gerrit.onap Code Review - vfc/nfvo/wfengine.git/blob

   1 /*******************************************************************************
   2  * Copyright (c) 2012-2013 University of Stuttgart.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * and the Apache License 2.0 which both accompany this distribution,
   6  * and are available at http://www.eclipse.org/legal/epl-v10.html
   7  * and http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Contributors:
  10  *     Oliver Kopp - initial API and implementation
  11  *******************************************************************************/
  12 package org.eclipse.winery.repository.resources._support.collections.withoutid;
  13
  14 import java.lang.reflect.Constructor;
  15 import java.util.List;
  16
  17 import javax.ws.rs.Path;
  18 import javax.ws.rs.PathParam;
  19
  20 import org.eclipse.winery.common.Util;
  21 import org.eclipse.winery.repository.Utils;
  22 import org.eclipse.winery.repository.resources.AbstractComponentInstanceResource;
  23 import org.eclipse.winery.repository.resources._support.IPersistable;
  24 import org.eclipse.winery.repository.resources._support.collections.EntityCollectionResource;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 import com.sun.jersey.api.NotFoundException;
  29
  30 /**
  31  * Class managing a list of entities. It is intended to manage subresources,
  32  * where the TOSCA specification did not specify a unique key. Currently, the
  33  * hashCode of the XML String representation is used. If other representation
  34  * should be used, the method {@code getEntityResource} has to be overriden.
  35  *
  36  * @param <EntityResourceT> the resource modeling the entity
  37  * @param <EntityT> the entity type of single items in the list
  38  */
  39 public abstract class EntityWithoutIdCollectionResource<EntityResourceT extends EntityWithoutIdResource<EntityT>, EntityT> extends EntityCollectionResource<EntityResourceT, EntityT> {
  40
  41         private static final Logger logger = LoggerFactory.getLogger(EntityWithoutIdCollectionResource.class);
  42
  43
  44         /**
  45          * {@inheritDoc}
  46          */
  47         public EntityWithoutIdCollectionResource(Class<EntityResourceT> entityResourceTClazz, Class<EntityT> entityTClazz, List<EntityT> list, IPersistable res) {
  48                 super(entityResourceTClazz, entityTClazz, list, res);
  49         }
  50
  51         /**
  52          * Method searching the list for an id with the hashcode instead of
  53          * getId(EntityT)
  54          */
  55         @Override
  56         @Path("{id}/")
  57         public EntityResourceT getEntityResource(@PathParam("id") String id) {
  58                 id = Util.URLdecode(id);
  59                 int idInt;
  60                 try {
  61                         idInt = Integer.parseInt(id);
  62                 } catch (java.lang.NumberFormatException e) {
  63                         throw new NotFoundException(id + " is not a valid id");
  64                 }
  65                 EntityT entity = null;
  66                 int idx = -1;
  67                 for (EntityT c : this.list) {
  68                         idx++;
  69                         // speed optimization - instead of using getId() we directly use the hash code
  70                         int hash = Utils.getXMLAsString(c).hashCode();
  71                         if (hash == idInt) {
  72                                 entity = c;
  73                                 break;
  74                         }
  75                 }
  76                 if (entity == null) {
  77                         throw new NotFoundException();
  78                 } else {
  79                         return this.getEntityResourceInstance(entity, idx);
  80                 }
  81         }
  82
  83         @Override
  84         public String getId(EntityT entity) {
  85                 return IdDeterminationWithHashCode.INSTANCE.getId(entity);
  86         }
  87
  88         /**
  89          * {@inheritDoc}
  90          */
  91         @Override
  92         protected EntityResourceT getEntityResourceInstance(EntityT entity, int idx) {
  93                 Constructor<EntityResourceT> constructor;
  94                 try {
  95                         constructor = this.entityResourceTClazz.getConstructor(this.entityTClazz, int.class, List.class, AbstractComponentInstanceResource.class);
  96                 } catch (Exception e) {
  97                         try {
  98                                 constructor = this.entityResourceTClazz.getConstructor(this.entityTClazz, int.class, List.class, IPersistable.class);
  99                         } catch (NoSuchMethodException | SecurityException e1) {
 100                                 EntityWithoutIdCollectionResource.logger.debug("Could not get constructor", e);
 101                                 throw new IllegalStateException(e);
 102                         }
 103                 }
 104                 EntityResourceT newInstance;
 105                 try {
 106                         newInstance = constructor.newInstance(entity, idx, this.list, this.res);
 107                 } catch (Exception e) {
 108                         EntityWithoutIdCollectionResource.logger.debug("Could not instantiate class", e);
 109                         throw new IllegalStateException(e);
 110                 }
 111                 return newInstance;
 112         }
 113
 114 }