|
1 package org.ajaxanywhere.jsf;
2
3 import org.ajaxanywhere.AAUtils;
4
5 import javax.faces.component.UIComponent;
6 import javax.faces.component.UIComponentBase;
7 import javax.faces.component.UIViewRoot;
8 import javax.faces.context.FacesContext;
9 import javax.faces.context.ResponseWriter;
10 import javax.faces.el.ValueBinding;
11 import java.io.IOException  ;
12 import java.util.Iterator ;
13 import java.util.Map ;
14
15
16 public class ZoneUIComponent extends UIComponentBase {
17 private static final String COMPONENT_FAMILY = "AjaxAnywhereFamily";
18
19 public ZoneUIComponent() {
20 setTransient(false);
21 }
22
23 public String getFamily() {
24 return COMPONENT_FAMILY;
25 }
26
27 public void encodeBegin(FacesContext context)
28 throws IOException {
29 if (context == null) throw new IllegalArgumentException ("context is null");
30 if (!isRendered()) return;
31 if (getId() == null)
32 throw new IllegalArgumentException ("name attribute is null");
33
34 if (canSkipRendering(this, context))
35 return;
36
37 ResponseWriter writer = context.getResponseWriter();
38 writer.write(AAUtils.getZoneStartDelimiter(getCompositeId()));
39
40 }
41
42 private String getCompositeId() {
43 ValueBinding vb = getValueBinding("idSuffix");
44 String compId = vb == null ? getId() : getId()+vb.getValue(getFacesContext());
45 return compId;
46 }
47
48 public boolean getRendersChildren() {
49 return true;
50 }
51
52 public void encodeChildren(FacesContext context)
53 throws IOException {
54 if (context == null) throw new IllegalArgumentException ("context is null");
55 if (canSkipRendering(this, context))
56 return;
57
58 renderChildren(context, this);
59 }
60
61 public void encodeEnd(FacesContext context)
62 throws IOException {
63 if (context == null) throw new IllegalArgumentException ("context is null");
64 if (!isRendered()) return;
65 if (canSkipRendering(this, context))
66 return;
67
68 ResponseWriter writer = context.getResponseWriter();
69 writer.write(AAUtils.getZoneEndDelimiter(getCompositeId()));
70 }
71
72
73 private static void renderChildren(FacesContext facesContext, UIComponent component)
74 throws IOException {
75 if (component.getChildCount() > 0) {
76 for (Iterator it = component.getChildren().iterator(); it.hasNext();) {
77 UIComponent child = (UIComponent) it.next();
78 renderComponent(facesContext, child);
79 }
80 }
81 }
82
83
84 private static void renderComponent(FacesContext facesContext, UIComponent child)
85 throws IOException {
86
87 if (!child.isRendered()) {
88 return;
89 }
90
91 child.encodeBegin(facesContext);
92 if (child.getRendersChildren()) {
93 child.encodeChildren(facesContext);
94 } else {
95 renderChildren(facesContext, child);
96 }
97 child.encodeEnd(facesContext);
98 }
99
100 private static boolean canSkipRendering(UIComponent component, FacesContext context) {
101 return noIncludedSubZones(component, context) && notInsideIncludedZone(component, context);
102 }
103
106 private static boolean notInsideIncludedZone(UIComponent component, FacesContext context) {
107 Map requestMap = context.getExternalContext().getRequestMap();
108 UIComponent parent = component.getParent();
109 while (parent != null && ! (parent instanceof UIViewRoot)) {
110 if (isRefreshZone(parent, requestMap))
111 return false;
112 parent = parent.getParent();
113 }
114 return true;
115 }
116
117
120 private static boolean noIncludedSubZones(UIComponent component, FacesContext context) {
121 Map requestMap = context.getExternalContext().getRequestMap();
122 Map requestParameterMap = context.getExternalContext().getRequestParameterMap();
123 if (! AAUtils.isAjaxRequest(requestParameterMap) )
124 return false;
125 if (isRefreshZone(component, requestMap))
126 return false;
127 else {
128 for (Iterator iterator = component.getChildren().iterator(); iterator.hasNext();) {
129 UIComponent child = (UIComponent) iterator.next();
130 if (!canSkipRendering(child, context))
131 return false;
132 }
133 return true;
134 }
135 }
136
137 private static boolean isRefreshZone(UIComponent component, Map requestMap)
138 {
139 if (component instanceof ZoneUIComponent==false)
140 return false;
141
142 ZoneUIComponent c = (ZoneUIComponent)component;
143 for (Iterator it = AAUtils.getZonesToRefresh(requestMap).iterator();it.hasNext();)
144 {
145 String zoneName = (String )it.next();
146 if (c.getValueBinding("idSuffix")!=null)
147 {
148 if (zoneName.startsWith(c.getId()))
149 return true;
150 }
151 else
152 {
153 if (zoneName.equals(c.getId()))
154 return true;
155 }
156 }
157 return false;
158 }
159 }
160 |
Popular Tags |
Java API By Example, From Geeks To Geeks.