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1
16 package org.apache.myfaces.renderkit.html;
17
18 import org.apache.myfaces.renderkit.JSFAttr;
19 import org.apache.myfaces.renderkit.RendererUtils;
20
21 import org.apache.commons.logging.Log;
22 import org.apache.commons.logging.LogFactory;
23
24 import javax.faces.component.UIComponent;
25 import javax.faces.component.UINamingContainer;
26 import javax.faces.component.ValueHolder;
27 import javax.faces.component.html.HtmlOutputLabel;
28 import javax.faces.context.FacesContext;
29 import javax.faces.context.ResponseWriter;
30 import java.io.IOException  ;
31
32
33
67 public class HtmlLabelRenderer
68 extends HtmlRenderer
69 {
70 private static final Log log = LogFactory.getLog(HtmlLabelRenderer.class);
71
72 public void encodeBegin(FacesContext facesContext, UIComponent uiComponent)
73 throws IOException
74 {
75 super.encodeBegin(facesContext, uiComponent);
77 ResponseWriter writer = facesContext.getResponseWriter();
78
79 encodeBefore(facesContext, writer, uiComponent);
80
81 writer.startElement(HTML.LABEL_ELEM, uiComponent);
82 HtmlRendererUtils.writeIdIfNecessary(writer, uiComponent, facesContext);
83 HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent, HTML.LABEL_PASSTHROUGH_ATTRIBUTES);
84
85 String forAttr = getFor(uiComponent);
86 if (forAttr == null)
87 {
88 throw new NullPointerException ("Attribute 'for' of label component with id " + uiComponent.getClientId(facesContext));
89 }
90
91 UIComponent forComponent = uiComponent.findComponent(forAttr);
92 if (forComponent == null)
93 {
94 if (log.isWarnEnabled())
95 {
96 log.warn("Unable to find component '" + forAttr + "' (calling findComponent on component '" + uiComponent.getClientId(facesContext) + "')");
97 }
98 if (forAttr.length() > 0 && forAttr.charAt(0) == UINamingContainer.SEPARATOR_CHAR)
99 {
100 writer.writeAttribute(HTML.FOR_ATTR, forAttr.substring(1), JSFAttr.FOR_ATTR);
102 }
103 else
104 {
105 String labelClientId = uiComponent.getClientId(facesContext);
107 int colon = labelClientId.lastIndexOf(UINamingContainer.SEPARATOR_CHAR);
108 if (colon == -1)
109 {
110 writer.writeAttribute(HTML.FOR_ATTR, forAttr, JSFAttr.FOR_ATTR);
111 }
112 else
113 {
114 writer.writeAttribute(HTML.FOR_ATTR, labelClientId.substring(0, colon + 1) + forAttr, JSFAttr.FOR_ATTR);
115 }
116 }
117 }
118 else
119 {
120 writer.writeAttribute(HTML.FOR_ATTR, forComponent.getClientId(facesContext), JSFAttr.FOR_ATTR);
121 }
122
123
124 if (uiComponent instanceof ValueHolder)
127 {
128 String text = RendererUtils.getStringValue(facesContext, uiComponent);
129 if(text != null)
130 {
131 writer.writeText(text, "value");
132 }
133 }
134
135 writer.flush();
137 encodeAfterStart(facesContext,writer,uiComponent);
138 }
139
140 protected void encodeAfterStart(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)
141 throws IOException
142 {
143 }
144
145 protected void encodeBefore(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)
146 throws IOException
147 {
148 }
149
150
151 protected String getFor(UIComponent component)
152 {
153 if (component instanceof HtmlOutputLabel)
154 {
155 return ((HtmlOutputLabel)component).getFor();
156 }
157 else
158 {
159 return (String )component.getAttributes().get(JSFAttr.FOR_ATTR);
160 }
161 }
162
163
164 public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)
165 throws IOException
166 {
167 super.encodeEnd(facesContext, uiComponent);
169 ResponseWriter writer = facesContext.getResponseWriter();
170
171 encodeBeforeEnd(facesContext, writer, uiComponent);
172
173 writer.endElement(HTML.LABEL_ELEM);
174
175 encodeAfter(facesContext, writer, uiComponent);
176 }
177
178 protected void encodeBeforeEnd(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)
179 throws IOException
180 {
181 }
182
183 protected void encodeAfter(FacesContext facesContext, ResponseWriter writer, UIComponent uiComponent)
184 throws IOException
185 {
186 }
187 }
188 |
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