/**
* 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.server.contenthandler;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.drools.compiler.DrlParser;
import org.drools.compiler.DroolsParserException;
import org.drools.guvnor.client.factmodel.FactMetaModel;
import org.drools.guvnor.client.factmodel.FactModels;
import org.drools.guvnor.client.factmodel.FieldMetaModel;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.guvnor.client.rpc.RuleContentText;
import org.drools.lang.descr.PackageDescr;
import org.drools.lang.descr.TypeDeclarationDescr;
import org.drools.lang.descr.TypeFieldDescr;
import org.drools.repository.AssetItem;
import org.drools.repository.PackageItem;
import com.google.gwt.user.client.rpc.SerializationException;
public class FactModelContentHandler extends ContentHandler {
@Override
public void retrieveAssetContent(RuleAsset asset, PackageItem pkg,
AssetItem item) throws SerializationException {
try {
List<FactMetaModel> models = toModel(item.getContent());
FactModels ms = new FactModels();
ms.models = models;
asset.content = ms;
} catch (DroolsParserException e) {
System.err.println("Unable to parse the DRL for the model - falling back to text (" + e.getMessage() + ")");
RuleContentText text = new RuleContentText();
text.content = item.getContent();
asset.content = text;
}
}
@Override
public void storeAssetContent(RuleAsset asset, AssetItem repoAsset)
throws SerializationException {
if (asset.content instanceof FactModels) {
FactModels fm = (FactModels) asset.content;
repoAsset.updateContent(toDRL(fm.models));
} else {
RuleContentText text = (RuleContentText) asset.content;
repoAsset.updateContent(text.content);
}
}
String toDRL(FactMetaModel mm) {
StringBuilder sb = new StringBuilder();
sb.append("declare " + mm.name);
for (int i = 0; i < mm.fields.size(); i++) {
FieldMetaModel f = (FieldMetaModel) mm.fields.get(i);
sb.append("\n\t");
sb.append(f.name + ": " + f.type);
}
sb.append("\nend");
return sb.toString();
}
List<FactMetaModel> toModel(String drl) throws DroolsParserException {
if (drl != null && drl.startsWith("#advanced")) {
throw new DroolsParserException("Using advanced editor");
}
DrlParser parser = new DrlParser();
PackageDescr pkg = parser.parse(drl);
if (parser.hasErrors()) {
throw new DroolsParserException("The model drl " + drl + " is not valid");
}
if (pkg == null) return new ArrayList<FactMetaModel>();
List<TypeDeclarationDescr> types = pkg.getTypeDeclarations();
List<FactMetaModel> list = new ArrayList<FactMetaModel>(types.size());
for (TypeDeclarationDescr td : types) {
FactMetaModel mm = new FactMetaModel();
mm.name = td.getTypeName();
if (td.getMetaAttributes().size() > 0) {
//can't do this yet
throw new DroolsParserException("will have to use text for this");
}
Map<String, TypeFieldDescr> fields = td.getFields();
for (Iterator<Map.Entry<String, TypeFieldDescr>> iterator = fields.entrySet().iterator(); iterator.hasNext();) {
Map.Entry<String, TypeFieldDescr> en = iterator.next();
String fieldName = en.getKey();
TypeFieldDescr descr = en.getValue();
if (descr.getMetaAttributes().size() > 0) {
//can't do this yet
throw new DroolsParserException("using text");
}
FieldMetaModel fm = new FieldMetaModel(fieldName, descr.getPattern().getObjectType());
mm.fields.add(fm);
}
list.add(mm);
}
return list;
}
String toDRL(List<FactMetaModel> models) {
StringBuilder sb = new StringBuilder();
for (FactMetaModel factMetaModel : models) {
String drl = toDRL(factMetaModel);
sb.append(drl + "\n\n");
}
return sb.toString().trim();
}
}