/*
    *
    * 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.hadoop.hbase.rest.model;
  
  import com.fasterxml.jackson.annotation.JsonProperty;
  
  import java.io.IOException;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlElement;
  import javax.xml.bind.annotation.XmlRootElement;
  
  import org.apache.hadoop.hbase.NamespaceDescriptor;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.client.Admin;
  import org.apache.hadoop.hbase.rest.ProtobufMessageHandler;
  import org.apache.hadoop.hbase.rest.protobuf.generated.NamespacesMessage.Namespaces;
  
  
  /**
   * A list of HBase namespaces.
   * <ul>
   * <li>Namespace: namespace name</li>
   * </ul>
   */
  @XmlRootElement(name="Namespaces")
  @XmlAccessorType(XmlAccessType.FIELD)
  @InterfaceAudience.Private
  public class NamespacesModel implements Serializable, ProtobufMessageHandler {
  
    private static final long serialVersionUID = 1L;
  
    @JsonProperty("Namespace")
    @XmlElement(name="Namespace")
    private List<String> namespaces = new ArrayList<String>();
  
    /**
     * Default constructor. Do not use.
     */
    public NamespacesModel() {}
  
    /**
     * Constructor
     * @param admin the administrative API
     * @throws IOException
     */
    public NamespacesModel(Admin admin) throws IOException {
      NamespaceDescriptor[] nds = admin.listNamespaceDescriptors();
      namespaces = new ArrayList<String>();
      for (NamespaceDescriptor nd : nds) {
        namespaces.add(nd.getName());
      }
    }
  
    /**
     * @return all namespaces
     */
    public List<String> getNamespaces() {
      return namespaces;
    }
  
    /**
     * @param namespaces the namespace name array
     */
    public void setNamespaces(List<String> namespaces) {
      this.namespaces = namespaces;
    }
  
    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder();
      for (String namespace : namespaces) {
        sb.append(namespace);
        sb.append("\n");
      }
     return sb.toString();
   }
 
   @Override
   public byte[] createProtobufOutput() {
     Namespaces.Builder builder = Namespaces.newBuilder();
     builder.addAllNamespace(namespaces);
     return builder.build().toByteArray();
   }
 
   @Override
   public ProtobufMessageHandler getObjectFromMessage(byte[] message) throws IOException {
     Namespaces.Builder builder = Namespaces.newBuilder();
     builder.mergeFrom(message);
     namespaces = builder.getNamespaceList();
     return this;
   }
 }