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jeremybenn |
/* java.lang.reflect.Field - VM interface for reflection of Java fields
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Copyright (C) 1998, 2001, 2005, 2008 Free Software Foundation, Inc.
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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.reflect;
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import java.lang.annotation.Annotation;
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final class VMField
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{
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Class clazz;
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String name;
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int slot;
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/**
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* This field allows us to refer back to the main constructor instance.
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* It is set by the constructor of Field.
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*/
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Field f;
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VMField(Class clazz, String name, int slot)
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{
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this.clazz = clazz;
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this.name = name;
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this.slot = slot;
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}
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public Class getDeclaringClass()
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{
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return clazz;
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}
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public String getName()
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{
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return name;
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}
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/**
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* Return the raw modifiers for this field.
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* @return the field's modifiers
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*/
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native int getModifiersInternal();
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/**
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* Gets the type of this field.
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* @return the type of this field
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*/
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native Class getType();
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/**
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* Get the value of this Field. If it is primitive, it will be wrapped
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* in the appropriate wrapper type (boolean = java.lang.Boolean).<p>
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*
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* If the field is static, <code>o</code> will be ignored. Otherwise, if
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* <code>o</code> is null, you get a <code>NullPointerException</code>,
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* and if it is incompatible with the declaring class of the field, you
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* get an <code>IllegalArgumentException</code>.<p>
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*
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* Next, if this Field enforces access control, your runtime context is
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* evaluated, and you may have an <code>IllegalAccessException</code> if
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* you could not access this field in similar compiled code. If the field
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* is static, and its class is uninitialized, you trigger class
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* initialization, which may end in a
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* <code>ExceptionInInitializerError</code>.<p>
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*
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* Finally, the field is accessed, and primitives are wrapped (but not
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* necessarily in new objects). This method accesses the field of the
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* declaring class, even if the instance passed in belongs to a subclass
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* which declares another field to hide this one.
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*
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* @param o the object to get the value of this Field from
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* @return the value of the Field
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if <code>o</code> is not an instance of
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* the class or interface declaring this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #getBoolean(Object)
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* @see #getByte(Object)
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* @see #getChar(Object)
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* @see #getShort(Object)
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* @see #getInt(Object)
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* @see #getLong(Object)
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* @see #getFloat(Object)
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* @see #getDouble(Object)
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*/
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native Object get(Object o)
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throws IllegalAccessException;
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/**
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* Get the value of this boolean Field. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
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* @return the value of the Field
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if this is not a boolean field of
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* <code>o</code>, or if <code>o</code> is not an instance of the
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* declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
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*/
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native boolean getBoolean(Object o)
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throws IllegalAccessException;
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/**
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* Get the value of this byte Field. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
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* @return the value of the Field
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if this is not a byte field of
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* <code>o</code>, or if <code>o</code> is not an instance of the
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* declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
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*/
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native byte getByte(Object o)
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throws IllegalAccessException;
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/**
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* Get the value of this Field as a char. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if this is not a char field of
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* <code>o</code>, or if <code>o</code> is not an instance
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* of the declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
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*/
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native char getChar(Object o)
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throws IllegalAccessException;
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/**
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* Get the value of this Field as a short. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
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* @return the value of the Field
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if this is not a byte or short
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* field of <code>o</code>, or if <code>o</code> is not an instance
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* of the declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
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*/
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native short getShort(Object o)
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throws IllegalAccessException;
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/**
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* Get the value of this Field as an int. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
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* @return the value of the Field
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if this is not a byte, short, char, or
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* int field of <code>o</code>, or if <code>o</code> is not an
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* instance of the declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
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*/
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native int getInt(Object o)
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throws IllegalAccessException;
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/**
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* Get the value of this Field as a long. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
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* @return the value of the Field
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
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* @throws IllegalArgumentException if this is not a byte, short, char, int,
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* or long field of <code>o</code>, or if <code>o</code> is not an
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* instance of the declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
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*/
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native long getLong(Object o)
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throws IllegalAccessException;
|
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|
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/**
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* Get the value of this Field as a float. If the field is static,
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* <code>o</code> will be ignored.
