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16 package org.apache.myfaces.wap.renderkit.wml;
17
18 import java.io.IOException  ;
19 import java.util.Iterator ;
20
21 import javax.faces.component.UIComponent;
22 import javax.faces.context.FacesContext;
23 import javax.faces.context.ResponseWriter;
24
25 import org.apache.commons.logging.Log;
26 import org.apache.commons.logging.LogFactory;
27 import org.apache.myfaces.wap.component.PanelGrid;
28 import org.apache.myfaces.wap.renderkit.Attributes;
29 import org.apache.myfaces.wap.renderkit.RendererUtils;
30 import org.apache.myfaces.wap.renderkit.WmlRenderer;
31
32
33
41 public class GridRenderer extends WmlRenderer {
42 private static Log log = LogFactory.getLog(GridRenderer.class);
43
44
45 public GridRenderer() {
46 super();
47 log.debug("created object " + this.getClass().getName());
48 }
49
50 public boolean getRendersChildren(){
51 return(true);
52 }
53
54 public void encodeBegin(FacesContext context, UIComponent component) throws java.io.IOException {
55 log.debug("encodeBegin(" + component.getId() + ")");
56
57 if (context == null || component == null) {
58 throw new NullPointerException ();
59 }
60 if (!component.isRendered()) return;
61 }
63
64 public void encodeChildren(FacesContext context, UIComponent component) throws java.io.IOException {
65 log.debug("encodeChildren(" + component.getId() + ")");
66 if (context == null || component == null) {
67 throw new NullPointerException ();
68 }
69 if (!component.isRendered()) return;
70 }
72
73 public void encodeEnd(FacesContext context, UIComponent component) throws java.io.IOException {
74 log.debug("encodeEnd(" + component.getId() + ")");
75 if (context == null || component == null) {
76 throw new NullPointerException ();
77 }
78 if (!component.isRendered()) return;
79
80 ResponseWriter writer = context.getResponseWriter();
81 PanelGrid comp = (PanelGrid)component;
82 int columns = getColumnsNumber(comp.getColumns());
83
84 if (!hasTableAnyContext(context, component)) return;
86
87 writer.startElement(Attributes.TABLE, component);
88 RendererUtils.writeAttribute(Attributes.ID, comp.getClientId(context), writer);
89 RendererUtils.writeAttribute(Attributes.CLASS, comp.getStyleClass(), writer);
90 RendererUtils.writeAttribute(Attributes.XML_LANG, comp.getXmllang(), writer);
91
92 RendererUtils.writeAttribute(Attributes.ALIGN, comp.getAlign(), writer);
93 RendererUtils.writeAttribute(Attributes.COLUMNS, comp.getColumns(), writer);
94 RendererUtils.writeAttribute(Attributes.TITLE, comp.getTitle(), writer);
95
96 renderHeaderOrFooter(context, component, Attributes.HEADER, columns);
97
98 renderChildern(context, component, columns);
99
100 renderHeaderOrFooter(context, component, Attributes.FOOTER, columns);
101
102 writer.endElement(Attributes.TABLE);
103 }
104
105 public void decode(FacesContext context, UIComponent component) {
106 if (component == null ) throw new NullPointerException ();
107 }
108
109 private void renderChildern(FacesContext context, UIComponent component, int maxColumn) throws IOException {
110 ResponseWriter writer = context.getResponseWriter();
111 int column = 0, row = 0;
112 boolean rowStarted = false;
113
114 Iterator childn = component.getChildren().iterator();
115 while (childn.hasNext()){
116 if (!rowStarted) {
117 writer.startElement(Attributes.TR, component);
118 rowStarted = true; column = 0; row = 1;
119 }
120
121 writer.startElement(Attributes.TD, component);
123 RendererUtils.renderChild(context, (UIComponent)childn.next());
124 writer.endElement(Attributes.TD);
125 column++;
126
127 if (column >= maxColumn) {
129 writer.endElement(Attributes.TR);
130 rowStarted = false;
131 }
132 }
133
134 if (rowStarted) writeRowEnd(component, writer, column, maxColumn);
135 }
136
137
145 private void renderHeaderOrFooter(FacesContext context, UIComponent component, String str, int maxColumn) throws IOException {
146 ResponseWriter writer = context.getResponseWriter();
147 UIComponent facet = component.getFacet(str);
148
149 int column = 0;
150 boolean rowStarted = false;
151
152 if (facet == null) return;
153
154 log.debug("Facet " + str + " is not null. Child numb:" + facet.getChildCount());
155 Iterator childn = facet.getChildren().iterator();
156
157 if (childn.hasNext()){
159 writer.startElement(Attributes.TR, component);
160 rowStarted = true;
161 }
162
163 while (childn.hasNext()){
165 writer.startElement(Attributes.TD, component);
166 RendererUtils.renderChild(context, (UIComponent)childn.next());
168 writer.endElement(Attributes.TD);
169 column++;
170 }
171
172 if (rowStarted) writeRowEnd(component, writer, column, maxColumn);
173 }
174
175
183 private void writeRowEnd(UIComponent component, ResponseWriter writer, int column, int maxColumn) throws IOException {
184 while (column < maxColumn) {
185 writer.startElement(Attributes.TD, component);
186 writer.endElement(Attributes.TD);
187 column++;
188 }
189 writer.endElement(Attributes.TR);
190 }
191
192
193 private boolean hasTableAnyContext(FacesContext context, UIComponent component){
194 boolean hasHeader = component.getFacet(Attributes.HEADER) != null;
195 boolean hasBody = component.getChildCount() > 0;
196 boolean hasFooter = component.getFacet(Attributes.FOOTER) != null;
197
198 return (hasHeader || hasBody || hasFooter);
199 }
200
201
202 private int getColumnsNumber(String columns){
203 int number;
204 try {
205 number = Integer.parseInt(columns);
206 } catch (NumberFormatException ex){
207 return (0);
208 }
209 return (number);
210 }
211 }
212
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