AbstractMWClassRefreshPolicy.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.mappingsmodel.meta;

import java.util.Collection;

import org.eclipse.persistence.tools.workbench.mappingsmodel.spi.meta.ExternalField;
import org.eclipse.persistence.tools.workbench.utility.CollectionTools;


public abstract class AbstractMWClassRefreshPolicy
    implements MWClassRefreshPolicy
{
    protected AbstractMWClassRefreshPolicy()
    {
        super();
    }

    public void refreshAttributes(MWClass mwClass, ExternalField[] externalFields)
    {
        // after we have looped through the Java fields,
        // 'removedAttributes' will be left with the attributes that need to be removed
        Collection missingAttributes = CollectionTools.collection(mwClass.attributes());
        for (int i = 0; i < externalFields.length; i++) {
            this.refreshAttribute(mwClass, externalFields[i], missingAttributes);
        }
        this.resolveMissingAttributes(mwClass, missingAttributes);
    }

    private void refreshAttribute(MWClass mwClass, ExternalField externalField, Collection missingAttributes) {
        if (externalField.isSynthetic()) {
            return;    // we are not interested in compiler-generated fields
        }
        MWClassAttribute existingAttribute = mwClass.attributeNamed(externalField.getName());
        if (existingAttribute == null) {
            // we have a new attribute
            mwClass.addAttribute(externalField);
        } else {
            // we need to refresh the existing attribute
            existingAttribute.refresh(externalField);
            missingAttributes.remove(existingAttribute);
        }
    }

    protected abstract void resolveMissingAttributes(MWClass mwClass, Collection missingAttributes);
}