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Diffstat (limited to 'libjava/classpath/vm/reference/java/lang/reflect/VMMethod.java')
| -rw-r--r-- | libjava/classpath/vm/reference/java/lang/reflect/VMMethod.java | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/libjava/classpath/vm/reference/java/lang/reflect/VMMethod.java b/libjava/classpath/vm/reference/java/lang/reflect/VMMethod.java new file mode 100644 index 000000000..d8bb8b4a3 --- /dev/null +++ b/libjava/classpath/vm/reference/java/lang/reflect/VMMethod.java @@ -0,0 +1,208 @@ +/* java.lang.reflect.VMMethod - VM interface for reflection of Java methods + Copyright (C) 1998, 2001, 2002, 2005, 2007, 2008 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +import java.lang.annotation.Annotation; + +import java.util.Arrays; + +final class VMMethod +{ + Class clazz; + String name; + int slot; + + /** + * This field allows us to refer back to the main constructor instance. + * It is set by the constructor of Field. + */ + Method m; + + public Class getDeclaringClass() + { + return clazz; + } + + public String getName() + { + return name; + } + + /** + * Return the raw modifiers for this method. + * @return the method's modifiers + */ + native int getModifiersInternal(); + + /** + * Gets the return type of this method. + * @return the type of this method + */ + native Class getReturnType(); + + /** + * Get the parameter list for this method, in declaration order. If the + * method takes no parameters, returns a 0-length array (not null). + * + * @return a list of the types of the method's parameters + */ + native Class[] getParameterTypes(); + + /** + * Get the exception types this method says it throws, in no particular + * order. If the method has no throws clause, returns a 0-length array + * (not null). + * + * @return a list of the types in the method's throws clause + */ + native Class[] getExceptionTypes(); + + native Object invoke(Object o, Object[] args) + throws IllegalAccessException, InvocationTargetException; + + /** + * Return the String in the Signature attribute for this method. If there + * is no Signature attribute, return null. + */ + native String getSignature(); + + /** + * If this method is an annotation method, returns the default + * value for the method. If there is no default value, or if the + * method is not a member of an annotation type, returns null. + * Primitive types are wrapped. + * + * @throws TypeNotPresentException if the method returns a Class, + * and the class cannot be found + * + * @since 1.5 + */ + native Object getDefaultValue(); + + /** + * <p> + * Return an array of arrays representing the annotations on each + * of the method's parameters. The outer array is aligned against + * the parameters of the method and is thus equal in length to + * the number of parameters (thus having a length zero if there are none). + * Each array element in the outer array contains an inner array which + * holds the annotations. This array has a length of zero if the parameter + * has no annotations. + * </p> + * <p> + * The returned annotations are serialized. Changing the annotations has + * no affect on the return value of future calls to this method. + * </p> + * + * @return an array of arrays which represents the annotations used on the + * parameters of this method. The order of the array elements + * matches the declaration order of the parameters. + * @since 1.5 + */ + native Annotation[][] getParameterAnnotations(); + + /** + * Compare two objects to see if they are semantically equivalent. + * Two Methods are semantically equivalent if they have the same declaring + * class, name, parameter list, and return type. + * + * @param o the object to compare to + * @return <code>true</code> if they are equal; <code>false</code> if not + */ + public boolean equals(Object o) + { + // Implementation note: + // The following is a correct but possibly slow implementation. + // + // This class has a private field 'slot' that could be used by + // the VM implementation to "link" a particular method to a Class. + // In that case equals could be simply implemented as: + // + // if (o instanceof Method) + // { + // Method m = (Method)o; + // return m.declaringClass == this.declaringClass + // && m.slot == this.slot; + // } + // return false; + // + // If a VM uses the Method class as their native/internal representation + // then just using the following would be optimal: + // + // return this == o; + // + if (!(o instanceof Method)) + return false; + Method that = (Method)o; + if (clazz != that.getDeclaringClass()) + return false; + if (!name.equals(that.getName())) + return false; + if (getReturnType() != that.getReturnType()) + return false; + if (!Arrays.equals(getParameterTypes(), that.getParameterTypes())) + return false; + return true; + } + + /** + * Returns the element's annotation for the specified annotation type, + * or <code>null</code> if no such annotation exists. + * + * @param annotationClass the type of annotation to look for. + * @return this element's annotation for the specified type, or + * <code>null</code> if no such annotation exists. + * @throws NullPointerException if the annotation class is <code>null</code>. + */ + native Annotation getAnnotation(Class annotationClass); + + /** + * Returns all annotations directly defined by the element. If there are + * no annotations directly associated with the element, then a zero-length + * array will be returned. The returned array may be modified by the client + * code, but this will have no effect on the annotation content of this + * class, and hence no effect on the return value of this method for + * future callers. + * + * @return the annotations directly defined by the element. + * @since 1.5 + */ + native Annotation[] getDeclaredAnnotations(); + +} |