|
1 package org.sapia.soto.state.control;
2
3 import org.apache.commons.jexl.Expression;
4 import org.apache.commons.jexl.ExpressionFactory;
5 import org.apache.commons.lang.ClassUtils;
6 import org.apache.commons.lang.StringUtils;
7
8 import org.sapia.soto.state.Result;
9 import org.sapia.soto.state.ScopeMap;
10 import org.sapia.soto.state.Step;
11 import org.sapia.soto.state.helpers.CompositeStep;
12
13 import java.util.ArrayList  ;
14 import java.util.List ;
15 import java.util.Map ;
16
17
18
26 public class Choose implements Step {
27 private List _cases = new ArrayList ();
28 private Otherwise _other;
29
30
33 public Choose() {
34 }
35
36
39 public String getName() {
40 return ClassUtils.getShortClassName(getClass());
41 }
42
43 public When createWhen() {
44 When caseObj = new When();
45 _cases.add(caseObj);
46
47 return caseObj;
48 }
49
50 public Otherwise createOtherwise() {
51 return _other = new Otherwise();
52 }
53
54
57 public void execute(Result st) {
58 When caseObj;
59
60 for (int i = 0; i < _cases.size(); i++) {
61 caseObj = (When) _cases.get(i);
62
63 if (caseObj.isTrue(st)) {
64 caseObj.execute(st);
65
66 return;
67 }
68 }
69
70 if (_other != null) {
71 _other.execute(st);
72 }
73 }
74
75 public static class Otherwise extends CompositeStep {
77
80 public String getName() {
81 return ClassUtils.getShortClassName(getClass());
82 }
83
84
87 protected boolean doExecute(Result st) {
88 return true;
89 }
90 }
91
92 public class When extends CompositeStep {
93 private Expression _expr;
94 private String [] _scopes;
95
96 public When() {
97 }
98
99
102 public String getName() {
103 return ClassUtils.getShortClassName(getClass());
104 }
105
106 public boolean isTrue(Result st) {
107 Map scopes = st.getContext().getScopes();
108 ScopeMap map = new ScopeMap(scopes, _scopes);
109 Object evaled = null;
110
111 try {
112 evaled = _expr.evaluate(map);
113
114 Boolean b = (Boolean ) evaled;
115
116 return b.booleanValue();
117 } catch (ClassCastException e) {
118 st.error("'case' must evaluate to a Boolean, not a " + evaled);
119
120 return false;
121 } catch (Exception e) {
122 e.printStackTrace();
123 st.error("Could not evaluate: '" + _expr.getExpression() + "' - " +
124 e.getMessage());
125
126 return false;
127 }
128 }
129
130 public void setTest(String expr) throws Exception {
131 _expr = ExpressionFactory.createExpression(expr);
132 }
133
134 public void setScopes(String scopes) {
135 _scopes = StringUtils.split(scopes, ",");
136
137 for (int i = 0; i < _scopes.length; i++) {
138 _scopes[i] = _scopes[i].trim();
139 }
140 }
141
142
145 protected boolean doExecute(Result st) {
146 return true;
147 }
148 }
149 }
150 |
Popular Tags |
Java API By Example, From Geeks To Geeks.