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16 package org.apache.myfaces.custom.jsvalueset;
17
18 import org.apache.myfaces.renderkit.RendererUtils;
19 import org.apache.myfaces.renderkit.html.HTML;
20 import org.apache.myfaces.renderkit.html.HtmlRenderer;
21
22 import javax.faces.application.Application;
23 import javax.faces.component.UIComponent;
24 import javax.faces.context.FacesContext;
25 import javax.faces.context.ResponseWriter;
26 import java.io.IOException  ;
27 import java.util.Collection ;
28 import java.util.Iterator ;
29 import java.util.Map ;
30
31
46 public class HtmlJsValueSetRenderer
47 extends HtmlRenderer
48 {
49 public void encodeEnd(FacesContext facesContext, UIComponent component)
50 throws IOException
51 {
52 RendererUtils.checkParamValidity(facesContext, component, HtmlJsValueSet.class);
53
54 HtmlJsValueSet htmlJsValueSet = (HtmlJsValueSet) component;
55
56 Object value = htmlJsValueSet.getValue();
57 String name = htmlJsValueSet.getName();
58
59
60 ResponseWriter writer = getFacesContext().getResponseWriter();
61
62 writer.startElement(HTML.SCRIPT_ELEM,null);
63 writer.writeAttribute(HTML.SCRIPT_TYPE_ATTR,HTML.SCRIPT_TYPE_TEXT_JAVASCRIPT,null);
64
65 if(value instanceof String ||
66 value instanceof Number || value instanceof Boolean || value == null)
67 {
68 writer.writeText("var " + name+"="+getValueString(value)+";",null);
69 }
70 else if(value instanceof Object [])
71 {
72 Object [] objs = (Object []) value;
73
74 startArray(writer, name);
75
76 for (int i = 0; i < objs.length; i++)
77 {
78 Object obj = objs[i];
79 writeArrayElement(writer, name, i, obj);
80 }
81 }
82 else if(value instanceof Collection )
83 {
84 Collection coll = (Collection ) value;
85
86 startArray(writer, name);
87
88 int i=0;
89
90 for (Iterator iterator = coll.iterator(); iterator.hasNext();)
91 {
92 Object obj = iterator.next();
93 writeArrayElement(writer, name, i, obj);
94 i++;
95 }
96 }
97 else if(value instanceof Map )
98 {
99 Map map = (Map ) value;
100 Iterator it = map.entrySet().iterator();
101
102 startArray(writer,name);
103
104 while (it.hasNext())
105 {
106 Map.Entry entry = (Map.Entry ) it.next();
107 writeArrayElement(writer, name, entry.getKey(), entry.getValue());
108 }
109 }
110 else
111 throw new IOException ("Type of value not handled. Allowed are String, Number, Boolean, Object[], Collection, Map. Type of value : "+value.getClass());
112
113
114 writer.endElement(HTML.SCRIPT_ELEM);
115 }
116
117 private void writeArrayElement(ResponseWriter writer, String name, Object key, Object obj)
118 throws IOException
119 {
120 String prefix = name+"["+getValueString(key)+"]";
121
122 if(obj instanceof Map )
123 {
124 writer.writeText(prefix + "= new Array();",null);
125
126 Iterator it = ((Map ) obj).entrySet().iterator();
127
128 while (it.hasNext())
129 {
130 Map.Entry entry = (Map.Entry ) it.next();
131
132 writeArrayElement(writer,prefix,entry.getKey(),entry.getValue());
133 }
134 }
135 else
136 {
137 writer.writeText(prefix + "="+getValueString(obj)+";",null);
138 }
139 }
140
141 private void writeArrayElement(ResponseWriter writer, String name, int i, Object obj)
142 throws IOException
143 {
144 writer.writeText(name+"["+i+"]="+getValueString(obj)+";",null);
145 }
146
147 private void startArray(ResponseWriter writer, String name)
148 throws IOException
149 {
150 writer.writeText("var " + name+"=new Array();",null);
151 }
152
153 private String getValueString(Object value) throws IOException
154 {
155 if(value instanceof String )
156 {
157 return "'"+value+"'";
158 }
159 else if(value instanceof Number )
160 {
161 return value.toString();
162 }
163 else if(value instanceof Boolean )
164 {
165 return value.toString();
166 }
167 else if(value == null)
168 {
169 return "null";
170 }
171 else
172 {
173 throw new IOException ("value : "+value+" is of type : "+value.getClass()+
174 ", provide a method to convert this.");
175 }
176 }
177
178 protected Application getApplication()
179 {
180 return getFacesContext().getApplication();
181 }
182
183 protected FacesContext getFacesContext()
184 {
185 return FacesContext.getCurrentInstance();
186 }
187
188 }
189 |
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