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1 package org.jbpm.context.exe;
2
3 import java.io.Serializable  ;
4 import java.util.Iterator ;
5
6 import org.jbpm.db.JbpmSession;
7 import org.jbpm.graph.exe.ProcessInstance;
8 import org.jbpm.graph.exe.Token;
9
10
14 public abstract class VariableInstance implements Serializable {
15
16 private static final long serialVersionUID = 1L;
17
18 long id = 0;
19 protected String name = null;
20 protected Token token = null;
21 protected TokenVariableMap tokenVariableMap = null;
22 protected ProcessInstance processInstance = null;
23 protected Converter converter = null;
24
25
27 public VariableInstance() {
28 }
29
30 public static VariableInstance create(TokenVariableMap tokenVariableMap, String name, Class valueClass) {
32 Token token = tokenVariableMap.token;
33 ProcessInstance processInstance = (token!=null ? token.getProcessInstance() : null );
34 VariableInstance variableInstance = createVariableInstance(valueClass);
35 variableInstance.tokenVariableMap = tokenVariableMap;
36 variableInstance.token = token;
37 variableInstance.processInstance = processInstance;
38 variableInstance.name = name;
39 return variableInstance;
40 }
41
42
44
47 protected abstract boolean supports(Class clazz);
48
51 protected abstract Object getObject();
52
55 protected abstract void setObject(Object value);
56
57
59 public static VariableInstance createVariableInstance(Class javaType) {
60 VariableInstance variableInstance = null;
61
62 Iterator iter = JbpmType.getJbpmTypes().iterator();
63 while ( (iter.hasNext())
64 && (variableInstance==null) ){
65 JbpmType jbpmType = (JbpmType) iter.next();
66
67 boolean isMatch = false;
69 if ( (jbpmType.variableClass!=null)
70 && (jbpmType.variableClass.isAssignableFrom(javaType)) ) {
71 isMatch = true;
72 } else {
73 if (javaType.getName().equals(jbpmType.variableClassName)) {
74 isMatch = true;
75 } else if ("{serializable-classes}".equals(jbpmType.variableClassName)) {
76 isMatch = (Serializable .class.isAssignableFrom(javaType));
77 } else if ("{hibernateable-long-id-classes}".equals(jbpmType.variableClassName)) {
78 JbpmSession currentJbpmSession = JbpmSession.getCurrentJbpmSession();
79 isMatch = ( (currentJbpmSession!=null)
80 && (currentJbpmSession.getJbpmSessionFactory().isHibernatableWithLongId(javaType)));
81 } else if ("{hibernateable-string-id-classes}".equals(jbpmType.variableClassName)) {
82 JbpmSession currentJbpmSession = JbpmSession.getCurrentJbpmSession();
83 isMatch = ( (currentJbpmSession!=null)
84 && (currentJbpmSession.getJbpmSessionFactory().isHibernatableWithStringId(javaType)));
85 }
86 }
87
88 if (isMatch) {
89 variableInstance = createVariableInstance(jbpmType);
90 }
91 }
92
93 if (variableInstance==null) {
94 throw new RuntimeException ("contents of jbpm.varmapping.properties does not specify how jbpm should store objects of type '"+javaType.getName()+"' in the database");
95 }
96
97 return variableInstance;
98 }
99
100 private static VariableInstance createVariableInstance(JbpmType jbpmType) {
101 VariableInstance variableInstance;
102 try {
103 variableInstance = (VariableInstance) jbpmType.variableInstanceClass.newInstance();
104 variableInstance.converter = jbpmType.converter;
105 } catch (Exception e) {
106 throw new RuntimeException ("couldn't instantiate variable instance of class '"+jbpmType.getClass().getName()+"'", e);
107 }
108 return variableInstance;
109 }
110
111 public void setValue(Object value) {
112 if ( (value!=null)
113 && (converter!=null) ) {
114 if (! converter.supports(value.getClass())) {
115 throw new RuntimeException ("the converter '"+converter.getClass().getName()+"' in variable instance '"+this.getClass().getName()+"' does not support values of type '"+value.getClass().getName()+"'. to change the type of a variable, you have to delete it first");
116 }
117 value = converter.convert(value);
118 }
119 if ( (value!=null)
120 && (! this.supports(value.getClass())) ) {
121 throw new RuntimeException ("variable instance '"+this.getClass().getName()+"' does not support values of type '"+value.getClass().getName()+"'. to change the type of a variable, you have to delete it first");
122 }
123 setObject(value);
124 }
125
126 public Object getValue() {
127 Object value = getObject();
128 if ( (value!=null)
129 && (converter!=null) ) {
130 value = converter.revert(value);
131 }
132 return value;
133 }
134
135
136 public void removeTokenVariableMapReference() {
137 this.tokenVariableMap = null;
138 this.token = null;
139 this.processInstance = null;
140 }
141
142
143
145 public String toString() {
146 return "${"+name+"}";
147 }
148
149
151 public String getName() {
152 return name;
153 }
154
155 public ProcessInstance getProcessInstance() {
156 return processInstance;
157 }
158
159 public Token getToken() {
160 return token;
161 }
162 }
163 |
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