activities/src/main/java/org/apache/abdera2/activities/protocol/AbstractActivitiesProvider.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  The ASF licenses this file to You
 * 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.  For additional information regarding
 * copyright in this work, please see the NOTICE file in the top level
 * directory of this distribution.
 */
package org.apache.abdera2.activities.protocol;

import java.util.HashSet;
import java.util.Set;

import org.apache.abdera2.activities.model.ASBase;
import org.apache.abdera2.activities.model.ASObject;
import org.apache.abdera2.activities.model.Activity;
import org.apache.abdera2.activities.model.Collection;
import org.apache.abdera2.activities.model.TypeAdapter;
import org.apache.abdera2.common.date.DateTime;
import org.apache.abdera2.common.http.EntityTag;
import org.apache.abdera2.common.mediatype.MimeTypeHelper;
import org.apache.abdera2.common.protocol.BaseProvider;
import org.apache.abdera2.common.protocol.CollectionRequestProcessor;
import org.apache.abdera2.common.protocol.EntryRequestProcessor;
import org.apache.abdera2.common.protocol.RequestContext;
import org.apache.abdera2.common.protocol.ResponseContext;
import org.apache.abdera2.common.protocol.TargetType;

public abstract class AbstractActivitiesProvider 
  extends BaseProvider
  implements ActivitiesProvider {

  protected Set<TypeAdapter<?>> typeAdapters = new HashSet<TypeAdapter<?>>();
  
  protected AbstractActivitiesProvider() {
    this.requestProcessors.put(
      TargetType.TYPE_COLLECTION, 
      new CollectionRequestProcessor() {
        protected boolean isAcceptableItemType(RequestContext context) {
          return MimeTypeHelper.isMatch(
            context.getContentType().toString(), 
            "application/json");
        }        
      });
    this.requestProcessors.put(
      TargetType.TYPE_ENTRY, 
      new EntryRequestProcessor());
  }
  
  public void addTypeAdapter(TypeAdapter<?> typeAdapter) {
    typeAdapters.add(typeAdapter);
  }
  
  public void removeTypeAdapter(TypeAdapter<?> typeAdapter) {
    typeAdapters.remove(typeAdapter);
  }
  
  public Set<TypeAdapter<?>> getTypeAdapters() {
    return typeAdapters;
  }
  
  @SuppressWarnings("unchecked")
  public <S extends ResponseContext> S createErrorResponse(
    int code,
    String message, 
    Throwable t) {
      ErrorObject errorObject = new ErrorObject();
      errorObject.setDisplayName(message);
      errorObject.setCode(code);
      ActivitiesResponseContext<ErrorObject> rc = 
        new ActivitiesResponseContext<ErrorObject>(errorObject);
      rc.setStatus(code);
      rc.setStatusText(message);
      return (S)rc;
  }

  @Override
  public <S extends ResponseContext> S process(RequestContext request) {
    return super.process(
      request instanceof ActivitiesRequestContext?
        request:
        new ActivitiesRequestContext(request));
  }

  public static EntityTag calculateEntityTag(ASBase base) {
    String id = null;
    String modified = null;
    if (base instanceof Activity) {
        Activity ac = (Activity)base;
        id = ac.getId();
        modified = DateTime.format(ac.getUpdated() != null ? ac.getUpdated() : ac.getPublished());
    } else if (base instanceof Collection) {
        Collection<?> col = (Collection<?>)base;
        id = col.getProperty("id");
        if (id == null) id = java.util.UUID.randomUUID().toString();
        modified = col.getProperty("updated");
    } else if (base instanceof ASObject) {
        ASObject as = (ASObject)base;
        id = as.getId().toString();
        modified = DateTime.format(as.getUpdated() != null ? as.getUpdated() : as.getPublished());
    }
    if (modified == null) modified = DateTime.formatNow();
    return EntityTag.generate(id, modified);
  }
  
  public static String getEditUriFromEntry(ASObject object) {
    String editLink = object.getProperty("editLink");
    return editLink;
  }
}