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.orm.entities;
  
  import jakarta.persistence.Column;
  import jakarta.persistence.Entity;
  import jakarta.persistence.GeneratedValue;
  import jakarta.persistence.GenerationType;
  import jakarta.persistence.Id;
  import jakarta.persistence.JoinColumn;
  import jakarta.persistence.NamedQueries;
  import jakarta.persistence.NamedQuery;
  import jakarta.persistence.OneToOne;
  import jakarta.persistence.Table;
  import jakarta.persistence.TableGenerator;
  import jakarta.persistence.UniqueConstraint;
  
  /**
   * The {@link ExtensionLinkEntity} class is used to model the extensions linked to the stack.
   *
   * An extension version is like a stack version but it contains custom services.  Linking an extension
   * version to the current stack version allows the cluster to install the custom services contained in
   * the extension version.
   */
  @Table(name = "extensionlink", uniqueConstraints = @UniqueConstraint(columnNames = {
  		"stack_id", "extension_id" }))
  @TableGenerator(name = "link_id_generator", table = "ambari_sequences", pkColumnName = "sequence_name", valueColumnName = "sequence_value", pkColumnValue = "link_id_seq", initialValue = 0)
  @NamedQueries({
      @NamedQuery(name = "ExtensionLinkEntity.findAll", query = "SELECT link FROM ExtensionLinkEntity link"),
      @NamedQuery(name = "ExtensionLinkEntity.findByStackAndExtensionName", query = "SELECT link FROM ExtensionLinkEntity link WHERE link.stack.stackName = :stackName AND link.stack.stackVersion = :stackVersion AND link.extension.extensionName = :extensionName"),
      @NamedQuery(name = "ExtensionLinkEntity.findByStackAndExtension", query = "SELECT link FROM ExtensionLinkEntity link WHERE link.stack.stackName = :stackName AND link.stack.stackVersion = :stackVersion AND link.extension.extensionName = :extensionName AND link.extension.extensionVersion = :extensionVersion"),
      @NamedQuery(name = "ExtensionLinkEntity.findByStack", query = "SELECT link FROM ExtensionLinkEntity link WHERE link.stack.stackName = :stackName AND link.stack.stackVersion = :stackVersion"),
      @NamedQuery(name = "ExtensionLinkEntity.findByExtension", query = "SELECT link FROM ExtensionLinkEntity link WHERE link.extension.extensionName = :extensionName AND link.extension.extensionVersion = :extensionVersion") })
  @Entity
  public class ExtensionLinkEntity {
  
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE, generator = "link_id_generator")
    @Column(name = "link_id", nullable = false, updatable = false)
    private Long linkId;
  
    @OneToOne
    @JoinColumn(name = "stack_id", unique = false, nullable = false, insertable = true, updatable = false)
    private StackEntity stack;
  
    @OneToOne
    @JoinColumn(name = "extension_id", unique = false, nullable = false, insertable = true, updatable = false)
    private ExtensionEntity extension;
  
    /**
     * Constructor.
     */
    public ExtensionLinkEntity() {
    }
  
    public Long getLinkId() {
      return linkId;
    }
  
    public void setLinkId(Long linkId) {
      this.linkId = linkId;
    }
  
    public StackEntity getStack() {
      return stack;
    }
  
    public void setStack(StackEntity stack) {
      this.stack = stack;
    }
  
    public ExtensionEntity getExtension() {
      return extension;
    }
  
    public void setExtension(ExtensionEntity extension) {
      this.extension = extension;
    }
  
    /**
     *
     */
    @Override
    public boolean equals(Object object) {
      if (this == object) {
        return true;
      }
  
      if (object == null || getClass() != object.getClass()) {
        return false;
      }
  
      ExtensionLinkEntity that = (ExtensionLinkEntity) object;
  
      if (linkId != null ? !linkId.equals(that.linkId) : that.linkId != null) {
        return false;
      }
  
      return true;
    }
  
    /**
     *
     */
    @Override
    public int hashCode() {
      int result = (null != linkId) ? linkId.hashCode() : 0;
      return result;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
      StringBuilder buffer = new StringBuilder();
      buffer.append(getClass().getSimpleName());
      buffer.append("{");
      buffer.append("linkId=").append(linkId);
      buffer.append(", stackId=").append(stack.getStackId());
      buffer.append(", extensionId=").append(extension.getExtensionId());
      buffer.append("}");
      return buffer.toString();
    }
  }
  