content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  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.
   */
  
  package org.apache.ambari.server.api.resources;
  
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.ambari.server.api.query.render.DefaultRenderer;
  import org.apache.ambari.server.api.query.render.MetricsPaddingRenderer;
  import org.apache.ambari.server.api.query.render.MinimalRenderer;
  import org.apache.ambari.server.api.query.render.Renderer;
  import org.apache.ambari.server.api.services.Request;
  import org.apache.ambari.server.api.util.TreeNode;
  import org.apache.ambari.server.controller.spi.ClusterController;
  import org.apache.ambari.server.controller.spi.Resource;
  import org.apache.ambari.server.controller.spi.Schema;
  import org.apache.ambari.server.controller.utilities.ClusterControllerHelper;
  import org.apache.commons.codec.EncoderException;
  import org.apache.commons.codec.net.URLCodec;
  
  /**
   * Base resource definition.  Contains behavior common to all resource types.
   */
  public abstract class BaseResourceDefinition implements ResourceDefinition {
  
    /**
     * Resource type.  One of {@link Resource.Type}
     */
    private Resource.Type m_type;
  
    /**
     * The sub-resource type definitions.
     */
    private final Set<SubResourceDefinition> subResourceDefinitions = new HashSet<>();
  
    /**
     * A map of directives for the different request types, each entry is expected to be modifiable by sub resources.
     */
    private final Map<DirectiveType, Collection<String>> directives = new HashMap<>();
  
    /**
     * Constructor.
     *
     * @param resourceType resource type
     */
    public BaseResourceDefinition(Resource.Type resourceType) {
      this(resourceType, null, null);
    }
  
    /**
     * Constructor.
     *
     * @param resourceType  the resource type
     * @param subTypes      the sub-resource types
     */
    public BaseResourceDefinition(Resource.Type resourceType, Resource.Type ... subTypes) {
      this(resourceType, (subTypes == null) ? null : Arrays.asList(subTypes), null);
    }
  
    /**
     * Constructor.
     *
     * @param resourceType the resource type
     * @param subTypes     the sub-resource types
     * @param directives   a map of directives for request types for this resource
     */
    public BaseResourceDefinition(Resource.Type resourceType,
                                  Collection<Resource.Type> subTypes,
                                  Map<DirectiveType, ? extends Collection<String>> directives) {
      m_type = resourceType;
  
      if (subTypes != null) {
        for (Resource.Type subType : subTypes) {
          subResourceDefinitions.add(new SubResourceDefinition(subType));
        }
      }
  
      initializeDirectives(DirectiveType.READ, directives);
      initializeDirectives(DirectiveType.CREATE, directives);
      initializeDirectives(DirectiveType.UPDATE, directives);
      initializeDirectives(DirectiveType.DELETE, directives);
    }
  
    @Override
    public Resource.Type getType() {
      return m_type;
    }
  
    @Override
    public Set<SubResourceDefinition> getSubResourceDefinitions() {
      return subResourceDefinitions;
    }
  
    @Override
    public List<PostProcessor> getPostProcessors() {
      List<PostProcessor> listProcessors = new ArrayList<>();
      listProcessors.add(new BaseHrefPostProcessor());
      return listProcessors;
    }
  
    @Override
    public Renderer getRenderer(String name) {
      if (name == null || name.equals("default")) {
        return new DefaultRenderer();
      } else if (name.equals("minimal")) {
        return new MinimalRenderer();
      } else if (name.contains("null_padding")
                || name.contains("no_padding")
                || name.contains("zero_padding")) {
        return new MetricsPaddingRenderer(name);
      } else {
        throw new IllegalArgumentException("Invalid renderer name for resource of type " + m_type);
      }
    }
  
    ClusterController getClusterController() {
      return ClusterControllerHelper.getClusterController();
    }
  
    @Override
    public Collection<String> getReadDirectives() {
      // return a collection which can be modified by sub resources
      return directives.get(DirectiveType.READ);
    }
  
    @Override
    public Collection<String> getCreateDirectives() {
      // return a collection which can be modified by sub resources
      return directives.get(DirectiveType.CREATE);
    }
  
    @Override
    public Collection<String> getUpdateDirectives() {
      // return a collection which can be modified by sub resources
      return directives.get(DirectiveType.UPDATE);
    }
  
    @Override
    public Collection<String> getDeleteDirectives() {
      // return a collection which can be modified by sub resources
      return directives.get(DirectiveType.DELETE);
    }
  
    @Override
    public boolean equals(Object o) {
      boolean result =false;
      if(this == o) result = true;
      if(o instanceof BaseResourceDefinition){
          BaseResourceDefinition other = (BaseResourceDefinition) o;
          if(m_type == other.m_type )
              result = true;
      }
      return result;
    }
  
    @Override
    public int hashCode() {
      return m_type.hashCode();
    }
  
    @Override
    public boolean isCreatable() {
      // by default all resources are creatable
      return true;
    }
  
    class BaseHrefPostProcessor implements PostProcessor {
      @Override
      public void process(Request request, TreeNode<Resource> resultNode, String href) {
        Resource r = resultNode.getObject();
        TreeNode<Resource> parent = resultNode.getParent();
  
        if (parent.getName() != null) {
  
          int i = href.indexOf("?");
          if (i != -1) {
            href = href.substring(0, i);
          }
  
          if (!href.endsWith("/")) {
            href = href + '/';
          }
  
          Schema schema = getClusterController().getSchema(r.getType());
          Object id = r.getPropertyValue(schema.getKeyPropertyId(r.getType()));
  
          String hrefIdPart = urlencode(id);
  
          href = parent.getStringProperty("isCollection").equals("true") ?
              href + hrefIdPart : href + parent.getName() + '/' + hrefIdPart;
        }
        resultNode.setProperty("href", href);
      }
  
      /**
       * URL encodes the id (string) value
       *
       * @param id the id to URL encode
       * @return null if id is null, else the URL encoded value of the id
       */
      protected String urlencode(Object id) {
        if (id == null)
          return "";
        else {
          try {
            return new URLCodec().encode(id.toString());
          } catch (EncoderException e) {
            return id.toString();
          }
        }
      }
    }
  
    /**
     * Initializes the specified collection of directives into a modifiable set of directives for the specified type of directives.
     *
     * @param type       a request type
     * @param directives the map of directives from which to copy
     */
    private void initializeDirectives(DirectiveType type, Map<DirectiveType, ? extends Collection<String>> directives) {
      HashSet<String> requestDirectives = new HashSet<>();
  
      if ((directives != null) && directives.get(type) != null) {
        requestDirectives.addAll(directives.get(type));
      }
  
      this.directives.put(type, requestDirectives);
    }
  
    public enum DirectiveType {
      CREATE,
      READ,
      UPDATE,
      DELETE
    }
  }
  