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ClassHelper 'hasInterface' now checks parents as well

This commit is contained in:
nathan 2015-07-27 18:22:34 +02:00
parent 8105582f47
commit 1abb0735ae
1 changed files with 29 additions and 10 deletions
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39
Dorkbox-Util/src/dorkbox/util/ClassHelper.java
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@ -17,7 +17,7 @@ package dorkbox.util;
import java.lang.reflect.*;
public
public final
class ClassHelper {
/**
@ -27,6 +27,7 @@ class ClassHelper {
* @param clazz class to get the parameter from
* @param genericParameterToGet 0-based index of parameter as class to get
*/
@SuppressWarnings({"StatementWithEmptyBody", "UnnecessaryLocalVariable"})
public static
Class<?> getGenericParameterAsClassForSuperClass(Class<?> clazz, int genericParameterToGet) {
Class<?> classToCheck = clazz;
@ -40,7 +41,7 @@ class ClassHelper {
Type[] actualTypeArguments = ((ParameterizedType) superClassGeneric).getActualTypeArguments();
// is it possible?
if (actualTypeArguments.length > genericParameterToGet) {
Class<?> rawTypeAsClass = ClassHelper.getRawTypeAsClass(actualTypeArguments[genericParameterToGet]);
Class<?> rawTypeAsClass = getRawTypeAsClass(actualTypeArguments[genericParameterToGet]);
return rawTypeAsClass;
}
else {
@ -53,8 +54,6 @@ class ClassHelper {
classToCheck = classToCheck.getSuperclass();
}
classToCheck = clazz;
// NOTHING! now check interfaces!
classToCheck = clazz;
while (classToCheck != Object.class) {
@ -70,7 +69,6 @@ class ClassHelper {
}
else {
// record the parameters.
}
}
}
@ -88,6 +86,7 @@ class ClassHelper {
/**
* Return the class that is this type.
*/
@SuppressWarnings("UnnecessaryLocalVariable")
public static
Class<?> getRawTypeAsClass(Type type) {
if (type instanceof Class) {
@ -132,7 +131,7 @@ class ClassHelper {
/**
* Check to see if clazz or interface directly has one of the interfaces defined by clazzItMustHave
* <p/>
* If the class DOES NOT directly have the interface it will fail. the PARENT class is not checked.
* If the class DOES NOT directly have the interface it will fail.
*/
public static
boolean hasInterface(Class<?> clazzItMustHave, Class<?> clazz) {
@ -148,7 +147,25 @@ class ClassHelper {
}
// now walk up to see if we can find it.
for (Class<?> iface : interfaces) {
return hasInterface(clazzItMustHave, iface);
boolean b = hasInterface(clazzItMustHave, iface);
if (b) {
return b;
}
}
// nothing, so now we check the PARENT of this class
Class<?> superClass = clazz.getSuperclass();
// case of multiple inheritance, we are trying to get the first available generic info
// don't check for Object.class (this is where superclass is null)
while (superClass != null && superClass != Object.class) {
// check to see if we have what we are looking for on our CURRENT class
if (hasInterface(clazzItMustHave, superClass)) {
return true;
}
// NO MATCH, so walk up.
superClass = superClass.getSuperclass();
}
// if we don't find it.
@ -157,10 +174,8 @@ class ClassHelper {
/**
* Checks to see if the clazz is a subclass of a parent class.
*
* @param baseClass
* @param genericClass
*/
@SuppressWarnings("SimplifiableIfStatement")
public static
boolean hasParentClass(Class<?> parentClazz, Class<?> clazz) {
Class<?> superClass = clazz.getSuperclass();
@ -174,4 +189,8 @@ class ClassHelper {
return false;
}
private
ClassHelper() {
}
}