AreaRenderer


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38  
39  package org.apache.cocoon.faces.samples.components.renderkit;
40  
41  
42  import org.apache.cocoon.faces.samples.components.components.AreaComponent;
43  import org.apache.cocoon.faces.samples.components.components.MapComponent;
44  import org.apache.cocoon.faces.samples.components.model.ImageArea;
45  
46  import javax.faces.component.UIComponent;
47  import javax.faces.context.FacesContext;
48  import javax.faces.context.ResponseWriter;
49  
50  import java.io.IOException  ;
51  
52  
53  /**
54   * This class converts the internal representation of a <code>UIArea</code>
55   * component into the output stream associated with the response to a
56   * particular request.
57   */
58  
59  public class AreaRenderer extends BaseRenderer {
60  
61  
62      // -------------------------------------------------------- Renderer Methods
63  
64  
65      /**
66       * <p>No decoding is required.</p>
67       *
68       * @param context   <code>FacesContext</code>for the current request
69       * @param component <code>UIComponent</code> to be decoded
70       */
71      public void decode(FacesContext context, UIComponent component) {
72  
73          if ((context == null) || (component == null)) {
74              throw new NullPointerException  ();
75          }
76  
77      }
78  
79  
80      /**
81       * <p>No begin encoding is required.</p>
82       *
83       * @param context   <code>FacesContext</code>for the current request
84       * @param component <code>UIComponent</code> to be decoded
85       */
86      public void encodeBegin(FacesContext context, UIComponent component)
87          throws IOException   {
88  
89          if ((context == null) || (component == null)) {
90              throw new NullPointerException  ();
91          }
92  
93      }
94  
95  
96      /**
97       * <p>No children encoding is required.</p>
98       *
99       * @param context   <code>FacesContext</code>for the current request
100      * @param component <code>UIComponent</code> to be decoded
101      */
102     public void encodeChildren(FacesContext context, UIComponent component)
103         throws IOException   {
104 
105         if ((context == null) || (component == null)) {
106             throw new NullPointerException  ();
107         }
108 
109     }
110 
111 
112     /**
113      * <p>Encode this component.</p>
114      *
115      * @param context   <code>FacesContext</code>for the current request
116      * @param component <code>UIComponent</code> to be decoded
117      */
118     public void encodeEnd(FacesContext context, UIComponent component)
119         throws IOException   {
120 
121         if ((context == null) || (component == null)) {
122             throw new NullPointerException  ();
123         }
124         AreaComponent area = (AreaComponent) component;
125         String   targetImageId =
126             area.findComponent(area.getTargetImage()).getClientId(context);
127         ImageArea iarea = (ImageArea) area.getValue();
128         ResponseWriter writer = context.getResponseWriter();
129         StringBuffer   sb = null;
130 
131         writer.startElement("area", area);
132         writer.writeAttribute("alt", iarea.getAlt(), "alt");
133         writer.writeAttribute("coords", iarea.getCoords(), "coords");
134         writer.writeAttribute("shape", iarea.getShape(), "shape");
135         // PENDING(craigmcc) - onmouseout only works on first form of a page
136         sb =
137             new StringBuffer  ("document.forms[0]['").append(targetImageId)
138             .append("'].src='");
139         sb.append(
140             getURI(context, (String  ) area.getAttributes().get("onmouseout")));
141         sb.append("'");
142         writer.writeAttribute("onmouseout", sb.toString(), "onmouseout");
143         // PENDING(craigmcc) - onmouseover only works on first form of a page
144         sb =
145             new StringBuffer  ("document.forms[0]['").append(targetImageId)
146             .append("'].src='");
147         sb.append(
148             getURI(context, (String  ) area.getAttributes().get("onmouseover")));
149         sb.append("'");
150         writer.writeAttribute("onmouseover", sb.toString(), "onmouseover");
151         // PENDING(craigmcc) - onclick only works on first form of a page
152         sb = new StringBuffer  ("document.forms[0]['");
153         sb.append(getName(context, area));
154         sb.append("'].value='");
155         sb.append(iarea.getAlt());
156         sb.append("'; document.forms[0].submit()");
157         writer.writeAttribute("onclick", sb.toString(), "value");
158         writer.endElement("area");
159 
160     }
161 
162 
163     // --------------------------------------------------------- Private Methods
164 
165 
166     /**
167      * <p>Return the calculated name for the hidden input field.</p>
168      *
169      * @param context   Context for the current request
170      * @param component Component we are rendering
171      */
172     private String   getName(FacesContext context, UIComponent component) {
173         while (component != null) {
174             if (component instanceof MapComponent) {
175                 return (component.getId() + "_current");
176             }
177             component = component.getParent();
178         }
179         throw new IllegalArgumentException  ();
180     }
181 
182 
183     /**
184      * <p>Return the path to be passed into JavaScript for the specified
185      * value.</p>
186      *
187      * @param context Context for the current request
188      * @param value   Partial path to be (potentially) modified
189      */
190     private String   getURI(FacesContext context, String   value) {
191         if (value.startsWith("/")) {
192             return (context.getExternalContext().getRequestContextPath() +
193                 value);
194         } else {
195             return (value);
196         }
197     }
198 
199 
200 }
201
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