10:21 p.m.
Author: epbernard
Date: 2009-04-25 23:21:45 -0400 (Sat, 25 Apr 2009)
New Revision: 16438
Modified:
core/trunk/commons-annotations/src/main/java/org/hibernate/annotations/common/util/ReflectHelper.java
Log:
fix circular dependency between ReflectHelpers and remove all dependencies.
Modified:
core/trunk/commons-annotations/src/main/java/org/hibernate/annotations/common/util/ReflectHelper.java
===================================================================
---
core/trunk/commons-annotations/src/main/java/org/hibernate/annotations/common/util/ReflectHelper.java 2009-04-24
21:05:09 UTC (rev 16437)
+++
core/trunk/commons-annotations/src/main/java/org/hibernate/annotations/common/util/ReflectHelper.java 2009-04-26
03:21:45 UTC (rev 16438)
@@ -23,56 +23,211 @@
*/
package org.hibernate.annotations.common.util;
+import java.lang.reflect.Member;
import java.lang.reflect.Method;
-import java.lang.reflect.Member;
+import java.lang.reflect.Modifier;
+import org.hibernate.AssertionFailure;
+import org.hibernate.util.StringHelper;
+
/**
* Complete duplication of {@link org.hibernate.util.ReflectHelper}.
*
* @author Emmanuel Bernard
*/
public final class ReflectHelper {
+
+ public static final Class[] NO_PARAM_SIGNATURE = new Class[0];
+ public static final Object[] NO_PARAMS = new Object[0];
+
+ public static final Class[] SINGLE_OBJECT_PARAM_SIGNATURE = new Class[] { Object.class
};
+
+ private static final Method OBJECT_EQUALS;
+ private static final Method OBJECT_HASHCODE;
+
+ static {
+ Method eq;
+ Method hash;
+ try {
+ eq = extractEqualsMethod( Object.class );
+ hash = extractHashCodeMethod( Object.class );
+ }
+ catch ( Exception e ) {
+ throw new AssertionFailure( "Could not find Object.equals() or
Object.hashCode()", e );
+ }
+ OBJECT_EQUALS = eq;
+ OBJECT_HASHCODE = hash;
+ }
+
+ /**
+ * Disallow instantiation of ReflectHelper.
+ */
+ private ReflectHelper() {
+ }
+
+ /**
+ * Encapsulation of getting hold of a class's {@link Object#equals equals} method.
+ *
+ * @param clazz The class from which to extract the equals method.
+ * @return The equals method reference
+ * @throws NoSuchMethodException Should indicate an attempt to extract equals method
from interface.
+ */
+ public static Method extractEqualsMethod(Class clazz) throws NoSuchMethodException {
+ return clazz.getMethod( "equals", SINGLE_OBJECT_PARAM_SIGNATURE );
+ }
+
+ /**
+ * Encapsulation of getting hold of a class's {@link Object#hashCode hashCode}
method.
+ *
+ * @param clazz The class from which to extract the hashCode method.
+ * @return The hashCode method reference
+ * @throws NoSuchMethodException Should indicate an attempt to extract hashCode method
from interface.
+ */
+ public static Method extractHashCodeMethod(Class clazz) throws NoSuchMethodException {
+ return clazz.getMethod( "hashCode", NO_PARAM_SIGNATURE );
+ }
+
+ /**
+ * Determine if the given class defines an {@link Object#equals} override.
+ *
+ * @param clazz The class to check
+ * @return True if clazz defines an equals override.
+ */
public static boolean overridesEquals(Class clazz) {
- return org.hibernate.util.ReflectHelper.overridesEquals( clazz );
+ Method equals;
+ try {
+ equals = extractEqualsMethod( clazz );
+ }
+ catch ( NoSuchMethodException nsme ) {
+ return false; //its an interface so we can't really tell anything...
+ }
+ return !OBJECT_EQUALS.equals( equals );
}
+ /**
+ * Determine if the given class defines a {@link Object#hashCode} override.
+ *
+ * @param clazz The class to check
+ * @return True if clazz defines an hashCode override.
+ */
public static boolean overridesHashCode(Class clazz) {
- return org.hibernate.util.ReflectHelper.overridesHashCode( clazz );
+ Method hashCode;
+ try {
+ hashCode = extractHashCodeMethod( clazz );
+ }
+ catch ( NoSuchMethodException nsme ) {
+ return false; //its an interface so we can't really tell anything...
