content: /**
   * ﻿Copyright (C) 2007 - 2019 52°North Initiative for Geospatial Open Source
   * Software GmbH
   *
   * 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.n52.wps.server;
  
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  
  import net.opengis.wps.x100.ProcessDescriptionType;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.n52.wps.PropertyDocument.Property;
  import org.n52.wps.algorithm.annotation.Algorithm;
  import org.n52.wps.commons.WPSConfig;
  
  
  
  /**
   * A static repository to retrieve the available algorithms.
   * @author foerster
   *
   */
  public class LocalAlgorithmRepository implements ITransactionalAlgorithmRepository{
  	
  	private static Logger LOGGER = LoggerFactory.getLogger(LocalAlgorithmRepository.class);
  	private Map<String, String> algorithmMap;
  	private Map<String, ProcessDescriptionType> processDescriptionMap;
  	
  	public LocalAlgorithmRepository() {
  		algorithmMap = new HashMap<String, String>();
  		processDescriptionMap = new HashMap<String, ProcessDescriptionType>(); 
  		
  		// check if the repository is active
  		if(WPSConfig.getInstance().isRepositoryActive(this.getClass().getCanonicalName())){
  			Property[] propertyArray = WPSConfig.getInstance().getPropertiesForRepositoryClass(this.getClass().getCanonicalName());
  			for(Property property : propertyArray){
  				// check the name and active state
  				if(property.getName().equalsIgnoreCase("Algorithm") && property.getActive()){
  					addAlgorithm(property.getStringValue());
  				}
  			}
  		} else {
  			LOGGER.debug("Local Algorithm Repository is inactive.");
  		}
  	}
  	
  	public boolean addAlgorithms(String[] algorithms)  {
  		for(String algorithmClassName : algorithms) {
  			addAlgorithm(algorithmClassName);
  		}
  		LOGGER.info("Algorithms registered!");
  		return true;
  		
  	}
  	
  	public IAlgorithm getAlgorithm(String className) {
  		try {
  			return loadAlgorithm(algorithmMap.get(className));
  		} catch (Exception e) {
  			e.printStackTrace();
  			return null;
  		}
  	}
  	
  	public Collection<String> getAlgorithmNames() {
  		return new ArrayList<String>(algorithmMap.keySet());
  	}
  	
  	public boolean containsAlgorithm(String className) {
  		return algorithmMap.containsKey(className);
  	}
  	
  	private IAlgorithm loadAlgorithm(String algorithmClassName) throws Exception {
          Class<?> algorithmClass = LocalAlgorithmRepository.class.getClassLoader().loadClass(algorithmClassName);
          IAlgorithm algorithm = null;
          if (IAlgorithm.class.isAssignableFrom(algorithmClass)) {
              algorithm = IAlgorithm.class.cast(algorithmClass.newInstance());
          } else if (algorithmClass.isAnnotationPresent(Algorithm.class)) {
              // we have an annotated algorithm that doesn't implement IAlgorithm
              // wrap it in a proxy class
              algorithm = new AbstractAnnotatedAlgorithm.Proxy(algorithmClass);
          }
          else {
              throw new Exception("Could not load algorithm " + algorithmClassName + " does not implement IAlgorithm or have a Algorithm annotation.");
          }
  		
  		if(!algorithm.processDescriptionIsValid()) {
  			LOGGER.warn("Algorithm description is not valid: " + algorithmClassName);
  			throw new Exception("Could not load algorithm " +algorithmClassName +". ProcessDescription Not Valid.");
  		}
  		return algorithm;
  	}
  
  	public boolean addAlgorithm(Object processID) {
  		if(!(processID instanceof String)){
  			return false;
  		}
  		String algorithmClassName = (String) processID;
  				
  		algorithmMap.put(algorithmClassName, algorithmClassName);
  		LOGGER.info("Algorithm class registered: " + algorithmClassName);
  					
  			
  		
  		return true;
  
  	}
  
  	public boolean removeAlgorithm(Object processID) {
  		if(!(processID instanceof String)){
  			return false;
  		}
  		String className = (String) processID;
  		if(algorithmMap.containsKey(className)){
  			algorithmMap.remove(className);
  			return true;
  		}
  		return false;
  	}
  
  	@Override
  	public ProcessDescriptionType getProcessDescription(String processID) {
  		if(!processDescriptionMap.containsKey(processID)){
  			processDescriptionMap.put(processID, getAlgorithm(processID).getDescription());
  		}
  		return processDescriptionMap.get(processID);
  	}
  
  	@Override
  	public void shutdown() {
  		// TODO Auto-generated method stub
  		
      }
  		
  	
  	
  
  	
  
  	
  
  
  	
  
  }
  