// render
	if (this.encodeLinkChildren)
	super.encodeChildren(context);
	}

	/**
	* required for MenuItemTag
	* @param context
	* @throws IOException
	*/
	public void forceEncodeChildren(FacesContext context) throws IOException
	{
	super.encodeChildren(context);
	}

	@Override
	public void encodeEnd(FacesContext context) throws IOException
	{
	if (this.encodeLinkChildren)
	{
	if (isLinkDisabled())
	{ // Disabled
	ResponseWriter writer = context.getResponseWriter();
	writer.endElement(StringUtils.coalesce(this.disabledTagName, HTML.SPAN_ELEM));
	}
	else
	{ // Enabled
	HtmlOutcomeTargetLink link = getLinkComponent();
	if (link!=null && link.isRendered())
	link.encodeEnd(context);
	}
	}
	// done
	super.encodeEnd(context);
	}

	protected String getLinkStyleClass()
	{
	return StringUtils.toString(getAttributes().get("styleClass"));
	}

	protected boolean isLinkDisabled()
	{
	Object v = getAttributes().get("disabled");
	if (v==null)
	return false;
	// return disabled attribute
	return ObjectUtils.getBoolean(v);
	}

	protected Object getLinkValue(boolean hasColumn)
	{
	// Is a column provided?
	if (hasColumn)
	{
	helper.prepareData();
	InputControl control = helper.getInputControl();
	InputControl.ValueInfo vi = helper.getValueInfo(FacesContext.getCurrentInstance());
	// render value
	StringResponseWriter srw = new StringResponseWriter();
	try
	{
	control.renderValue(vi, srw);
	}
	catch (IOException e)
	{ // Error rendering value
	log.error("Failed to render value for "+vi.getColumn().getName()+" error is:"+e.getMessage(), e);
	}
	return srw.toString();
	}
	else
	{ // An ordinary link
	String text = helper.getTagAttributeString("text");
	if (text!=null)
	return helper.getTextResolver(FacesContext.getCurrentInstance()).resolveText(text);
	// Use value
	Object value = getValue();
	return value;
	}
	}

	protected void setLinkProperties(HtmlOutcomeTargetLink link)
	{
	boolean hasColumn = helper.hasColumn();
	Object value = getLinkValue(hasColumn);
	link.setValue(value);
	// id
	String id = getId();
	if (id.startsWith("j_")==false)
	link.setId(id+"_a");
	// css Style
	DataType dataType = (hasColumn ? helper.getColumn().getDataType() : DataType.UNKNOWN);
	link.setStyleClass(helper.getTagStyleClass(dataType, null, getLinkStyleClass()));
	// Set Attributes
	Map<String,Object> attr = getAttributes();
	// Set outcome
	Object page = attr.get("page");
	String outcome = StringUtils.toString(page);
	link.setOutcome(outcome);
	// Copy attributes
	if ((value=attr.get("style"))!=null)
	link.setStyle(StringUtils.toString(value));
	if ((value=attr.get("tabindex"))!=null)
	link.setTabindex(StringUtils.toString(value));
	if ((value=attr.get("onclick"))!=null)
	link.setOnclick(StringUtils.toString(value));
	// title
	String title = helper.getTagAttributeString("title");
	if (StringUtils.isNotEmpty(title))
	link.setTitle(title);
	// include view param
	link.setIncludeViewParams(false);
	}

	protected void addOrSetParam(HtmlOutcomeTargetLink link, String attribute, String paramName)
	{
	// Get Attribute
	String paramValue = StringUtils.toString(getAttributes().get(attribute));
	if (StringUtils.isEmpty(paramValue))
	return;
	// find attribute
	List<UIComponent> l = link.getChildren();
	for (UIComponent c : l)
	{
	if (!(c instanceof UIParameter))
	continue;
	UIParameter p = (UIParameter)c;
	if (p.getName().equalsIgnoreCase(paramName))
	{ // param existis
	p.setValue(paramValue);
	return;
	}
	}
	// Not found, hence add
	UIParameter param = new UIParameter();
	param.setName(paramName);
	param.setValue(paramValue);
	link.getChildren().add(param);
	helper.resetComponentId(param);
	}

	protected String writeStartElement(ResponseWriter writer)
	throws IOException
	{
	Map<String, Object> map = getAttributes();
	String tagName = StringUtils.coalesce(StringUtils.toString(map.get("tag")), "span");
	String cssClass = helper.getTagStyleClass();
	Object style = map.get("style");
	Object title = helper.getTagAttributeValue("title");
	// Write tag
	writer.startElement(tagName, this);
	helper.writeAttribute(writer, "class", cssClass);
	helper.writeAttribute(writer, "style", style);
	helper.writeAttribute(writer, "title", helper.hasColumn() ? helper.getValueTooltip(title) : title);
	return tagName;
	}

	protected HtmlOutcomeTargetLink createOutcomeTargetLink(FacesContext context)
	{
	// OutcomeTargetLink link
	HtmlOutcomeTargetLink link = InputControlManager.createComponent(context, HtmlOutcomeTargetLink.class);
	return link;
	}

	protected HtmlGraphicImage encodeImage(FacesContext context, HtmlOutcomeTargetLink parent, String imagePath)
	{
	HtmlGraphicImage img = InputControlManager.createComponent(context, HtmlGraphicImage.class);
	img.setValue(imagePath);
	return img;
	}

	/*
	* public String getLabelValue()
	* {
	* return StringUtils.toString(getValue());
	* }
	* public String getPageValue()
	* {
	* return (String) getAttributes().get("page");
	* }
	* public String getActionValue()
	* {
	* return (String) getAttributes().get("action");
	* }
	*/

	protected boolean isEncodeLinkChildren(Object linkValue)
	{
	return ObjectUtils.isEmpty(linkValue);
	}

	protected HtmlOutcomeTargetLink getLinkComponent()
	{
	return (getChildCount()>0 ? (HtmlOutcomeTargetLink)getChildren().get(0) : null);
	}
	}