Mercurial > hg > truffle
view graal/com.oracle.max.base/src/com/sun/max/program/option/FieldOption.java @ 4186:71a2cd79c375
Made stdout for mx unbuffered.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 13:53:38 +0100 |
parents | e233f5660da4 |
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/* * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ 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. */ 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); } } }