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/*
 * $Id: AsyncFieldAccess.java 3dc4372ce40b 2014-09-10 [email protected] $
 * 
 * This file is part of the Object Modeling System (OMS),
 * 2007-2012, Olaf David and others, Colorado State University.
 *
 * OMS 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, version 2.1.
 *
 * OMS 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 OMS.  If not, see .
 */
package oms3;

import java.lang.reflect.Field;

/** Field Access.
 * 
 * @author od  
 *   
 */
class AsyncFieldAccess implements Access {

    Access fa;

    AsyncFieldAccess(Access fa) {
        this.fa = fa;
    }

    /**
     * Checks if this object is in a valid state.
     * @return
     */
    @Override
    public boolean isValid() {
        return fa.isValid();
    }

    /** 
     * a field is receiving a new value (in)
     * 
     * @throws java.lang.Exception
     */
    @Override
    public void in() throws Exception {
        if (fa.getData() == null) {
            throw new ComponentException("Not connected: " + toString());
        }
        // async call
        Object val = fa.getData().getShadow();
        fa.setFieldValue(val);
    }

    /** 
     * a field is sending a new value (out)
     * 
     * @throws java.lang.Exception
     */
    @Override
    public void out() throws Exception {
        Object val = fa.getFieldValue();

        // if data==null this unconsumed @Out, its OK but we do not want to set it.
        if (fa.getData() != null) {
            fa.getData().setValue0(val);
        }
        fa.out();
    }

    /** Get the command belonging to this Object
     *
     * @return the command object
     */
    @Override
    public Object getComponent() {
        return fa.getComponent();
    }

    /**
     * Get the Field
     * @return the field object.
     */
    @Override
    public Field getField() {
        return fa.getField();
    }

    @Override
    public String toString() {
        return "AsyncFieldAccess [" + fa.toString() + "]";
    }

     @Override
    public Object getFieldValue() throws Exception {
        return fa.getFieldValue();
    }

    @Override
    public void setFieldValue(Object o) throws Exception {
        fa.setFieldValue(o);
    }

    @Override
    public FieldContent getData() {
        return fa.getData();
    }

    @Override
    public void setData(FieldContent data) {
        fa.setData(data);
    }
}