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/*******************************************************************************
* Copyright (c) 2010 Markus Alexander Kuppe.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Markus Alexander Kuppe (ecf-dev_eclipse.org <at> lemmster <dot> de) - initial API and implementation
******************************************************************************/
package org.eclipse.ecf.core.util.reflection;
import java.lang.reflect.Method;
import java.util.*;
/**
* @since 3.3
*/
@SuppressWarnings("unchecked")
public class ClassUtil {
private static Map convertor = new HashMap();
static {
convertor.put(boolean.class, Boolean.class);
convertor.put(byte.class, Byte.class);
convertor.put(char.class, Character.class);
convertor.put(double.class, Double.class);
convertor.put(float.class, Float.class);
convertor.put(int.class, Integer.class);
convertor.put(long.class, Long.class);
convertor.put(short.class, Short.class);
}
/**
* @param aClass The Class providing method under question (Must not be null)
* @param aMethodName The method name to search for (Must not be null)
* @param someParameterTypes Method arguments (May be null or parameters)
* @return A match. If more than one method matched (due to overloading) an arbitrary match is taken
* @throws NoSuchMethodException If a match cannot be found
*/
public static Method getMethod(final Class aClass, String aMethodName, final Class[] someParameterTypes) throws NoSuchMethodException {
// no args makes matching simple
if (someParameterTypes == null || someParameterTypes.length == 0) {
return aClass.getMethod(aMethodName, (Class[]) null);
}
return getMethod(aClass.getMethods(), aMethodName, someParameterTypes);
}
/**
* @param aClass The Class providing method under question (Must not be null)
* @param aMethodName The method name to search for (Must not be null)
* @param someParameterTypes Method arguments (May be null or parameters)
* @return A match. If more than one method matched (due to overloading) an arbitrary match is taken
* @throws NoSuchMethodException If a match cannot be found
*/
public static Method getDeclaredMethod(final Class aClass, String aMethodName, final Class[] someParameterTypes) throws NoSuchMethodException {
// no args makes matching simple
if (someParameterTypes == null || someParameterTypes.length == 0) {
return aClass.getDeclaredMethod(aMethodName, (Class[]) null);
}
return getMethod(aClass.getDeclaredMethods(), aMethodName, someParameterTypes);
}
private static Method getMethod(final Method[] candidates, String aMethodName, final Class[] someParameterTypes) throws NoSuchMethodException {
// match parameters to determine callee
final int parameterCount = someParameterTypes.length;
aMethodName = aMethodName.intern();
final TreeSet matches = new TreeSet(new MethodComparator(someParameterTypes));
OUTER: for (int i = 0; i < candidates.length; i++) {
final Method candidate = candidates[i];
final String candidateMethodName = candidate.getName().intern();
final Class[] candidateParameterTypes = candidate.getParameterTypes();
final int candidateParameterCount = candidateParameterTypes.length;
if (candidateParameterCount == parameterCount && aMethodName == candidateMethodName) {
for (int j = 0; j < candidateParameterCount; j++) {
final Class clazzA = candidateParameterTypes[j];
final Class clazzB = someParameterTypes[j];
if (clazzB != null && !isAssignableFrom(clazzA, clazzB)) {
continue OUTER;
}
}
matches.add(candidate);
}
}
// if no match has been found, fail with NSME
if (matches.size() == 0) {
throw new NoSuchMethodException("No such method: " + aMethodName + "(" + Arrays.asList(someParameterTypes) + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
return (Method) matches.first();
}
// extends Class.isAssingable(Class) with autoboxing
private static boolean isAssignableFrom(Class clazzA, Class clazzB) {
if (!(clazzA.isPrimitive() ^ clazzB.isPrimitive())) {
return clazzA.isAssignableFrom(clazzB);
} else if (clazzA.isPrimitive()) {
final Class oClazzA = (Class) convertor.get(clazzA);
return oClazzA.isAssignableFrom(clazzB);
} else {
final Class oClazzB = (Class) convertor.get(clazzB);
return clazzA.isAssignableFrom(oClazzB);
}
}
private static class MethodComparator implements Comparator {
private final Class[] parameterTypes;
public MethodComparator(Class[] someParameterTypes) {
parameterTypes = someParameterTypes;
}
public int compare(Object object1, Object object2) {
final Class[] pt1 = ((Method) object1).getParameterTypes();
final Class[] pt2 = ((Method) object2).getParameterTypes();
if (Arrays.equals(pt1, pt2)) {
return 0;
} else if (Arrays.equals(parameterTypes, pt1)) {
return -1;
} else {
return 1;
}
}
}
}
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