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MethodRef.java
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114 lines (101 loc) · 3.62 KB
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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2016 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
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<ValidityProblem> 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<ValidityProblem> getProblems() {
return Collections.unmodifiableList(problems);
}
}