/**
* 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;
/*
* Copyright 2005 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.
*/
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.repository.AssetItem;
import org.drools.repository.CategoryItem;
import org.drools.repository.PackageItem;
import com.google.gwt.user.client.rpc.SerializationException;
/**
* All content handlers must implement this, and be registered in content_types.properties
* @author Michael Neale
*
*/
public abstract class ContentHandler {
/**
* When loading asset content.
* @param asset The target.
* @param item The source.
* @throws SerializationException
*/
public abstract void retrieveAssetContent(RuleAsset asset,
PackageItem pkg,
AssetItem item) throws SerializationException;
/**
* For storing the asset content back into the repo node (any changes).
* @param asset
* @param repoAsset
* @throws SerializationException
*/
public abstract void storeAssetContent(RuleAsset asset,
AssetItem repoAsset) throws SerializationException;
/**
* @return true if the current content type is for a rule asset.
* If it is a rule asset, then it can be assembled into a package.
* If its not, then it is there, nominally to support compiling or
* validation/testing of the package (eg a model, or a dsl file).
*/
public boolean isRuleAsset() {
return this instanceof IRuleAsset;
}
private String findParentCategory(AssetItem asset,
String currentCat) {
//Start your search at the top
CategoryItem item = asset.getRulesRepository().loadCategory( "/" );
return findCategoryInChild( item,
currentCat );
}
private String findCategoryInChild(CategoryItem item,
String currentCat) {
List children = item.getChildTags();
for ( int i = 0; i < children.size(); i++ ) {
if ( ((CategoryItem) children.get( i )).getName().equals( currentCat ) ) {
return item.getName();
} else {
String check = findCategoryInChild( (CategoryItem) children.get( i ),
currentCat );
if ( check != null && check.length() > 0 ) {
return check;
}
}
}
return "";
}
private String findKeyforValue(HashMap<String, String> catRules,
String catToFind) {
for ( Iterator i = catRules.entrySet().iterator(); i.hasNext(); ) {
Map.Entry entry = (Map.Entry) i.next();
//Found rule name that should be used to extend current rule as defined in the Category Rule
if ( entry.getValue().equals( catToFind ) ) {
return (String) entry.getKey();
}
}
return "";
}
/**
* Search Categories in a package against the current rule to see if the current rule should be extended,
* via another rule. IE rule rule1 extends rule2
* This is an implementation of that DRL feature, via Category to Rule mappings in Guvnor
* @param asset
* @return rule that should be extended, based on categories
*/
protected String parentNameFromCategory(AssetItem asset,
String currentParent) {
List<CategoryItem> cats = asset.getCategories();
String catName = null;
String parentCat = null;
if ( cats.size() > 0 ) {
// for(int i=0;i< cats.size(); i++){
// System.out.println(i+" Cat: "+((CategoryItem)(cats.get(i))).getName());
// System.out.println(i+" Path: "+((CategoryItem)(cats.get(i))).getFullPath());
//
// }
catName = cats.get( 0 ).getName();
}
//get all Category Rules for Package
HashMap<String, String> catRules = asset.getPackage().getCategoryRules();
String newParent = currentParent;
if ( null != catRules && null != catName ) {
//Asset or Rule is actually used in the Category Rule, so ignore the category of the normal rule
//Either extend from the parent category rule or none at all
String ruleName = asset.getName();
if ( catRules.containsKey( ruleName ) ) {
//find Cat for your rule
parentCat = findParentCategory( asset,
catRules.get( ruleName ) );
// System.out.println("Found rule: " + ruleName + " in categoryRuleHash, Parent Cat: " + parentCat);
//This rule name is in our Category Rules
//See if there is a Parent and it has a rule defined, if so extend that rule, to create a chain
if ( parentCat != null && parentCat.length() > 0 && catRules.containsValue( parentCat ) ) {
// System.out.println("Should have rule in Category to use for my Parent");
newParent = findKeyforValue( catRules,
parentCat );
} else {
//Must be blank to avoid circular reference
newParent = "";
}
//else make sure parent is ALWAYS blank, to avoid circle references
//If the rule is not defined in the Category Rule, check to make sure currentParent isnt already set
//If you wanted to override the Category Rule, with a extends on the rule manually, honor it
} else if ( currentParent != null && currentParent.length() > 0 ) {
newParent = currentParent;
//Normal use case
//Category of the current asset has been defined in Category Rules for the current package
} else if ( catRules.containsValue( catName ) ) {
newParent = findKeyforValue( catRules,
catName );
}
}
return newParent;
}
}