jboss规则引擎

				package org.drools.decisiontable.model;
				
				/*
				 * 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.Iterator;
				import java.util.LinkedList;
				import java.util.List;
				
				/**
				 * @author  Michael Neale 
				 * 
				 * This is the top of the parse tree. Represents a package of rules once it has
				 * been parsed from the spreadsheet. Also is the launching point for dumping out
				 * the DRL.
				 */
				public class Package
				    implements
				    DRLJavaEmitter {
				
				    private String    _name;
				
				    private List      _imports;
				
				    private List      _variables; // List of the application data Variable Objects
				
				    private List      _rules;
				
				    private Functions _functions;
				
				    public Package(final String name) {
				        this._name = name;
				        this._imports = new LinkedList();
				        this._variables = new LinkedList();
				        this._rules = new LinkedList();
				        this._functions = new Functions();
				    }
				
				    public void addImport(final Import imp) {
				        this._imports.add( imp );
				    }
				
				    public void addVariable(final Global varz) {
				        this._variables.add( varz );
				    }
				
				    public void addRule(final Rule rule) {
				        this._rules.add( rule );
				    }
				
				    public void addFunctions(final String listing) {
				        this._functions.setFunctionsListing( listing );
				    }
				
				    public String getName() {
				        return this._name;
				    }
				
				    public List getImports() {
				        return this._imports;
				    }
				
				    public List getVariables() {
				        return this._variables;
				    }
				
				    public List getRules() {
				        return this._rules;
				    }
				
				    public void renderDRL(final DRLOutput out) {
				        out.writeLine( "package " + this._name.replace( ' ',
				                                                   '_' ) + ";" );
				        out.writeLine( "#generated from Decision Table" );
				        renderDRL( this._imports,
				                   out );
				        renderDRL( this._variables,
				                   out );
				        this._functions.renderDRL( out );
				        renderDRL( this._rules,
				                   out );
				
				    }
				
				    private void renderDRL(final List list,
				                           final DRLOutput out) {
				        for ( final Iterator it = list.iterator(); it.hasNext(); ) {
				            final DRLJavaEmitter emitter = (DRLJavaEmitter) it.next();
				            emitter.renderDRL( out );
				        }
				    }
				
				}