Hi all,
I'm having a problem with Jelly and generics :)
I wrote a little tool to parse Javadocs and annotations on Java sources. I
use this tool in conjunction with Jelly for the
auto generation of files starting from Java code (a simplified version of
XDoclet if you want). I'm not using this
tool to generate Java interfaces starting from Java classes. Look at the
following class (written just for unit testing):
[code]
package uk.co.jemos.clanker.test.dummyclasses.classes;
import java.util.ArrayList;
/**
* @jemos-generics
* @author mtedone
*
*/
public class GenericsTestClass {
public ArrayList<String> getStrings() {
return new ArrayList<String>();
}
}
[/code]
I encapsulate all methods information in a 'Method' JavaBean, which has got
a getMethodSignature() which returns
the method signature as a String. In the above scenario, the generated
interfaces is as follows:
[list]
//Auto-generated by Jemos Clanker. Do not edit
package uk.co.jemos.mbean.ins;
/**
* Defines interface for class uk.co.jemos.mbean.ins.Hello
*/
public interface HelloMBean {
public ArrayList<String> getHellos();
}
[/list]
I then surfed the net and found a suggestion about the above problem which
consisted in using the commons-lang class StringEscapeUtils
(http://jakarta.apache.org/commons/lang/api/org/apache/commons/lang/StringEscapeUtils.html)
I then created a new method which returned a version for XML, by adding the
following at the end of my method (instead of returning the plain string):
return StringEscapeUtils.escapeXml(myString).
Now, whereas my Method JavaBean returns the following string:
[list]
public ArrayList<String> getStrings();
[/list]
which is the correct escaping for XML, my interface is written as follows:
[list]
//Auto-generated by Jemos Clanker. Do not edit
package uk.co.jemos.mbean.ins;
/**
* Defines interface for class uk.co.jemos.mbean.ins.Hello
*/
public interface HelloMBean {
public ArrayList&lt;String&gt; getHellos();
}
[/list]
instead of printing out the <> correctly, it added an & string to the
escaped characters.
This is my jelly script:
[list]
<?xml version="1.0"?>
<j:jelly trim="false"
xmlns:j="jelly:core"
xmlns:x="jelly:xml"
xmlns:html="jelly:html">
//Auto-generated by Jemos Clanker. Do not edit
package ${packageName};
/**
* Defines interface for class ${clazz.fullName}
*/
public interface ${clazz.name}${suffix} {
<j:forEach items="${clazz.methods}" var="method">
<j:if test="${method.hasJavadocTag('@jemos.mbean-method')}">
${method.methodSignatureForXml}
</j:if>
</j:forEach>
}
</j:jelly>
[/list]
This script is invoked by a Jelly Tag class which I wrote especially to
generate interfaces:
[list]
private void generateInterfaces(String outDir) throws FormatterException {
//A logging buffer
StringBuffer buff = new StringBuffer();
//The Java interface name
StringBuffer fileName = null;
//The Output Stream
OutputStream os = null;
//The jelly context
JellyContext context = new JellyContext();
//Sets the variables common to all
context.setVariable("suffix", this.getSuffix());
context.setVariable("packageName", this.getPackageName());
//For each class, it sets the context variables and runs the
//jelly script which contains the interfaces skeleton
for (Clazz c: this.getClasses()) {
fileName = new StringBuffer(outDir);
if (!outDir.endsWith("/")) {
fileName.append(File.separatorChar);
}
fileName.append(c.getName())
.append(this.getSuffix())
.append(".java");
LOG.info("Creating: " + fileName.toString());
try {
os = new FileOutputStream(new File(fileName.toString()));
//Sets the context variables for each class
context.setVariable("clazz", c);
//It then invokes the interface jelly skeleton
//which will generate the interface.
XMLOutput output = XMLOutput.createXMLOutput(os);
context.runScript(new File(this.getJellyScript()), output);
} catch (FileNotFoundException e) {
buff.append("An error occurred while trying to create")
.append(" the file output stream. The following file name: ")
.append(fileName)
.append(" wasn't found.");
LOG.severe(buff.toString());
throw new FormatterException(buff.toString(), e);
} catch (UnsupportedEncodingException e) {
buff.append("An error occurred while creating the XMLOutput")
.append(" object to write the Java interface to. This")
.append(" is the exception thrown by the application:")
.append("\n")
.append(e.getLocalizedMessage());
LOG.severe(buff.toString());
throw new FormatterException(buff.toString(), e);
} catch (JellyException e) {
buff.append("An error occurred while running the jelly script:
")
.append(this.getJellyScript())
.append(".");
LOG.severe(buff.toString());
throw new FormatterException(buff.toString(), e);
}
}
}
[/list]
Any help on how to solve this problem would be greatly appreciated.
Regards,
Marco
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