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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
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package org.scijava.module;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.scijava.Validated;
import org.scijava.ValidityProblem;
/**
* A reference to a {@link Method}, which can be invoked at will.
*
* @author Curtis Rueden
*/
public class MethodRef implements Validated {
private final Method method;
private final String label;
/** List of problems when initializing the method reference. */
private final List problems =
new ArrayList<>();
public MethodRef(final Class clazz, final String methodName,
final Class... params)
{
method = findMethod(clazz, methodName, params);
if (method == null) label = null;
else label = clazz.getName() + "#" + method.getName();
}
public void execute(final Object obj, final Object... args)
throws MethodCallException
{
if (method == null) return;
try {
method.invoke(obj, args);
}
catch (final Exception exc) {
// NB: Several types of exceptions; simpler to handle them all the same.
throw new MethodCallException("Error executing method: " + label, exc);
}
}
private Method findMethod(final Class clazz, final String methodName,
final Class... params)
{
if (clazz == null) return null;
if (methodName == null || methodName.isEmpty()) return null;
for (Class c = clazz; c != null; c = c.getSuperclass()) {
try {
final Method m = c.getDeclaredMethod(methodName, params);
m.setAccessible(true);
return m;
}
catch (final NoSuchMethodException e) {
// NB: Continue to loop into super class methods.
}
catch (final Exception e) {
// NB: Multiple types of exceptions; handle them all the same.
break;
}
}
final String problem =
"Method not found: " + clazz.getName() + "#" + methodName;
problems.add(new ValidityProblem(problem));
return null;
}
// -- Validated methods --
@Override
public boolean isValid() {
return problems.isEmpty();
}
@Override
public List getProblems() {
return Collections.unmodifiableList(problems);
}
}