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*
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* @param o the object to get the value of this Field from
|
251 |
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* @return the value of the Field
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252 |
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* @throws IllegalAccessException if you could not normally access this field
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* (i.e. it is not public)
|
254 |
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* @throws IllegalArgumentException if this is not a byte, short, char, int,
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|
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* long, or float field of <code>o</code>, or if <code>o</code> is
|
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* not an instance of the declaring class of this field
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* @throws NullPointerException if <code>o</code> is null and this field
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* requires an instance
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* @throws ExceptionInInitializerError if accessing a static field triggered
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* class initialization, which then failed
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* @see #get(Object)
|
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|
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*/
|
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native float getFloat(Object o)
|
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throws IllegalAccessException;
|
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|
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|
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/**
|
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|
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* Get the value of this Field as a double. If the field is static,
|
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* <code>o</code> will be ignored.
|
269 |
|
|
*
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|
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* @param o the object to get the value of this Field from
|
271 |
|
|
* @return the value of the Field
|
272 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
273 |
|
|
* (i.e. it is not public)
|
274 |
|
|
* @throws IllegalArgumentException if this is not a byte, short, char, int,
|
275 |
|
|
* long, float, or double field of <code>o</code>, or if
|
276 |
|
|
* <code>o</code> is not an instance of the declaring class of this
|
277 |
|
|
* field
|
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|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
279 |
|
|
* requires an instance
|
280 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
281 |
|
|
* class initialization, which then failed
|
282 |
|
|
* @see #get(Object)
|
283 |
|
|
*/
|
284 |
|
|
native double getDouble(Object o)
|
285 |
|
|
throws IllegalAccessException;
|
286 |
|
|
|
287 |
|
|
/**
|
288 |
|
|
* Set the value of this Field. If it is a primitive field, the value
|
289 |
|
|
* will be unwrapped from the passed object (boolean = java.lang.Boolean).<p>
|
290 |
|
|
*
|
291 |
|
|
* If the field is static, <code>o</code> will be ignored. Otherwise, if
|
292 |
|
|
* <code>o</code> is null, you get a <code>NullPointerException</code>,
|
293 |
|
|
* and if it is incompatible with the declaring class of the field, you
|
294 |
|
|
* get an <code>IllegalArgumentException</code>.<p>
|
295 |
|
|
*
|
296 |
|
|
* Next, if this Field enforces access control, your runtime context is
|
297 |
|
|
* evaluated, and you may have an <code>IllegalAccessException</code> if
|
298 |
|
|
* you could not access this field in similar compiled code. This also
|
299 |
|
|
* occurs whether or not there is access control if the field is final.
|
300 |
|
|
* If the field is primitive, and unwrapping your argument fails, you will
|
301 |
|
|
* get an <code>IllegalArgumentException</code>; likewise, this error
|
302 |
|
|
* happens if <code>value</code> cannot be cast to the correct object type.
|
303 |
|
|
* If the field is static, and its class is uninitialized, you trigger class
|
304 |
|
|
* initialization, which may end in a
|
305 |
|
|
* <code>ExceptionInInitializerError</code>.<p>
|
306 |
|
|
*
|
307 |
|
|
* Finally, the field is set with the widened value. This method accesses
|
308 |
|
|
* the field of the declaring class, even if the instance passed in belongs
|
309 |
|
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* to a subclass which declares another field to hide this one.
|
310 |
|
|
*
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311 |
|
|
* @param o the object to set this Field on
|
312 |
|
|
* @param value the value to set this Field to
|
313 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
314 |
|
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* (i.e. it is not public)
|
315 |
|
|
* @throws IllegalArgumentException if <code>value</code> cannot be
|
316 |
|
|
* converted by a widening conversion to the underlying type of
|
317 |
|
|
* the Field, or if <code>o</code> is not an instance of the class
|
318 |
|
|
* declaring this field
|
319 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
320 |
|
|
* requires an instance
|
321 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
322 |
|
|
* class initialization, which then failed
|
323 |
|
|
* @see #setBoolean(Object, boolean)
|
324 |
|
|
* @see #setByte(Object, byte)
|
325 |
|
|
* @see #setChar(Object, char)
|
326 |
|
|
* @see #setShort(Object, short)
|
327 |
|
|
* @see #setInt(Object, int)
|
328 |
|
|
* @see #setLong(Object, long)
|
329 |
|
|
* @see #setFloat(Object, float)
|
330 |
|
|
* @see #setDouble(Object, double)
|
331 |
|
|
*/
|
332 |
|
|
native void set(Object o, Object value)
|
333 |
|
|
throws IllegalAccessException;
|
334 |
|
|
|
335 |
|
|
/**
|
336 |
|
|
* Set this boolean Field. If the field is static, <code>o</code> will be
|
337 |
|
|
* ignored.
|
338 |
|
|
*
|
339 |
|
|
* @param o the object to set this Field on
|
340 |
|
|
* @param value the value to set this Field to
|
341 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
342 |
|
|
* (i.e. it is not public)
|
343 |
|
|
* @throws IllegalArgumentException if this is not a boolean field, or if
|
344 |
|
|
* <code>o</code> is not an instance of the class declaring this
|
345 |
|
|
* field
|
346 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
347 |
|
|
* requires an instance
|
348 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
349 |
|
|
* class initialization, which then failed
|
350 |
|
|
* @see #set(Object, Object)
|
351 |
|
|
*/
|
352 |
|
|
native void setBoolean(Object o, boolean value)
|
353 |
|
|
throws IllegalAccessException;
|
354 |
|
|
|
355 |
|
|
/**
|
356 |
|
|
* Set this byte Field. If the field is static, <code>o</code> will be
|
357 |
|
|
* ignored.
