/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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.seasar.teeda.core.render.html;

 import java.io.IOException;

 import java.net.URLEncoder;

 import java.util.Iterator;

 import javax.faces.component.UIComponent;

 import javax.faces.component.UIParameter;

 import javax.faces.component.html.HtmlOutputLink;

 import javax.faces.context.FacesContext;

 import javax.faces.context.ResponseWriter;

 import javax.faces.internal.IgnoreAttribute;

 import javax.faces.internal.WindowIdUtil;

 import org.seasar.teeda.core.JsfConstants;

 import org.seasar.teeda.core.render.AbstractRenderer;

 import org.seasar.teeda.core.render.html.support.UrlBuilder;

 import org.seasar.teeda.core.util.RendererUtil;

 import org.seasar.teeda.core.util.ValueHolderUtil;

 /**

  * @author manhole

  */

 public class HtmlOutputLinkRenderer extends AbstractRenderer {

     public static final String COMPONENT_FAMILY = "javax.faces.Output";

     public static final String RENDERER_TYPE = "javax.faces.Link";

     private final IgnoreAttribute ignoreComponent = new IgnoreAttribute();

     {

         ignoreComponent.addAttributeName(JsfConstants.ID_ATTR);

         ignoreComponent.addAttributeName(JsfConstants.VALUE_ATTR);

     }

     public void encodeBegin(FacesContext context, UIComponent component)

             throws IOException {

         assertNotNull(context, component);

         if (!component.isRendered()) {

             return;

         }

         encodeHtmlOutputLinkBegin(context, (HtmlOutputLink) component);

     }

     protected void encodeHtmlOutputLinkBegin(FacesContext context,

             HtmlOutputLink htmlOutputLink) throws IOException {

         ResponseWriter writer = context.getResponseWriter();

         final String encoding = writer.getCharacterEncoding();

         final String href = buildHref(context, htmlOutputLink, encoding);

         writer.startElement(JsfConstants.ANCHOR_ELEM, htmlOutputLink);

         RendererUtil.renderIdAttributeIfNecessary(writer, htmlOutputLink,

                 getIdForRender(context, htmlOutputLink));

         renderHref(context, writer, href);

         renderRemainAttributes(htmlOutputLink, writer, ignoreComponent);

     }

     protected void renderHref(final FacesContext context,

             final ResponseWriter writer, final String href) throws IOException {

         writer.writeURIAttribute(JsfConstants.HREF_ATTR, href, null);

     }

     protected String buildHref(FacesContext context,

             HtmlOutputLink htmlOutputLink, String encoding) throws IOException {

         UrlBuilder urlBuilder = new UrlBuilder();

         urlBuilder.setBase(ValueHolderUtil.getValueForRender(context,

                 htmlOutputLink));

         for (Iterator it = htmlOutputLink.getChildren().iterator(); it

                 .hasNext();) {

             UIComponent child = (UIComponent) it.next();

             if (child instanceof UIParameter) {

                 UIParameter parameter = (UIParameter) child;

                 urlBuilder.add(

                         URLEncoder.encode(parameter.getName(), encoding),

                         URLEncoder.encode(toBlankIfNull(parameter.getValue()),

                                 encoding));

             }

         }

         if (WindowIdUtil.isNewWindowTarget(htmlOutputLink.getTarget())) {

             urlBuilder.add(WindowIdUtil.NEWWINDOW, JsfConstants.TRUE);

         }

         return context.getExternalContext().encodeResourceURL(

                 urlBuilder.build());

     }

     protected String toBlankIfNull(final Object value) {

         if (value == null) {

             return "";

         }

         return value.toString();

     }

     public void encodeEnd(FacesContext context, UIComponent component)

             throws IOException {

         assertNotNull(context, component);

         if (!component.isRendered()) {

             return;

         }

         encodeHtmlOutputLinkEnd(context, (HtmlOutputLink) component);

     }

     protected void encodeHtmlOutputLinkEnd(FacesContext context,

             HtmlOutputLink link) throws IOException {

         ResponseWriter writer = context.getResponseWriter();

         writer.endElement(JsfConstants.ANCHOR_ELEM);

     }

     public boolean getRendersChildren() {

         return true;

     }

 }