/*
 * Copyright (c) 2007, 2012, 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.tele.field;

import com.sun.max.tele.util.*;
import com.sun.max.vm.actor.member.*;
import com.sun.max.vm.type.*;

/**
 * An accessor for reading object fields, either instances or static, from VM memory, specified by class and field name.
 */
public abstract class TeleFieldAccess {

    private static FieldActor findFieldActor(Class holder, String name) {
        final FieldActor fieldActor = ClassRegistry.findField(holder, name);
        TeleError.check(fieldActor != null, "could not find field: " + name + " in class: " + holder);
        return fieldActor;
    }

    private final FieldActor fieldActor;

    /**
     * @return the local instance of {@link FieldActor} associated with this field accessor.
     */
    public FieldActor fieldActor() {
        return fieldActor;
    }

    protected TeleFieldAccess(Class holder, String name, Kind kind) {
        fieldActor = findFieldActor(holder, name);
        TeleError.check(fieldActor.kind == kind, "field has wrong kind: " + name + " in class: " + holder);
    }

    @Override
    public String toString() {
        return fieldActor.toString();
    }
}