|
358 |
|
|
*
|
359 |
|
|
* @param o the object to set this Field on
|
360 |
|
|
* @param value the value to set this Field to
|
361 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
362 |
|
|
* (i.e. it is not public)
|
363 |
|
|
* @throws IllegalArgumentException if this is not a byte, short, int, long,
|
364 |
|
|
* float, or double field, or if <code>o</code> is not an instance
|
365 |
|
|
* of the class declaring this field
|
366 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
367 |
|
|
* requires an instance
|
368 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
369 |
|
|
* class initialization, which then failed
|
370 |
|
|
* @see #set(Object, Object)
|
371 |
|
|
*/
|
372 |
|
|
native void setByte(Object o, byte value)
|
373 |
|
|
throws IllegalAccessException;
|
374 |
|
|
|
375 |
|
|
/**
|
376 |
|
|
* Set this char Field. If the field is static, <code>o</code> will be
|
377 |
|
|
* ignored.
|
378 |
|
|
*
|
379 |
|
|
* @param o the object to set this Field on
|
380 |
|
|
* @param value the value to set this Field to
|
381 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
382 |
|
|
* (i.e. it is not public)
|
383 |
|
|
* @throws IllegalArgumentException if this is not a char, int, long,
|
384 |
|
|
* float, or double field, or if <code>o</code> is not an instance
|
385 |
|
|
* of the class declaring this field
|
386 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
387 |
|
|
* requires an instance
|
388 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
389 |
|
|
* class initialization, which then failed
|
390 |
|
|
* @see #set(Object, Object)
|
391 |
|
|
*/
|
392 |
|
|
native void setChar(Object o, char value)
|
393 |
|
|
throws IllegalAccessException;
|
394 |
|
|
|
395 |
|
|
/**
|
396 |
|
|
* Set this short Field. If the field is static, <code>o</code> will be
|
397 |
|
|
* ignored.
|
398 |
|
|
*
|
399 |
|
|
* @param o the object to set this Field on
|
400 |
|
|
* @param value the value to set this Field to
|
401 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
402 |
|
|
* (i.e. it is not public)
|
403 |
|
|
* @throws IllegalArgumentException if this is not a short, int, long,
|
404 |
|
|
* float, or double field, or if <code>o</code> is not an instance
|
405 |
|
|
* of the class declaring this field
|
406 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
407 |
|
|
* requires an instance
|
408 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
409 |
|
|
* class initialization, which then failed
|
410 |
|
|
* @see #set(Object, Object)
|
411 |
|
|
*/
|
412 |
|
|
native void setShort(Object o, short value)
|
413 |
|
|
throws IllegalAccessException;
|
414 |
|
|
|
415 |
|
|
/**
|
416 |
|
|
* Set this int Field. If the field is static, <code>o</code> will be
|
417 |
|
|
* ignored.
|
418 |
|
|
*
|
419 |
|
|
* @param o the object to set this Field on
|
420 |
|
|
* @param value the value to set this Field to
|
421 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
422 |
|
|
* (i.e. it is not public)
|
423 |
|
|
* @throws IllegalArgumentException if this is not an int, long, float, or
|
424 |
|
|
* double field, or if <code>o</code> is not an instance of the
|
425 |
|
|
* class declaring this field
|
426 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
427 |
|
|
* requires an instance
|
428 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
429 |
|
|
* class initialization, which then failed
|
430 |
|
|
* @see #set(Object, Object)
|
431 |
|
|
*/
|
432 |
|
|
native void setInt(Object o, int value)
|
433 |
|
|
throws IllegalAccessException;
|
434 |
|
|
|
435 |
|
|
/**
|
436 |
|
|
* Set this long Field. If the field is static, <code>o</code> will be
|
437 |
|
|
* ignored.
|
438 |
|
|
*
|
439 |
|
|
* @param o the object to set this Field on
|
440 |
|
|
* @param value the value to set this Field to
|
441 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
442 |
|
|
* (i.e. it is not public)
|
443 |
|
|
* @throws IllegalArgumentException if this is not a long, float, or double
|
444 |
|
|
* field, or if <code>o</code> is not an instance of the class
|
445 |
|
|
* declaring this field
|
446 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
447 |
|
|
* requires an instance
|
448 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
449 |
|
|
* class initialization, which then failed
|
450 |
|
|
* @see #set(Object, Object)
|
451 |
|
|
*/
|
452 |
|
|
native void setLong(Object o, long value)
|
453 |
|
|
throws IllegalAccessException;
|
454 |
|
|
|
455 |
|
|
/**
|
456 |
|
|
* Set this float Field. If the field is static, <code>o</code> will be
|
457 |
|
|
* ignored.
