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.state;
  
  import org.apache.ambari.server.orm.entities.ExtensionEntity;
  import org.apache.ambari.server.utils.VersionUtils;
  
  /**
   * 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.
   */
  public class ExtensionId implements Comparable<ExtensionId> {
  
    private static final String NAME_SEPARATOR = "-";
  
    private String extensionName;
    private String extensionVersion;
  
    public ExtensionId() {
      extensionName = "";
      extensionVersion = "";
    }
  
    public ExtensionId(String extensionId) {
      parseExtensionIdHelper(this, extensionId);
    }
  
    public ExtensionId(ExtensionInfo extension) {
      extensionName = extension.getName();
      extensionVersion = extension.getVersion();
    }
  
    public ExtensionId(String extensionName, String extensionVersion) {
      this(extensionName + NAME_SEPARATOR + extensionVersion);
    }
  
    public ExtensionId(ExtensionEntity entity) {
      this(entity.getExtensionName(), entity.getExtensionVersion());
    }
  
    /**
     * @return the extensionName
     */
    public String getExtensionName() {
      return extensionName;
    }
  
    /**
     * @return the extensionVersion
     */
    public String getExtensionVersion() {
      return extensionVersion;
    }
  
    /**
     * @return the extensionVersion
     */
    public String getExtensionId() {
      if (extensionName.isEmpty()
          && extensionVersion.isEmpty()) {
        return "";
      }
      return extensionName + NAME_SEPARATOR + extensionVersion;
    }
  
    /**
     * @param extensionId the extensionVersion to set
     */
    public void setExtensionId(String extensionId) {
      parseExtensionIdHelper(this, extensionId);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object object) {
      if (!(object instanceof ExtensionId)) {
        return false;
      }
      if (this == object) {
        return true;
      }
      ExtensionId s = (ExtensionId) object;
      return extensionName.equals(s.extensionName) && extensionVersion.equals(s.extensionVersion);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
      int result = extensionName != null ? extensionName.hashCode() : 0;
      result = 31 * result + (extensionVersion != null ? extensionVersion.hashCode() : 0);
      return result;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public int compareTo(ExtensionId other) {
      if (this == other) {
        return 0;
      }
  
      if (other == null) {
        throw new RuntimeException("Cannot compare with a null value.");
      }
  
      int returnValue = getExtensionName().compareTo(other.getExtensionName());
      if (returnValue == 0) {
        returnValue = VersionUtils.compareVersions(getExtensionVersion(), other.getExtensionVersion());
      } else {
        throw new RuntimeException("ExtensionId with different names cannot be compared.");
      }
      return returnValue;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
      return getExtensionId();
    }
  
    private void parseExtensionIdHelper(ExtensionId extensionVersion, String extensionId) {
      if (extensionId == null || extensionId.isEmpty()) {
        extensionVersion.extensionName = "";
        extensionVersion.extensionVersion = "";
        return;
      }
  
      int pos = extensionId.indexOf('-');
      if (pos == -1 || (extensionId.length() <= (pos + 1))) {
        throw new RuntimeException("Could not parse invalid Extension Id" + ", extensionId=" + extensionId);
      }
  
      extensionVersion.extensionName = extensionId.substring(0, pos);
      extensionVersion.extensionVersion = extensionId.substring(pos + 1);
    }
  }
  