JarCastingwritejava4me Easy code generation for Java
Works as annotation for annotation. User defines new annotation and annotate it with @GeneratesClass annotation. @GeneratesClass defines wich class will be generated.
Example
Imagine that we would like to define both checked exception and RuntimeException when checked exception can't be used.
We can write it like this:
public class MyException extends Exception {
private final MyData valuableData;
public MyException(String message, MyData valuableData) {
super(message);
this.valuableData = valuableData;
}
public MyData valuableData() {
return valuableData;
}
}
public class RuntimeMyException extends RuntimeException {
private final MyException cause;
public RuntimeMyException(MyException cause) {
super(cause);
this.cause = cause;
}
@Override
public MyException getCause() {
return cause;
}
}
If we are going to define many exceptions pairs like this we may want to generate Runtime wrappers automatically. It will be good to have annotation for this.
@GenerateRuntimeExceptionWrapper
public class MyException extends Exception {
private final MyData valuableData;
public MyException(String message, MyData valuableData) {
super(message);
this.valuableData = valuableData;
}
public MyData valuableData() {
return valuableData;
}
}
With writejava4me it's easy to define such annotations. Here is an implementation for @GenerateRuntimeExceptionWrapper
GenerateRuntimeExceptionWrapper.java:
@Retention(RetentionPolicy.SOURCE)
@Target(ElementType.TYPE)
@Documented
@GeneratesClass(classNameTemplateString = "Runtime{{annotated}}", classTemplateResourcePath = "RuntimeExceptionWrapper.mustache")
@interface GenerateRuntimeExceptionWrapper {
}
RuntimeExceptionWrapper.mustache located in resources folder:
package {{package}};
public class {{class}} extends RuntimeException {
private final {{annotated}} cause;
public {{class}}({{annotated}} cause) {
super(cause);
this.cause = cause;
}
@Override
public {{annotated}} getCause() {
return cause;
}
}
See examples project for more examples
License
writejava4me is under BSD 3-clause license.
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Installation
Use maven dependency:
<dependency>
<groupId>com.github.sviperll</groupId>
<artifactId>writejava4me</artifactId>
<version>0.1</version>
</dependency>