field.java

一个开源的JAVA虚拟机

/*
    libaegisvm - The Aegis Virtual Machine for executing Java bytecode
    Copyright (C) 2001-2002  Philip W. L. Fong

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

package java.lang.reflect;

public final class Field extends AccessibleObject implements Member {
    private Class declaringClass;    // The VM depends on the object
    private int id;                  // layout of the class.
    private Field(Class declaringClass, int id) {
	this.declaringClass = declaringClass;
	this.id = id;
    }
    public Class getDeclaringClass() {
	return declaringClass;
    }
    public native String getName();
    private native String getDescriptor();
    public native int getModifiers();
    public Class getType() {
	return aegis.Reflect.getFieldType(declaringClass, getDescriptor());
    }
    public boolean equals(Object obj) {
	if (! (obj instanceof Field))
	    return false;
	Field F = (Field) obj;
	return declaringClass == F.declaringClass && id == F.id;
    }
    public int hashCode() {
	return getDeclaringClass().hashCode() ^ getName().hashCode();
    }
    public String toString() {
	return
	    Modifier.toString(getModifiers()) +
	    getType().getName()	+ ' ' +
	    declaringClass.getName() + '.' +
	    getName();
    }
    private static native Object get(Class declaringClass, int id, Object obj);
    /**
     * \todo Accessibility check.
     */
    public Object get(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	if (! Modifier.isStatic(getModifiers())) {
	    if (obj == null)
		throw new NullPointerException();
	    if (! declaringClass.isInstance(obj))
		throw new IllegalArgumentException();
	}
	// Accessibility check goes here
	return get(declaringClass, id, obj);
    }
    public boolean getBoolean(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToBoolean(getType(), get(obj));
    }
    public byte getByte(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToByte(getType(), get(obj));
    }
    public char getChar(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToCharacter(getType(), get(obj));
    }
    public short getShort(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToShort(getType(), get(obj));
    }
    public int getInt(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToInteger(getType(), get(obj));
    }
    public long getLong(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToLong(getType(), get(obj));
    }
    public float getFloat(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToFloat(getType(), get(obj));
    }
    public double getDouble(Object obj)
	throws IllegalArgumentException, IllegalAccessException {
	return aegis.Reflect.widenToDouble(getType(), get(obj));
    }
    private static native void set(Class clazz,
				   int id,
				   Object obj,
				   Object value);
    /**
     * \todo Accessibility check.
     */
    public void set(Object obj, Object value)
	throws IllegalArgumentException, IllegalAccessException {
	if (! Modifier.isStatic(getModifiers())) {
	    if (obj == null)
		throw new NullPointerException();
	    if (! declaringClass.isInstance(obj))
		throw new IllegalArgumentException();
	}
	// Accessibility check goes here
	if (Modifier.isFinal(getModifiers()))
	    throw new IllegalAccessException();
	value = aegis.Reflect.widen(value, getType());
	set(declaringClass, id, obj, value);
    }
    public void setBoolean(Object obj, boolean z)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Boolean(z));
    }
    public void setByte(Object obj, byte b)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Byte(b));
    }
    public void setChar(Object obj, char c)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Character(c));
    }
    public void setShort(Object obj, short s)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Short(s));
    }
    public void setInt(Object obj, int i)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Integer(i));
    }
    public void setLong(Object obj, long l)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Long(l));
    }
    public void setFloat(Object obj, float f)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Float(f));
    }
    public void setDouble(Object obj, double d)
	throws IllegalArgumentException, IllegalAccessException {
	set(obj, new Double(d));
    }
}