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.SerializableException;
/**
* 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 SerializableException
*/
public abstract void retrieveAssetContent(RuleAsset asset,
PackageItem pkg,
AssetItem item) throws SerializableException;
/**
* For storing the asset content back into the repo node (any changes).
* @param asset
* @param repoAsset
* @throws SerializableException
*/
public abstract void storeAssetContent(RuleAsset asset,
AssetItem repoAsset) throws SerializableException;
/**
* @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;
}
}
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