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generics 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@905803 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Matthew Jason Benson 2010-02-02 21:23:25 +00:00
parent b92a2b5b0c
commit 9dbe765600
1 changed files with 16 additions and 15 deletions
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31
src/main/java/org/apache/commons/lang3/reflect/ConstructorUtils.java
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@ -82,7 +82,7 @@ public class ConstructorUtils {
* *
* @see #invokeConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[]) * @see #invokeConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
*/ */
public static Object invokeConstructor(Class<?> cls, Object arg) public static <T> T invokeConstructor(Class<T> cls, Object arg)
throws NoSuchMethodException, IllegalAccessException, throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException, InstantiationException { InvocationTargetException, InstantiationException {
return invokeConstructor(cls, new Object[] { arg }); return invokeConstructor(cls, new Object[] { arg });
@ -106,7 +106,7 @@ public class ConstructorUtils {
* *
* @see #invokeConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[]) * @see #invokeConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
*/ */
public static Object invokeConstructor(Class<?> cls, Object[] args) public static <T> T invokeConstructor(Class<T> cls, Object[] args)
throws NoSuchMethodException, IllegalAccessException, throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException, InstantiationException { InvocationTargetException, InstantiationException {
if (null == args) { if (null == args) {
@ -136,7 +136,7 @@ public class ConstructorUtils {
* @throws InstantiationException thrown on the constructor's invocation * @throws InstantiationException thrown on the constructor's invocation
* @see Constructor#newInstance * @see Constructor#newInstance
*/ */
public static Object invokeConstructor(Class<?> cls, Object[] args, public static <T> T invokeConstructor(Class<T> cls, Object[] args,
Class<?>[] parameterTypes) throws NoSuchMethodException, Class<?>[] parameterTypes) throws NoSuchMethodException,
IllegalAccessException, InvocationTargetException, IllegalAccessException, InvocationTargetException,
InstantiationException { InstantiationException {
@ -146,7 +146,7 @@ public class ConstructorUtils {
if (args == null) { if (args == null) {
args = ArrayUtils.EMPTY_OBJECT_ARRAY; args = ArrayUtils.EMPTY_OBJECT_ARRAY;
} }
Constructor<?> ctor = getMatchingAccessibleConstructor(cls, parameterTypes); Constructor<T> ctor = getMatchingAccessibleConstructor(cls, parameterTypes);
if (null == ctor) { if (null == ctor) {
throw new NoSuchMethodException( throw new NoSuchMethodException(
"No such accessible constructor on object: " "No such accessible constructor on object: "
@ -173,7 +173,7 @@ public class ConstructorUtils {
* *
* @see #invokeExactConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[]) * @see #invokeExactConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
*/ */
public static Object invokeExactConstructor(Class<?> cls, Object arg) public static <T> T invokeExactConstructor(Class<T> cls, Object arg)
throws NoSuchMethodException, IllegalAccessException, throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException, InstantiationException { InvocationTargetException, InstantiationException {
return invokeExactConstructor(cls, new Object[] { arg }); return invokeExactConstructor(cls, new Object[] { arg });
@ -197,7 +197,7 @@ public class ConstructorUtils {
* *
* @see #invokeExactConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[]) * @see #invokeExactConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
*/ */
public static Object invokeExactConstructor(Class<?> cls, Object[] args) public static <T> T invokeExactConstructor(Class<T> cls, Object[] args)
throws NoSuchMethodException, IllegalAccessException, throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException, InstantiationException { InvocationTargetException, InstantiationException {
if (null == args) { if (null == args) {
@ -229,7 +229,7 @@ public class ConstructorUtils {
* @throws InstantiationException thrown on the constructor's invocation * @throws InstantiationException thrown on the constructor's invocation
* @see Constructor#newInstance * @see Constructor#newInstance
*/ */
public static Object invokeExactConstructor(Class<?> cls, Object[] args, public static <T> T invokeExactConstructor(Class<T> cls, Object[] args,
Class<?>[] parameterTypes) throws NoSuchMethodException, Class<?>[] parameterTypes) throws NoSuchMethodException,
