/*
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.guvnor.client.factmodel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.drools.guvnor.client.common.AssetFormats;
import org.drools.guvnor.client.common.GenericCallback;
import org.drools.guvnor.client.common.LoadingPopup;
import org.drools.guvnor.client.explorer.ClientFactory;
import org.drools.guvnor.client.messages.Constants;
import org.drools.guvnor.client.packages.SuggestionCompletionCache;
import org.drools.guvnor.client.rpc.AssetPageRequest;
import org.drools.guvnor.client.rpc.AssetPageRow;
import org.drools.guvnor.client.rpc.PageResponse;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.guvnor.client.rpc.RuleContentText;
import org.drools.guvnor.client.ruleeditor.DefaultRuleContentWidget;
import org.drools.guvnor.client.ruleeditor.EditorWidget;
import org.drools.guvnor.client.ruleeditor.RuleViewer;
import org.drools.guvnor.client.ruleeditor.SaveEventListener;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;
/**
* The editor for fact models (DRL declared types).
*/
public class FactModelsWidget extends Composite
implements
SaveEventListener,
EditorWidget {
private static final Constants constants = ((Constants) GWT.create( Constants.class ));
private final RuleAsset asset;
private final ClientFactory clientFactory;
//These are passed up to FactEditorPopup to provide the list of types from which to extend and provide
//validation services. They are populated asynchronously from 'populateSuperTypesFactModels' that calls
//back to the server to retrieve a list of all Declared Facts in the package.
private final List<FactMetaModel> superTypeFactModels = new ArrayList<FactMetaModel>();
private final ModelNameHelper modelNameHelper = new ModelNameHelper();
//While the necessary model information is loading the screen is initialised to an
//empty container. The container is populated with the actual screen widget once the
//necessary model information has been loaded.
private final SimplePanel editorContainer = new SimplePanel();
public FactModelsWidget(final RuleAsset asset,
final RuleViewer viewer,
final ClientFactory clientFactory,
final EventBus eventBus) {
this.asset = asset;
this.clientFactory = clientFactory;
if ( isContentPlainText() ) {
initWidget( getPlainTextEditor() );
} else {
initWidget( editorContainer );
initFactModelsEditor();
}
setWidth( "100%" );
setStyleName( "model-builder-Background" );
}
private boolean isContentPlainText() {
return asset.getContent() instanceof RuleContentText;
}
private Widget getPlainTextEditor() {
return new DefaultRuleContentWidget( asset );
}
private void initFactModelsEditor() {
if ( asset.getContent() == null ) {
asset.setContent( new FactModels() );
}
populateSuperTypesFactModels();
}
//Load all Declarative Model assets in the package
private void populateSuperTypesFactModels() {
String containingModuleUUID = asset.getMetaData().getPackageUUID();
List<String> formats = Arrays.asList( new String[]{AssetFormats.DRL_MODEL} );
AssetPageRequest request = new AssetPageRequest( containingModuleUUID,
formats,
null );
clientFactory.getAssetService().findAssetPage( request,
makeLoadAssetsCallback() );
}
//Load all Facts in a Declarative Model asset
private GenericCallback<PageResponse<AssetPageRow>> makeLoadAssetsCallback() {
return new GenericCallback<PageResponse<AssetPageRow>>() {
//We have a list of Declarative Models
public void onSuccess(PageResponse<AssetPageRow> result) {
loadFactModelAssets( result.getPageRowList() );
}
//Iterate list of Declarative Models, loading each model and adding types to complete list
private void loadFactModelAssets(List<AssetPageRow> assets) {
//Load the fact being edited
loadFacts( asset );
//Don't load Facts for the Asset being edited as we want the same
//objects instances to detect for circular dependencies.
final FactModelsSemaphore s = new FactModelsSemaphore( assets.size() - 1 );
//If there are no models show the editor
if ( s.areAllFactModelsProcessed() ) {
addEditorToContainer();
} else {
for ( AssetPageRow otherAsset : assets ) {
if ( !otherAsset.getUuid().equals( asset.getUuid() ) ) {
clientFactory.getAssetService().loadRuleAsset( otherAsset.getUuid(),
makeLoadFactModelsCallback( s ) );
}
}
}
}
};
}
//Add all Facts in a Declarative Model to the complete (cross-package) collection
private GenericCallback<RuleAsset> makeLoadFactModelsCallback(final FactModelsSemaphore s) {
return new GenericCallback<RuleAsset>() {
public void onSuccess(RuleAsset otherAsset) {
loadFacts( otherAsset );
//When all Fact Models have been loaded show the editor
s.recordFactModelProcessed();
if ( s.areAllFactModelsProcessed() ) {
addEditorToContainer();
}
}
};
}
private void addEditorToContainer() {
FactModelsEditor editor = new FactModelsEditor( ((FactModels) asset.getContent()).models,
superTypeFactModels,
modelNameHelper );
editorContainer.setWidget( editor );
}
//Load Facts for a given asset
private void loadFacts(RuleAsset asset) {
if ( asset.getContent() == null ) {
asset.setContent( new FactModels() );
}
FactModels factModels = ((FactModels) asset.getContent());
for ( FactMetaModel factMetaModel : factModels.models ) {
superTypeFactModels.add( factMetaModel );
modelNameHelper.getTypeDescriptions().put( factMetaModel.getName(),
factMetaModel.getName() );
}
}
//A container for the number of Fact Models to be added to the editor. Each Fact
//Model is loaded with asynchronous GWT-RPC calls. Since we cannot control when the
//responses are received we keep a running total of the number of Fact Models so
//the UI can be created after all have been loaded
private static class FactModelsSemaphore {
int numberOfFactModels = 0;
FactModelsSemaphore(int numberOfFactModels) {
this.numberOfFactModels = numberOfFactModels;
}
synchronized void recordFactModelProcessed() {
numberOfFactModels--;
}
synchronized boolean areAllFactModelsProcessed() {
return this.numberOfFactModels == 0;
}
}
public void onAfterSave() {
//Refresh SuggestionCompletionCache is done by RuleViewer.flushSuggestionCompletionCache(). No need to refresh it twice here.
/* LoadingPopup.showMessage( constants.RefreshingModel() );
SuggestionCompletionCache.getInstance().loadPackage( this.asset.getMetaData().getPackageName(),
new Command() {
public void execute() {
LoadingPopup.close();
}
} );*/
}
public void onSave() {
//not needed.
}
}