|
1
22
23
24 package com.mchange.v2.codegen.bean;
25
26 import java.util.*;
27 import java.lang.reflect.Modifier  ;
28 import java.io.IOException ;
29 import com.mchange.v2.codegen.CodegenUtils;
30 import com.mchange.v2.codegen.IndentedWriter;
31
32 public class BeanExtractingGeneratorExtension implements GeneratorExtension
33 {
34 int ctor_modifiers = Modifier.PUBLIC;
35 int method_modifiers = Modifier.PRIVATE;
36
37 public void setConstructorModifiers( int ctor_modifiers )
38 { this.ctor_modifiers = ctor_modifiers; }
39
40 public int getConstructorModifiers()
41 { return ctor_modifiers; }
42
43 public void setExtractMethodModifiers( int ctor_modifiers )
44 { this.method_modifiers = method_modifiers; }
45
46 public int getExtractMethodModifiers()
47 { return method_modifiers; }
48
49 public Collection extraGeneralImports()
50 { return Collections.EMPTY_SET; }
51
52 public Collection extraSpecificImports()
53 {
54 Set set = new HashSet();
55 set.add("java.beans.BeanInfo");
56 set.add("java.beans.PropertyDescriptor");
57 set.add("java.beans.Introspector");
58 set.add("java.beans.IntrospectionException");
59 set.add("java.lang.reflect.InvocationTargetException");
60 return set;
61 }
62
63 public Collection extraInterfaceNames()
64 { return Collections.EMPTY_SET; }
65
66 public void generate(ClassInfo info, Class superclassType, Property[] props, Class [] propTypes, IndentedWriter iw)
67 throws IOException
68 {
69 iw.println("private static Class[] NOARGS = new Class[0];");
70 iw.println();
71 iw.print( CodegenUtils.getModifierString( method_modifiers ) );
72 iw.print(" void extractPropertiesFromBean( Object bean ) throws InvocationTargetException, IllegalAccessException, IntrospectionException");
73 iw.println("{");
74 iw.upIndent();
75
76 iw.println("BeanInfo bi = Introspector.getBeanInfo( bean.getClass() );");
77 iw.println("PropertyDescriptor[] pds = bi.getPropertyDescriptors();");
78 iw.println("for (int i = 0, len = pds.length; i < len; ++i)");
79 iw.println("{");
80 iw.upIndent();
81
82 for (int i = 0, len = props.length; i < len; ++i)
83 {
84 iw.println("if (\"" + props[i].getName() + "\".equals( pds[i].getName() ) )");
85 iw.upIndent();
86 iw.println("this." + props[i].getName() + " = " + extractorExpr( props[i], propTypes[i] ) + ';');
87 iw.downIndent();
88 }
89 iw.println("}");
91
92 iw.downIndent();
93 iw.println("}"); iw.println();
95 iw.print( CodegenUtils.getModifierString( ctor_modifiers ) );
96 iw.println(' ' + info.getClassName() + "( Object bean ) throws InvocationTargetException, IllegalAccessException, IntrospectionException");
97 iw.println("{");
98 iw.upIndent();
99 iw.println("extractPropertiesFromBean( bean );");
100 iw.downIndent();
101 iw.println("}");
102 }
103
104 private String extractorExpr( Property prop, Class propType )
105 {
106 if ( propType.isPrimitive() )
107 {
108 String castType = BeangenUtils.capitalize( prop.getSimpleTypeName() );
109 String valueMethod = prop.getSimpleTypeName() + "Value()";
110
111 if ( propType == char.class)
112 castType = "Character";
113 else if ( propType == int.class)
114 castType = "Integer";
115
116 return "((" + castType + ") pds[i].getReadMethod().invoke( bean, NOARGS ))." + valueMethod;
117 }
118 else
119 return "(" + prop.getSimpleTypeName() + ") pds[i].getReadMethod().invoke( bean, NOARGS )";
120 }
121 }
122 |
Popular Tags |
Java API By Example, From Geeks To Geeks.