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/**
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* Copyright (C) 2017 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.vaadin.event;
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import com.vaadin.data.Property.ValueChangeEvent;
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import com.vaadin.data.Property.ValueChangeListener;
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import com.vaadin.ui.Field;
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import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;
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import eu.etaxonomy.cdm.model.ICdmCacher;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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import eu.etaxonomy.cdm.vaadin.view.name.CachingPresenter;
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import eu.etaxonomy.vaadin.component.EntitySupport;
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/**
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* The <code>ToOneRelatedEntityReloader</code> helps avoiding <i>java.lang.IllegalStateException: Multiple representations of the same entity</i>
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* in Hibernate sessions.
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*
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*
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* @author a.kohlbecker
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* @since 19.10.2017
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*
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*/
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public class ToOneRelatedEntityReloader<CDM extends CdmBase> implements ValueChangeListener {
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private static final long serialVersionUID = -1141764783149024788L;
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Field<CDM> toOneRelatedEntityField;
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CachingPresenter cachingPresenter;
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boolean onSettingReloadedEntity;
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public ToOneRelatedEntityReloader( Field<CDM> toOneRelatedEntityField, CachingPresenter entityCache){
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this.toOneRelatedEntityField = toOneRelatedEntityField;
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this.cachingPresenter = entityCache;
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}
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@Override
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public void valueChange(ValueChangeEvent event) {
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// TODO during the view initialization this method is called twice with the same value.
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// for faster view initialization it might make sense to reduce this to only one call.
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// only one call should be sufficient since the same value object is use in both calls
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// whereas i observed that it is a hibernate proxy during the first call,
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// the second time it is the de-proxied entity which was during the first call inside the proxy.
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// Since both cdm enties are the same object
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// a reduction to one call should not break anything, but at least one call during the initialization
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// is required!
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if(onSettingReloadedEntity){
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// avoid potential loops caused by setValue() below
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return;
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}
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@SuppressWarnings("unchecked")
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CDM value = (CDM)event.getProperty().getValue();
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if(value == null || !value.isPersited()) {
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return;
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}
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value = HibernateProxyHelper.deproxy(value);
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ICdmCacher cache = cachingPresenter.getCache();
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if(cache != null){
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CDM cachedEntity = cache.load(value);
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if(// pure object comparison is not reliable since the entity may have been changed
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cachedEntity.getId() == value.getId() && cachedEntity.getClass() == value.getClass()
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){
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onSettingReloadedEntity = true;
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if(EntitySupport.class.isAssignableFrom(toOneRelatedEntityField.getClass())){
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((EntitySupport)toOneRelatedEntityField).replaceEntityValue(cachedEntity);
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} else {
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toOneRelatedEntityField.removeValueChangeListener(this);
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toOneRelatedEntityField.setValue(null); // reset to trick equals check in vaadin
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toOneRelatedEntityField.setValue(cachedEntity);
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toOneRelatedEntityField.addValueChangeListener(this);
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}
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onSettingReloadedEntity = false;
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}
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} else {
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throw new RuntimeException("The cache must not be null. See loadBeanById() in CdmEditorPresenterBase");
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}
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}
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}
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