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From-SVN: r102075
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Tom Tromey
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295
libjava/classpath/vm/reference/java/lang/VMClass.java
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libjava/classpath/vm/reference/java/lang/VMClass.java
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/* VMClass.java -- VM Specific Class methods
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Copyright (C) 2003, 2004 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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/*
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* This class is a reference version, mainly for compiling a class library
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* jar. It is likely that VM implementers replace this with their own
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* version that can communicate effectively with the VM.
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*/
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/**
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*
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* @author Etienne Gagnon <etienne.gagnon@uqam.ca>
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* @author Archie Cobbs <archie@dellroad.org>
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* @author C. Brian Jones <cbj@gnu.org>
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*/
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final class VMClass
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{
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// Only static methods. Cannot be instantiated.
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private VMClass()
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{
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}
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/**
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* Discover whether an Object is an instance of this Class. Think of it
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* as almost like <code>o instanceof (this class)</code>.
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*
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* @param klass the Class object that's calling us
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* @param o the Object to check
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* @return whether o is an instance of this class
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* @since 1.1
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*/
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static native boolean isInstance(Class klass, Object o);
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/**
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* Discover whether an instance of the Class parameter would be an
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* instance of this Class as well. Think of doing
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* <code>isInstance(c.newInstance())</code> or even
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* <code>c.newInstance() instanceof (this class)</code>. While this
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* checks widening conversions for objects, it must be exact for primitive
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* types.
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*
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* @param klass the Class object that's calling us
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* @param c the class to check
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* @return whether an instance of c would be an instance of this class
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* as well
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* @throws NullPointerException if c is null
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* @since 1.1
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*/
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static native boolean isAssignableFrom(Class klass, Class c);
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/**
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* Check whether this class is an interface or not. Array types are not
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* interfaces.
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*
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* @param klass the Class object that's calling us
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* @return whether this class is an interface or not
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*/
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static native boolean isInterface(Class klass);
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/**
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* Return whether this class is a primitive type. A primitive type class
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* is a class representing a kind of "placeholder" for the various
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* primitive types, or void. You can access the various primitive type
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* classes through java.lang.Boolean.TYPE, java.lang.Integer.TYPE, etc.,
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* or through boolean.class, int.class, etc.
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*
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* @param klass the Class object that's calling us
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* @return whether this class is a primitive type
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* @see Boolean#TYPE
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* @see Byte#TYPE
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* @see Character#TYPE
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* @see Short#TYPE
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* @see Integer#TYPE
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* @see Long#TYPE
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* @see Float#TYPE
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* @see Double#TYPE
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* @see Void#TYPE
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* @since 1.1
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*/
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static native boolean isPrimitive(Class klass);
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/**
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* Get the name of this class, separated by dots for package separators.
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* Primitive types and arrays are encoded as:
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* <pre>
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* boolean Z
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* byte B
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* char C
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* short S
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* int I
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* long J
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* float F
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* double D
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* void V
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* array type [<em>element type</em>
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* class or interface, alone: <dotted name>
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* class or interface, as element type: L<dotted name>;
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*
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* @param klass the Class object that's calling us
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* @return the name of this class
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*/
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static native String getName(Class klass);
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/**
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* Get the direct superclass of this class. If this is an interface,
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* Object, a primitive type, or void, it will return null. If this is an
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* array type, it will return Object.
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*
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* @param klass the Class object that's calling us
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* @return the direct superclass of this class
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*/
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static native Class getSuperclass(Class klass);
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/**
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* Get the interfaces this class <EM>directly</EM> implements, in the
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* order that they were declared. This returns an empty array, not null,
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* for Object, primitives, void, and classes or interfaces with no direct
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* superinterface. Array types return Cloneable and Serializable.
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*
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* @param klass the Class object that's calling us
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* @return the interfaces this class directly implements
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*/
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static native Class[] getInterfaces(Class klass);
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/**
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* If this is an array, get the Class representing the type of array.
