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18 package org.apache.commons.scxml.env.faces;
19
20 import java.util.Map;
21
22 import javax.faces.context.FacesContext;
23
24 import org.apache.commons.scxml.Context;
25 import org.apache.commons.scxml.env.SimpleContext;
26
27 /***
28 * <p>A Faces Session Context.</p>
29 *
30 * <p>Since the "session map" is obtained from a
31 * <code>FacesContext</code> object using the environment agnostic
32 * <code>getExternalContext()</code>, this <code>Context</code>
33 * will be useful in Servlet as well as Portlet environments.</p>
34 *
35 */
36 public class SessionContext extends SimpleContext {
37
38 /*** The map of session scoped variables. */
39 private Map sessionMap;
40 /*** Bark if FacesContext is null. */
41 private static final String ERR_HOST_FACES_CTX_NULL =
42 "Host FacesContext cannot be null";
43
44 /***
45 * Constructor.
46 *
47 * @param fc The current FacesContext
48 */
49 public SessionContext(final FacesContext fc) {
50 this(fc, null);
51 }
52
53 /***
54 * Constructor.
55 *
56 * @param fc The current FacesContext
57 * @param parent A parent Context, can be null
58 */
59 public SessionContext(final FacesContext fc, final Context parent) {
60 super(parent);
61 if (fc == null) {
62 throw new IllegalArgumentException(ERR_HOST_FACES_CTX_NULL);
63 } else {
64
65 this.sessionMap = fc.getExternalContext().getSessionMap();
66 }
67
68 }
69
70 /***
71 * Get the value of the given variable in this Context.
72 *
73 * @param name The name of the variable
74 * @return The value (or null)
75 * @see org.apache.commons.scxml.Context#get(java.lang.String)
76 */
77 public Object get(final String name) {
78 Object value = getVars().get(name);
79 if (value == null) {
80 value = sessionMap.get(name);
81 }
82 return value;
83 }
84
85 /***
86 * Does the given variable exist in this Context.
87 *
88 * @param name The name of the variable
89 * @return boolean true if the variable exists
90 * @see org.apache.commons.scxml.Context#has(java.lang.String)
91 */
92 public boolean has(final String name) {
93 return (sessionMap.containsKey(name) || getVars().containsKey(name));
94 }
95
96 }
97