IllegalAccessException, InvocationTargetException, IllegalAccessException, InvocationTargetException,
InstantiationException { InstantiationException {
@ -239,7 +239,7 @@ public class ConstructorUtils {
if (parameterTypes == null) { if (parameterTypes == null) {
parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY; parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY;
} }
Constructor<?> ctor = getAccessibleConstructor(cls, parameterTypes); Constructor<T> ctor = getAccessibleConstructor(cls, parameterTypes);
if (null == ctor) { if (null == ctor) {
throw new NoSuchMethodException( throw new NoSuchMethodException(
"No such accessible constructor on object: " "No such accessible constructor on object: "
@ -256,7 +256,7 @@ public class ConstructorUtils {
* @see Class#getConstructor * @see Class#getConstructor
* @see #getAccessibleConstructor(java.lang.reflect.Constructor) * @see #getAccessibleConstructor(java.lang.reflect.Constructor)
*/ */
public static Constructor<?> getAccessibleConstructor(Class<?> cls, public static <T> Constructor<T> getAccessibleConstructor(Class<T> cls,
Class<?> parameterType) { Class<?> parameterType) {
return getAccessibleConstructor(cls, new Class[] { parameterType }); return getAccessibleConstructor(cls, new Class[] { parameterType });
} }
@ -269,7 +269,7 @@ public class ConstructorUtils {
* @see Class#getConstructor * @see Class#getConstructor
* @see #getAccessibleConstructor(java.lang.reflect.Constructor) * @see #getAccessibleConstructor(java.lang.reflect.Constructor)
*/ */
public static Constructor<?> getAccessibleConstructor(Class<?> cls, public static <T> Constructor<T> getAccessibleConstructor(Class<T> cls,
Class<?>[] parameterTypes) { Class<?>[] parameterTypes) {
try { try {
return getAccessibleConstructor(cls.getConstructor(parameterTypes)); return getAccessibleConstructor(cls.getConstructor(parameterTypes));
@ -284,7 +284,7 @@ public class ConstructorUtils {
* @return <code>null</code> if accessible constructor can not be found. * @return <code>null</code> if accessible constructor can not be found.
* @see java.lang.SecurityManager * @see java.lang.SecurityManager
*/ */
public static Constructor<?> getAccessibleConstructor(Constructor<?> ctor) { public static <T> Constructor<T> getAccessibleConstructor(Constructor<T> ctor) {
return MemberUtils.isAccessible(ctor) return MemberUtils.isAccessible(ctor)
&& Modifier.isPublic(ctor.getDeclaringClass().getModifiers()) ? ctor && Modifier.isPublic(ctor.getDeclaringClass().getModifiers()) ? ctor
: null; : null;
@ -305,17 +305,18 @@ public class ConstructorUtils {
* @param parameterTypes find method with compatible parameters * @param parameterTypes find method with compatible parameters
* @return a valid Constructor object. If there's no matching constructor, returns <code>null</code>. * @return a valid Constructor object. If there's no matching constructor, returns <code>null</code>.
*/ */
public static Constructor<?> getMatchingAccessibleConstructor(Class<?> cls, @SuppressWarnings("unchecked")
public static <T> Constructor<T> getMatchingAccessibleConstructor(Class<T> cls,
Class<?>[] parameterTypes) { Class<?>[] parameterTypes) {
// see if we can find the constructor directly // see if we can find the constructor directly
// most of the time this works and it's much faster // most of the time this works and it's much faster
try { try {
Constructor<?> ctor = cls.getConstructor(parameterTypes); Constructor<T> ctor = cls.getConstructor(parameterTypes);
MemberUtils.setAccessibleWorkaround(ctor); MemberUtils.setAccessibleWorkaround(ctor);
return ctor; return ctor;
} catch (NoSuchMethodException e) { /* SWALLOW */ } catch (NoSuchMethodException e) { /* SWALLOW */
} }
Constructor<?> result = null; Constructor<T> result = null;
// search through all constructors // search through all constructors
Constructor<?>[] ctors = cls.getConstructors(); Constructor<?>[] ctors = cls.getConstructors();
for (int i = 0; i < ctors.length; i++) { for (int i = 0; i < ctors.length; i++) {
@ -323,7 +324,7 @@ public class ConstructorUtils {
if (ClassUtils.isAssignable(parameterTypes, ctors[i] if (ClassUtils.isAssignable(parameterTypes, ctors[i]
.getParameterTypes(), true)) { .getParameterTypes(), true)) {
// get accessible version of method // get accessible version of method
Constructor<?> ctor = getAccessibleConstructor(ctors[i]); Constructor<T> ctor = getAccessibleConstructor((Constructor<T>) ctors[i]);
if (ctor != null) { if (ctor != null) {
MemberUtils.setAccessibleWorkaround(ctor); MemberUtils.setAccessibleWorkaround(ctor);
if (result == null if (result == null