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* Examples: "[[Ljava.lang.String;" would return "[Ljava.lang.String;", and
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* calling getComponentType on that would give "java.lang.String". If
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* this is not an array, returns null.
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*
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* @param klass the Class object that's calling us
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* @return the array type of this class, or null
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* @see Array
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* @since 1.1
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*/
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static native Class getComponentType(Class klass);
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/**
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* Get the modifiers of this class. These can be decoded using Modifier,
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* and is limited to one of public, protected, or private, and any of
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* final, static, abstract, or interface. An array class has the same
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* public, protected, or private modifier as its component type, and is
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* marked final but not an interface. Primitive types and void are marked
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* public and final, but not an interface.
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*
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* @param klass the Class object that's calling us
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* @param ignoreInnerClassesAttrib if set, return the real modifiers, not
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* the ones specified in the InnerClasses attribute.
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* @return the modifiers of this class
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* @see Modifer
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* @since 1.1
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*/
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static native int getModifiers(Class klass, boolean ignoreInnerClassesAttrib);
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/**
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* If this is a nested or inner class, return the class that declared it.
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* If not, return null.
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*
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* @param klass the Class object that's calling us
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* @return the declaring class of this class
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* @since 1.1
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*/
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static native Class getDeclaringClass(Class klass);
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/**
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* Like <code>getDeclaredClasses()</code> but without the security checks.
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*
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* @param klass the Class object that's calling us
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* @param pulicOnly Only public classes should be returned
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*/
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static native Class[] getDeclaredClasses(Class klass, boolean publicOnly);
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/**
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* Like <code>getDeclaredFields()</code> but without the security checks.
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*
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* @param klass the Class object that's calling us
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* @param pulicOnly Only public fields should be returned
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*/
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static native Field[] getDeclaredFields(Class klass, boolean publicOnly);
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/**
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* Like <code>getDeclaredMethods()</code> but without the security checks.
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*
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* @param klass the Class object that's calling us
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* @param pulicOnly Only public methods should be returned
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*/
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static native Method[] getDeclaredMethods(Class klass, boolean publicOnly);
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/**
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* Like <code>getDeclaredConstructors()</code> but without
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* the security checks.
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*
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* @param klass the Class object that's calling us
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* @param pulicOnly Only public constructors should be returned
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*/
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static native Constructor[] getDeclaredConstructors(Class klass, boolean publicOnly);
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/**
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* Return the class loader of this class.
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*
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* @param klass the Class object that's calling us
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* @return the class loader
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*/
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static native ClassLoader getClassLoader(Class klass);
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/**
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* VM implementors are free to make this method a noop if
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* the default implementation is acceptable.
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*
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* @param name the name of the class to find
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* @return the Class object representing the class or null for noop
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* @throws ClassNotFoundException if the class was not found by the
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* classloader
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* @throws LinkageError if linking the class fails
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* @throws ExceptionInInitializerError if the class loads, but an exception
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* occurs during initialization
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*/
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static native Class forName(String name) throws ClassNotFoundException;
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/**
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* Return whether this class is an array type.
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*
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* @param klass the Class object that's calling us
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* @return true if this class is an array type
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* operation
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*/
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static native boolean isArray(Class klass);
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/**
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* This method should trigger class initialization (if the
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* class hasn't already been initialized)
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*
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* @param klass the Class object that's calling us
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* @throws ExceptionInInitializerError if an exception
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* occurs during initialization
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*/
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static native void initialize(Class klass);
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/**
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* Load an array class.
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*
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* @return the Class object representing the class
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* @throws ClassNotFoundException if the class was not found by the
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* classloader
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*/
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static native Class loadArrayClass(String name, ClassLoader classloader)
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throws ClassNotFoundException;
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/**
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* Throw a checked exception without declaring it.
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*/
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static native void throwException(Throwable t);
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} // class VMClass
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