/*
* 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.
*/
package org.drools.guvnor.server.contenthandler;
import com.google.gwt.user.client.rpc.SerializationException;
import org.drools.guvnor.client.rpc.Asset;
import org.drools.repository.AssetItem;
import org.drools.repository.CategoryItem;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* All content handlers must implement this, and be registered in content_types.properties
*/
public abstract class ContentHandler {
/**
* When loading asset content.
*
* @param asset The target.
* @param item The source.
* @throws SerializationException
*/
public abstract void retrieveAssetContent(Asset asset,
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(Asset 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);
}
@SuppressWarnings("rawtypes")
private String findCategoryInChild(CategoryItem item,
String currentCat) {
List children = item.getChildTags();
for (Object aChildren : children) {
if (((CategoryItem) aChildren).getName().equals(currentCat)) {
return item.getName();
} else {
String check = findCategoryInChild((CategoryItem) aChildren,
currentCat);
if (check != null && check.length() > 0) {
return check;
}
}
}
return "";
}
@SuppressWarnings("rawtypes")
private String findKeyforValue(HashMap<String, String> catRules,
String catToFind) {
for (Map.Entry<String, String> stringStringEntry : catRules.entrySet()) {
//Found rule name that should be used to extend current rule as defined in the Category Rule
if (stringStringEntry.getValue().equals(catToFind)) {
return (String) stringStringEntry.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;
if (cats.size() > 0) {
catName = cats.get(0).getName();
}
//get all Category Rules for Package
HashMap<String, String> categoryRules = asset.getModule().getCategoryRules();
String newParent = currentParent;
if (null != categoryRules && 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 (categoryRules.containsKey(ruleName)) {
//find Cat for your rule
String parentCategory = findParentCategory(asset,
categoryRules.get(ruleName));
//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 (parentCategory != null && parentCategory.length() > 0 && categoryRules.containsValue(parentCategory)) {
newParent = findKeyforValue(categoryRules,
parentCategory);
} 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 (categoryRules.containsValue(catName)) {
newParent = findKeyforValue(categoryRules,
catName);
}
}
return newParent;
}
}