net.hasor.utils.reflect.MemberUtils Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.hasor.utils.reflect;
import net.hasor.utils.ArrayUtils;
import net.hasor.utils.ClassUtils;
import net.hasor.utils.StringUtils;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
/**
* Contains common code for working with Methods/Constructors, extracted and
* refactored from MethodUtils when it was imported from Commons
* BeanUtils.
*
* @author Apache Software Foundation
* @author Steve Cohen
* @author Matt Benson
* @since 2.5
* @version $Id: MemberUtils.java 1057013 2011-01-09 20:04:16Z niallp $
*/
abstract class MemberUtils {
// TODO extract an interface to implement compareParameterSets(...)?
private static final int ACCESS_TEST = Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE;
private static final Method IS_SYNTHETIC;
//
public static float toVersionFloat() {
int limit = 3;
String version = null;
try {
version = System.getProperty("java.version");
} catch (SecurityException ex) {
version = null;
}
int[] javaVersions = null;
if (version == null) {
javaVersions = ArrayUtils.EMPTY_INT_ARRAY;
} else {
String[] strings = StringUtils.split(version, "._- ");
int[] ints = new int[Math.min(limit, strings.length)];
int j = 0;
for (int i = 0; i < strings.length && j < limit; i++) {
String s = strings[i];
if (s.length() > 0) {
try {
ints[j] = Integer.parseInt(s);
j++;
} catch (Exception e) {
}
}
}
if (ints.length > j) {
int[] newInts = new int[j];
System.arraycopy(ints, 0, newInts, 0, j);
ints = newInts;
}
javaVersions = ints;
}
//
if (javaVersions == null || javaVersions.length == 0) {
return 0f;
}
if (javaVersions.length == 1) {
return javaVersions[0];
}
StringBuffer builder = new StringBuffer();
builder.append(javaVersions[0]);
builder.append('.');
for (int i = 1; i < javaVersions.length; i++) {
builder.append(javaVersions[i]);
}
try {
return Float.parseFloat(builder.toString());
} catch (Exception ex) {
return 0f;
}
}
static {
Method isSynthetic = null;
if (toVersionFloat() >= 1.5f) {
// cannot call synthetic methods:
try {
isSynthetic = Member.class.getMethod("isSynthetic", ArrayUtils.EMPTY_CLASS_ARRAY);
} catch (Exception e) {
}
}
IS_SYNTHETIC = isSynthetic;
}
/** Array of primitive number types ordered by "promotability" */
private static final Class[] ORDERED_PRIMITIVE_TYPES = { Byte.TYPE, Short.TYPE, Character.TYPE, Integer.TYPE, Long.TYPE, Float.TYPE, Double.TYPE };
/**
* XXX Default access superclass workaround
*
* When a public class has a default access superclass with public members,
* these members are accessible. Calling them from compiled code works fine.
* Unfortunately, on some JVMs, using reflection to invoke these members
* seems to (wrongly) to prevent access even when the modifer is public.
* Calling setAccessible(true) solves the problem but will only work from
* sufficiently privileged code. Better workarounds would be gratefully
* accepted.
* @param o the AccessibleObject to set as accessible
*/
static void setAccessibleWorkaround(final AccessibleObject o) {
if (o == null || o.isAccessible()) {
return;
}
Member m = (Member) o;
if (Modifier.isPublic(m.getModifiers()) && MemberUtils.isPackageAccess(m.getDeclaringClass().getModifiers())) {
try {
o.setAccessible(true);
} catch (SecurityException e) {
// ignore in favor of subsequent IllegalAccessException
}
}
}
/**
* Learn whether a given set of modifiers implies package access.
* @param modifiers to test
* @return true unless package/protected/private modifier detected
*/
static boolean isPackageAccess(final int modifiers) {
return (modifiers & MemberUtils.ACCESS_TEST) == 0;
}
/**
* Check a Member for basic accessibility.
