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16 package com.ibatis.sqlmap.engine.exchange;
17
18 import com.ibatis.common.exception.NestedRuntimeException;
19 import com.ibatis.common.resources.Resources;
20 import com.ibatis.sqlmap.engine.accessplan.AccessPlan;
21 import com.ibatis.sqlmap.engine.accessplan.AccessPlanFactory;
22 import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMap;
23 import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMapping;
24 import com.ibatis.sqlmap.engine.mapping.result.ResultMap;
25 import com.ibatis.sqlmap.engine.mapping.result.ResultMapping;
26 import com.ibatis.sqlmap.engine.scope.ErrorContext;
27 import com.ibatis.sqlmap.engine.scope.RequestScope;
28
29 import java.util.ArrayList  ;
30 import java.util.List ;
31 import java.util.Map ;
32
33
36 public class JavaBeanDataExchange extends BaseDataExchange implements DataExchange {
37
38 private static final Object [] NO_DATA = new Object [0];
39
40 private AccessPlan resultPlan;
41 private AccessPlan parameterPlan;
42 private AccessPlan outParamPlan;
43
44 protected JavaBeanDataExchange(DataExchangeFactory dataExchangeFactory) {
45 super(dataExchangeFactory);
46 }
47
48
53 public void initialize(Map properties) {
54 Object map = properties.get("map");
55 if (map instanceof ParameterMap) {
56 ParameterMap parameterMap = (ParameterMap) map;
57 if (parameterMap != null) {
58 ParameterMapping[] parameterMappings = parameterMap.getParameterMappings();
59 String [] parameterPropNames = new String [parameterMappings.length];
60 for (int i = 0; i < parameterPropNames.length; i++) {
61 parameterPropNames[i] = parameterMappings[i].getPropertyName();
62 }
63 parameterPlan = AccessPlanFactory.getAccessPlan(parameterMap.getParameterClass(), parameterPropNames);
64
65 List outParamList = new ArrayList ();
67 for (int i = 0; i < parameterPropNames.length; i++) {
68 if (parameterMappings[i].isOutputAllowed()) {
69 outParamList.add(parameterMappings[i].getPropertyName());
70 }
71 }
72 String [] outParams = (String []) outParamList.toArray(new String [outParamList.size()]);
73 outParamPlan = AccessPlanFactory.getAccessPlan(parameterMap.getParameterClass(), outParams);
74 }
75
76 } else if (map instanceof ResultMap) {
77 ResultMap resultMap = (ResultMap) map;
78 if (resultMap != null) {
79 ResultMapping[] resultMappings = resultMap.getResultMappings();
80 String [] resultPropNames = new String [resultMappings.length];
81 for (int i = 0; i < resultPropNames.length; i++) {
82 resultPropNames[i] = resultMappings[i].getPropertyName();
83 }
84 resultPlan = AccessPlanFactory.getAccessPlan(resultMap.getResultClass(), resultPropNames);
85 }
86 }
87 }
88
89 public Object [] getData(RequestScope request, ParameterMap parameterMap, Object parameterObject) {
90 if (parameterPlan != null) {
91 return parameterPlan.getProperties(parameterObject);
92 } else {
93 return NO_DATA;
94 }
95 }
96
97 public Object setData(RequestScope request, ResultMap resultMap, Object resultObject, Object [] values) {
98 if (resultPlan != null) {
99 Object object = resultObject;
100
101 ErrorContext errorContext = request.getErrorContext();
102
103 if (object == null) {
104 errorContext.setMoreInfo("The error occured while instantiating the result object");
105 try {
106 object = Resources.instantiate(resultMap.getResultClass());
107 } catch (Exception e) {
108 throw new NestedRuntimeException("JavaBeansDataExchange could not instantiate result class. Cause: " + e, e);
109 }
110 }
111 errorContext.setMoreInfo("The error happened while setting a property on the result object.");
112 resultPlan.setProperties(object, values);
113 return object;
114 } else {
115 return null;
116 }
117 }
118
119 public Object setData(RequestScope request, ParameterMap parameterMap, Object parameterObject, Object [] values) {
121 if (outParamPlan != null) {
122 Object object = parameterObject;
123 if (object == null) {
124 try {
125 object = Resources.instantiate(parameterMap.getParameterClass());
126 } catch (Exception e) {
127 throw new NestedRuntimeException("JavaBeansDataExchange could not instantiate parameter class. Cause: " + e, e);
128 }
129 }
130 values = getOutputParamValues(parameterMap.getParameterMappings(), values);
131 outParamPlan.setProperties(object, values);
132 return object;
133 } else {
134 return null;
135 }
136 }
137
138 private Object [] getOutputParamValues(ParameterMapping[] mappings, Object [] values) {
139 List outParamValues = new ArrayList ();
140 for (int i = 0; i < mappings.length; i++) {
141 if (mappings[i].isOutputAllowed()) {
142 outParamValues.add(values[i]);
143 }
144 }
145 return outParamValues.toArray();
146 }
147
148 }
149 |
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