ComhandleFieldRef.java
/*
** Module : ComhandleFieldRef.java
** Abstract : Data wrapper which associates with a DMO property and provides direct access to
** this property.
**
** Copyright (c) 2018-2020, Golden Code Development Corporation.
**
** -#- -I- --Date-- ---------------------------------Description----------------------------------
** 001 CA 20180511 Created initial version.
** 002 OM 20200325 Moved to com.goldencode.p2j.util package.
*/
/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program 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 Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
**
** Additional terms under GNU Affero GPL version 3 section 7:
**
** Under Section 7 of the GNU Affero GPL version 3, the following additional
** terms apply to the works covered under the License. These additional terms
** are non-permissive additional terms allowed under Section 7 of the GNU
** Affero GPL version 3 and may not be removed by you.
**
** 0. Attribution Requirement.
**
** You must preserve all legal notices or author attributions in the covered
** work or Appropriate Legal Notices displayed by works containing the covered
** work. You may not remove from the covered work any author or developer
** credit already included within the covered work.
**
** 1. No License To Use Trademarks.
**
** This license does not grant any license or rights to use the trademarks
** Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
** of Golden Code Development Corporation. You are not authorized to use the
** name Golden Code, FWD, or the names of any author or contributor, for
** publicity purposes without written authorization.
**
** 2. No Misrepresentation of Affiliation.
**
** You may not represent yourself as Golden Code Development Corporation or FWD.
**
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** Golden Code Development Corporation, FWD, or any author or contributor to
** the covered work, without written authorization.
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** 3. No Misrepresentation of Source or Origin.
**
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** versions of the covered work must be marked in a reasonable way to make it
** clear that the modified work is not originating from Golden Code Development
** Corporation or FWD. All modified versions must contain the notices of
** attribution required in this license.
*/
package com.goldencode.p2j.util;
import com.goldencode.p2j.comauto.ComObject;
import com.goldencode.p2j.persist.*;
/**
* Data wrapper which associates with a DMO property and provides direct access to this property.
* <p>
* All writing is done to both the DMO and the local {@link comhandle}'s private {@code value}.
* On instantiation, the current field value is saved in the {@link comhandle}'s private
* {@code value}, and this instance will be used for reading until {@link #assign} or
* {@link #setUnknown} is called again.
* <p>
* This usage is OK
*/
public class ComhandleFieldRef
extends comhandle
{
/** The field referenced by this instance. */
private final FieldReference fieldRef;
/**
* Constructor.
*
* @param dmo
* Proxy for record whose field is being accessed.
* @param property
* Name of dmo field.
*/
public ComhandleFieldRef(DataModelObject dmo, String property)
{
this.fieldRef = new FieldReference(dmo, property);
RecordBuffer rb = ((BufferReference) dmo).buffer();
// initialize this instance based on the current buffer state; if no record is loaded in the
// buffer, then set it to unknown. there will be a 142 - Unable to update field error raised
// when we try to assign a new value to this instance.
if (rb.getCurrentRecord() != null)
{
super.assign(((comhandle) fieldRef.get()).getResource());
}
else
{
super.setUnknown();
}
}
/**
* Modify the contained data of the instance to copy the instance data from the given instance.
* Generally, the class of the given instance must match the class upon which the
* {@code assign} method is called, although this is not a strict requirement.
* <p>
* Also updates the {@link #fieldRef} with the new state of this comhandle instance.
*
* @param value
* The backup instance from which to copy data.
*/
@Override
public void assign(Undoable value)
{
super.assign(value);
fieldRef.set(this);
}
/**
* Dedicated assignment method for loading a {@code ComObject} into this {@code comhandle}.
* This method is only called by {@link com.goldencode.p2j.comauto.ComServer#create}. Stores
* a newly created {@code ComObject} into this handle.
* <p>
* Also updates the {@link #fieldRef} with the new state of this comhandle instance.
*
* @param newVal
* The new value to be stored by this handle.
*/
@Override
public void assign(ComObject newVal)
{
super.assign(newVal);
fieldRef.set(this);
}
/**
* Sets the state (data and unknown value) of this instance based on the state of the passed
* instance.
* <p>
* Also updates the {@link #fieldRef} with the new state of this comhandle instance.
*
* @param value
* The instance from which to copy state.
*/
@Override
public void assign(BaseDataType value)
{
super.assign(value);
fieldRef.set(this);
}
/**
* Sets the state of this instance's {@code unknown value} flag or state to {@code true}.
* <p>
* <b>Warning: the data stored in this instance may be invalid after calling this method.</b>
* <p>
* Also updates the {@link #fieldRef} with the new state of this comhandle instance.
*/
public void setUnknown()
{
super.setUnknown();
fieldRef.set(this);
}
}