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78 lines (71 loc) · 2.79 KB
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/*
* Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.program.option;
import com.sun.max.*;
import com.sun.max.program.ProgramError;
import java.lang.reflect.Field;
/**
* This class implements a command line option that stores its value in a field
* via reflection.
*
* @author Ben L. Titzer
*/
public class FieldOption<T> extends Option<T> {
protected final Object object;
protected final Field field;
protected T nullValue;
public FieldOption(String name, Object object, Field field, T defaultValue, Type<T> type, String help) {
super(name, defaultValue, type, help);
this.object = object;
this.field = field;
this.nullValue = defaultValue;
}
/**
* Gets the value of this option. This implementation stores the field's value in a reflected field
* and access requires a reflective access.
* @return the value of this option
*/
@Override
public T getValue() {
try {
return Utils.<T>cast(field.get(object));
} catch (IllegalAccessException e) {
throw ProgramError.unexpected(e);
}
}
/**
* Sets the value of this option. This implementation stores the field's value in a reflected field
* and thus setting the value requires a reflective access.
* @param value the value to set the new value to
*/
@Override
public void setValue(T value) {
try {
if (value == null) {
field.set(object, nullValue);
} else {
field.set(object, value);
}
} catch (Exception e) {
throw ProgramError.unexpected("Error updating the value of " + field, e);
}
}
}