+ }
+ return !OBJECT_HASHCODE.equals( hashCode );
}
- public static Class classForName(String name) throws ClassNotFoundException {
- return ReflectHelper.classForName( name );
+ /**
+ * Perform resolution of a class name.
+ * <p/>
+ * Here we first check the context classloader, if one, before delegating to
+ * {@link Class#forName(String, boolean, ClassLoader)} using the caller's
classloader
+ *
+ * @param name The class name
+ * @param caller The class from which this call originated (in order to access that
class's loader).
+ * @return The class reference.
+ * @throws ClassNotFoundException From {@link Class#forName(String, boolean,
ClassLoader)}.
+ */
+ public static Class classForName(String name, Class caller) throws
ClassNotFoundException {
+ try {
+ ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
+ if ( contextClassLoader != null ) {
+ return contextClassLoader.loadClass( name );
+ }
+ }
+ catch ( Throwable ignore ) {
+ }
+ return Class.forName( name, true, caller.getClassLoader() );
}
- public static Class classForName(String name, Class caller) throws
ClassNotFoundException {
- return org.hibernate.util.ReflectHelper.classForName( name, caller );
+ /**
+ * Perform resolution of a class name.
+ * <p/>
+ * Same as {@link #classForName(String, Class)} except that here we delegate to
+ * {@link Class#forName(String)} if the context classloader lookup is unsuccessful.
+ *
+ * @param name The class name
+ * @return The class reference.
+ * @throws ClassNotFoundException From {@link Class#forName(String)}.
+ */
+ public static Class classForName(String name) throws ClassNotFoundException {
+ try {
+ ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
+ if ( contextClassLoader != null ) {
+ return contextClassLoader.loadClass(name);
+ }
+ }
+ catch ( Throwable ignore ) {
+ }
+ return Class.forName( name );
}
+ /**
+ * Is this member publicly accessible.
+ *
+ * @param clazz The class which defines the member
+ * @param member The memeber.
+ * @return True if the member is publicly accessible, false otherwise.
+ */
public static boolean isPublic(Class clazz, Member member) {
- return org.hibernate.util.ReflectHelper.isPublic( clazz, member );
+ return Modifier.isPublic( member.getModifiers() ) && Modifier.isPublic(
clazz.getModifiers() );
}
+ /**
+ * Resolve a constant to its actual value.
+ *
+ * @param name The name
+ * @return The value
+ */
public static Object getConstantValue(String name) {
- return org.hibernate.util.ReflectHelper.getConstantValue( name );
+ Class clazz;
+ try {
+ clazz = classForName( org.hibernate.util.StringHelper.qualifier( name ) );
+ }
+ catch ( Throwable t ) {
+ return null;
+ }
+ try {
+ return clazz.getField( StringHelper.unqualify( name ) ).get( null );
+ }
+ catch ( Throwable t ) {
+ return null;
+ }
}
+ /**
+ * Determine if the given class is declared abstract.
+ *
+ * @param clazz The class to check.
+ * @return True if the class is abstract, false otherwise.
+ */
public static boolean isAbstractClass(Class clazz) {
- return org.hibernate.util.ReflectHelper.isAbstractClass( clazz );
+ int modifier = clazz.getModifiers();
+ return Modifier.isAbstract(modifier) || Modifier.isInterface(modifier);
}
+ /**
+ * Determine is the given class is declared final.
+ *
+ * @param clazz The class to check.
+ * @return True if the class is final, flase otherwise.
+ */
public static boolean isFinalClass(Class clazz) {
- return org.hibernate.util.ReflectHelper.isFinalClass( clazz );
+ return Modifier.isFinal( clazz.getModifiers() );
}
public static Method getMethod(Class clazz, Method method) {
- return org.hibernate.util.ReflectHelper.getMethod( clazz, method );
+ try {
+ return clazz.getMethod( method.getName(), method.getParameterTypes() );
+ }
+ catch (Exception e) {
+ return null;
+ }
}
- /**
- * Direct instantiation of ReflectHelper disallowed.
- */
- private ReflectHelper() {
- }
-
}