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1
16 package scriptella.configuration;
17
18 import scriptella.core.SystemException;
19
20 import java.lang.reflect.Method  ;
21 import java.util.ArrayList ;
22 import java.util.List ;
23 import java.util.regex.Pattern ;
24
25
26
29 public abstract class XmlConfigurableBase implements XmlConfigurable {
30 private Location location;
31
32 protected void setRequiredProperty(final XmlElement element,
33 final String attribute, final String property) {
34 setProperty(element, attribute, property);
35 assertRequiredFieldPresent(element, attribute, property);
36 }
37
38
41 protected void setProperty(final XmlElement element, final String attribute) {
42 setProperty(element, attribute, attribute);
43 }
44
45
52 protected void setProperty(final XmlElement element,
53 final String attribute, final String property) {
54 String attributeValue = element.getAttribute(attribute);
55
56 try {
57 final Method method = findSetter(property);
58 method.invoke(this, attributeValue);
59 } catch (Exception e) {
60 throw new ConfigurationException("Unable to set property " +
61 property + " from attribute " + attribute, e, element);
62 }
63 }
64
65
68 protected void setPatternProperty(final XmlElement element, final String property) {
69 setPatternProperty(element, property, property);
70 }
71
72
79 protected void setPatternProperty(final XmlElement element,
80 final String attribute, final String property) {
81 String ptrStr = element.getAttribute(attribute);
82 Pattern ptr = null;
83 if (ptrStr != null) {
84 try {
85 ptr = Pattern.compile(ptrStr, Pattern.CASE_INSENSITIVE + Pattern.DOTALL);
87 } catch (Exception e) {
88 throw new ConfigurationException("Attribute " + attribute + " requires valid regular expression, but was: " +
89 ptrStr, e, element);
90 }
91 }
92 try {
93 final Method method = getClass().getMethod(
94 "set" + Character.toUpperCase(property.charAt(0)) + property.substring(1), Pattern .class);
95 method.invoke(this, ptr);
96 } catch (Exception e) {
97 throw new ConfigurationException("Unable to set property " +
98 property + " from attribute " + attribute, e, element);
99 }
100
101
102 }
103
104 protected Method findSetter(final String property)
105 throws NoSuchMethodException {
106 return getClass()
107 .getMethod("set" +
108 Character.toUpperCase(property.charAt(0)) + property.substring(1),
109 String .class);
110 }
111
112 protected Method findGetter(final String property)
113 throws NoSuchMethodException {
114 return getClass()
115 .getMethod("get" + Character.toUpperCase(property.charAt(0)) + property.substring(1));
116 }
117
118 protected void setRequiredProperty(final XmlElement element,
119 final String attribute) {
120 setRequiredProperty(element, attribute, attribute);
121 }
122
123 protected <T> T loadClass(final XmlElement element, final String attribute,
124 final Class <T> spec) {
125 final String h = element.getAttribute(attribute);
126
127 if (h == null) {
128 return null;
129 }
130
131 Class c = null;
132
133 try {
134 c = Class.forName(h);
135 } catch (ClassNotFoundException e) {
136 throw new scriptella.configuration.ConfigurationException(
137 "Invalid class " + h, e, element);
138 }
139
140 if (!spec.isAssignableFrom(c)) {
141 throw new scriptella.configuration.ConfigurationException("Class " +
142 c + " doesn't implement " + spec, element);
143 }
144
145 try {
146 return (T) c.newInstance();
147 } catch (Exception e) {
148 throw new scriptella.configuration.ConfigurationException(
149 "Unable to instantiate class " + c, element);
150 }
151 }
152
153 protected <T extends XmlConfigurable> List <T> load(
154 final List <XmlElement> elements, final Class <T> clazz) {
155 if (elements == null) {
156 return null;
157 }
158
159 List <T> l = new ArrayList <T>(elements.size());
160
161 for (XmlElement element : elements) {
162 try {
163 T t = clazz.newInstance();
164 t.configure(element);
165 l.add(t);
166 } catch (InstantiationException e) {
167 throw new SystemException(e);
168 } catch (IllegalAccessException e) {
169 throw new SystemException(e);
170 }
171 }
172
173 return l;
174 }
175
176 protected void assertRequiredFieldPresent(final XmlElement element,
177 final String attribute, final String property) {
178 try {
179 final Method getter = findGetter(property);
180
181 if (getter.invoke(this, (Object []) null) == null) {
182 throw new RequiredAttributeException(attribute, element);
183 }
184 } catch (ConfigurationException e) {
185 throw e;
186 } catch (Exception e) {
187 throw new RequiredAttributeException(attribute, e, element);
188 }
189 }
190
191 protected void assertRequiredFieldPresent(final XmlElement element,
192 final String property) {
193 assertRequiredFieldPresent(element, property, property);
194 }
195
196
201 protected void setLocation(XmlElement element) {
202 location = new Location(element.getXPath());
203 }
204
205 protected void setLocation(Location location) {
206 this.location = location;
207 }
208
209 protected Location getLocation() {
210 return location;
211 }
212 }
213 |
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