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1
37 package net.sourceforge.cruisecontrol.util;
38
39 import net.sourceforge.cruisecontrol.CruiseControlException;
40 import org.apache.log4j.Logger;
41 import org.jdom.Document;
42 import org.jdom.Element;
43 import org.jdom.JDOMException;
44 import org.jdom.input.SAXBuilder;
45 import org.jdom.xpath.XPath;
46
47 import java.io.File  ;
48 import java.io.FileInputStream ;
49 import java.io.IOException ;
50 import java.io.InputStream ;
51
52
76 public class XPathAwareChild {
77
78 private static final Logger LOG = Logger.getLogger(XPathAwareChild.class);
79
80 private String value;
81 private String xpathExpression;
82 private InputStream in;
83 private String xmlFile;
84 private boolean wasValidated;
85
86
91 public void setValue(String value) {
92 markDirty();
93 this.value = value;
94 }
95
96 public void setXPathExpression(String xpathExpression) {
97 markDirty();
98 this.xpathExpression = xpathExpression;
99 }
100
101
106 public void setInputStream(InputStream in) {
107 markDirty();
108 this.in = in;
109 }
110
111 public void setXMLFile(String filename) {
112 markDirty();
113 xmlFile = filename;
114 }
115
116 public String getFixedValue() {
117 return value;
118 }
119
120 public String getXpathExpression() {
121 return xpathExpression;
122 }
123
124
128 public String lookupValue(Element log) throws CruiseControlException {
129 if (!wasValidated) {
130 throw new IllegalStateException (
131 "This child was not validated."
132 + " Should not be calling lookupValue() unless it has first been validated.");
133 }
134
135 if (value != null) {
136 return value;
137 } else {
138 try {
139 return evaluateXpath(log);
140 } catch (Exception e) {
141 throw new CruiseControlException(e);
142 }
143 }
144 }
145
146 private String evaluateXpath(Element log) throws IOException , JDOMException, CruiseControlException {
147
148 Object searchContext;
149 if (in == null && xmlFile == null && log == null) {
150 throw new CruiseControlException("current cruisecontrol log not set.");
151 } else if (xmlFile != null) {
152 LOG.debug("Using file specified [" + xmlFile + "] to evaluate xpath.");
153 searchContext = new SAXBuilder().build(new FileInputStream (new File (xmlFile)));
154 } else if (in != null) {
155 LOG.debug("Using the specified input stream to evaluate xpath. This should happen during testing.");
156 searchContext = new SAXBuilder().build(in);
157 } else {
158 LOG.debug("Using CruiseControl's log file to evaluate xpath.");
159 if (log.getParent() != null) {
160 searchContext = log.getParent();
161 } else {
162 searchContext = new Document(log);
163 }
164 }
165
166 XPath xpath = XPath.newInstance(xpathExpression);
167 String result = xpath.valueOf(searchContext);
168 LOG.debug("Evaluated xpath [" + xpathExpression + "] with result [" + result + "]");
169 return result;
170 }
171
172
177 public void validate() throws CruiseControlException {
178 if (xpathExpression == null && xmlFile != null) {
179 throw new CruiseControlException("xmlFile should only be set if xpathExpression is also set.");
180 }
181
182 if (value == null && xpathExpression == null) {
183 throw new CruiseControlException("Either value or xpathExpression must be set.");
184 }
185 if (value != null && xpathExpression != null) {
186 throw new CruiseControlException("value and xpathExpression should not both be set.");
187 }
188
189
190 markClean();
191 }
192
193 private void markClean() {
194 wasValidated = true;
195 }
196
197
200 protected void markDirty() {
201 wasValidated = false;
202 }
203
204
205 }
206 |
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