|
458 |
|
|
*
|
459 |
|
|
* @param o the object to set this Field on
|
460 |
|
|
* @param value the value to set this Field to
|
461 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
462 |
|
|
* (i.e. it is not public)
|
463 |
|
|
* @throws IllegalArgumentException if this is not a float or long field, or
|
464 |
|
|
* if <code>o</code> is not an instance of the class declaring this
|
465 |
|
|
* field
|
466 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
467 |
|
|
* requires an instance
|
468 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
469 |
|
|
* class initialization, which then failed
|
470 |
|
|
* @see #set(Object, Object)
|
471 |
|
|
*/
|
472 |
|
|
native void setFloat(Object o, float value)
|
473 |
|
|
throws IllegalAccessException;
|
474 |
|
|
|
475 |
|
|
/**
|
476 |
|
|
* Set this double Field. If the field is static, <code>o</code> will be
|
477 |
|
|
* ignored.
|
478 |
|
|
*
|
479 |
|
|
* @param o the object to set this Field on
|
480 |
|
|
* @param value the value to set this Field to
|
481 |
|
|
* @throws IllegalAccessException if you could not normally access this field
|
482 |
|
|
* (i.e. it is not public)
|
483 |
|
|
* @throws IllegalArgumentException if this is not a double field, or if
|
484 |
|
|
* <code>o</code> is not an instance of the class declaring this
|
485 |
|
|
* field
|
486 |
|
|
* @throws NullPointerException if <code>o</code> is null and this field
|
487 |
|
|
* requires an instance
|
488 |
|
|
* @throws ExceptionInInitializerError if accessing a static field triggered
|
489 |
|
|
* class initialization, which then failed
|
490 |
|
|
* @see #set(Object, Object)
|
491 |
|
|
*/
|
492 |
|
|
native void setDouble(Object o, double value)
|
493 |
|
|
throws IllegalAccessException;
|
494 |
|
|
|
495 |
|
|
/**
|
496 |
|
|
* Return the String in the Signature attribute for this field. If there
|
497 |
|
|
* is no Signature attribute, return null.
|
498 |
|
|
*
|
499 |
|
|
*/
|
500 |
|
|
native String getSignature();
|
501 |
|
|
|
502 |
|
|
/**
|
503 |
|
|
* Compare two objects to see if they are semantically equivalent.
|
504 |
|
|
* Two Fields are semantically equivalent if they have the same declaring
|
505 |
|
|
* class, name, and type. Since you can't create a Field except through
|
506 |
|
|
* the VM, this is just the == relation.
|
507 |
|
|
*
|
508 |
|
|
* @param o the object to compare to
|
509 |
|
|
* @return <code>true</code> if they are equal; <code>false</code> if not
|
510 |
|
|
*/
|
511 |
|
|
public boolean equals(Object o)
|
512 |
|
|
{
|
513 |
|
|
if (!(o instanceof Field))
|
514 |
|
|
return false;
|
515 |
|
|
Field that = (Field)o;
|
516 |
|
|
if (clazz != that.getDeclaringClass())
|
517 |
|
|
return false;
|
518 |
|
|
if (!name.equals(that.getName()))
|
519 |
|
|
return false;
|
520 |
|
|
if (getType() != that.getType())
|
521 |
|
|
return false;
|
522 |
|
|
return true;
|
523 |
|
|
}
|
524 |
|
|
|
525 |
|
|
/**
|
526 |
|
|
* Returns the element's annotation for the specified annotation type,
|
527 |
|
|
* or <code>null</code> if no such annotation exists.
|
528 |
|
|
*
|
529 |
|
|
* @param annotationClass the type of annotation to look for.
|
530 |
|
|
* @return this element's annotation for the specified type, or
|
531 |
|
|
* <code>null</code> if no such annotation exists.
|
532 |
|
|
* @throws NullPointerException if the annotation class is <code>null</code>.
|
533 |
|
|
*/
|
534 |
|
|
native Annotation getAnnotation(Class annotationClass);
|
535 |
|
|
|
536 |
|
|
/**
|
537 |
|
|
* Returns all annotations directly defined by the element. If there are
|
538 |
|
|
* no annotations directly associated with the element, then a zero-length
|
539 |
|
|
* array will be returned. The returned array may be modified by the client
|
540 |
|
|
* code, but this will have no effect on the annotation content of this
|
541 |
|
|
* class, and hence no effect on the return value of this method for
|
542 |
|
|
* future callers.
|
543 |
|
|
*
|
544 |
|
|
* @return the annotations directly defined by the element.
|
545 |
|
|
* @since 1.5
|
546 |
|
|
*/
|
547 |
|
|
native Annotation[] getDeclaredAnnotations();
|
548 |
|
|
|
549 |
|
|
}
|