* @param m Member to check
* @return true if m is accessible
*/
static boolean isAccessible(final Member m) {
return m != null && Modifier.isPublic(m.getModifiers()) && !MemberUtils.isSynthetic(m);
}
/**
* Try to learn whether a given member, on JDK >= 1.5, is synthetic.
* @param m Member to check
* @return true if m was introduced by the compiler.
*/
static boolean isSynthetic(final Member m) {
if (MemberUtils.IS_SYNTHETIC != null) {
try {
return ((Boolean) MemberUtils.IS_SYNTHETIC.invoke(m)).booleanValue();
} catch (Exception e) {
}
}
return false;
}
/**
* Compare the relative fitness of two sets of parameter types in terms of
* matching a third set of runtime parameter types, such that a list ordered
* by the results of the comparison would return the best match first
* (least).
*
* @param left the "left" parameter set
* @param right the "right" parameter set
* @param actual the runtime parameter types to match against
* left/right
* @return int consistent with compare semantics
*/
static int compareParameterTypes(final Class[] left, final Class[] right, final Class[] actual) {
float leftCost = MemberUtils.getTotalTransformationCost(actual, left);
float rightCost = MemberUtils.getTotalTransformationCost(actual, right);
return leftCost < rightCost ? -1 : rightCost < leftCost ? 1 : 0;
}
/**
* Returns the sum of the object transformation cost for each class in the
* source argument list.
* @param srcArgs The source arguments
* @param destArgs The destination arguments
* @return The total transformation cost
*/
private static float getTotalTransformationCost(final Class[] srcArgs, final Class[] destArgs) {
float totalCost = 0.0f;
for (int i = 0; i < srcArgs.length; i++) {
Class srcClass, destClass;
srcClass = srcArgs[i];
destClass = destArgs[i];
totalCost += MemberUtils.getObjectTransformationCost(srcClass, destClass);
}
return totalCost;
}
/**
* Gets the number of steps required needed to turn the source class into
* the destination class. This represents the number of steps in the object
* hierarchy graph.
* @param srcClass The source class
* @param destClass The destination class
* @return The cost of transforming an object
*/
private static float getObjectTransformationCost(Class srcClass, final Class destClass) {
if (destClass.isPrimitive()) {
return MemberUtils.getPrimitivePromotionCost(srcClass, destClass);
}
float cost = 0.0f;
while (srcClass != null && !destClass.equals(srcClass)) {
if (destClass.isInterface() && ClassUtils.isAssignable(srcClass, destClass)) {
// slight penalty for interface match.
// we still want an exact match to override an interface match,
// but
// an interface match should override anything where we have to
// get a superclass.
cost += 0.25f;
break;
}
cost++;
srcClass = srcClass.getSuperclass();
}
/*
* If the destination class is null, we've travelled all the way up to
* an Object match. We'll penalize this by adding 1.5 to the cost.
*/
if (srcClass == null) {
cost += 1.5f;
}
return cost;
}
/**
* Get the number of steps required to promote a primitive number to another
* type.
* @param srcClass the (primitive) source class
* @param destClass the (primitive) destination class
* @return The cost of promoting the primitive
*/
private static float getPrimitivePromotionCost(final Class srcClass, final Class destClass) {
float cost = 0.0f;
Class cls = srcClass;
if (!cls.isPrimitive()) {
// slight unwrapping penalty
cost += 0.1f;
cls = ClassUtils.wrapperToPrimitive(cls);
}
for (int i = 0; cls != destClass && i < MemberUtils.ORDERED_PRIMITIVE_TYPES.length; i++) {
if (cls == MemberUtils.ORDERED_PRIMITIVE_TYPES[i]) {
cost += 0.1f;
if (i < MemberUtils.ORDERED_PRIMITIVE_TYPES.length - 1) {
cls = MemberUtils.ORDERED_PRIMITIVE_TYPES[i + 1];
}
}
}
return cost;
}
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