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.StackEntity;
  import org.apache.ambari.server.utils.VersionUtils;
  
  public class StackId implements Comparable<StackId> {
  
    private static final String NAME_SEPARATOR = "-";
  
    private String stackName;
    private String stackVersion;
  
    public StackId() {
      stackName = "";
      stackVersion = "";
    }
  
    public StackId(String stackId) {
      parseStackIdHelper(this, stackId);
    }
  
    public StackId(StackInfo stackInfo) {
      stackName = stackInfo.getName();
      stackVersion = stackInfo.getVersion();
    }
  
    public StackId(String stackName, String stackVersion) {
      this(stackName + NAME_SEPARATOR + stackVersion);
    }
  
    public StackId(StackEntity stackEntity) {
      this(stackEntity.getStackName(), stackEntity.getStackVersion());
    }
  
    /**
     * @return the stackName
     */
    public String getStackName() {
      return stackName;
    }
  
    /**
     * @return the stackVersion
     */
    public String getStackVersion() {
      return stackVersion;
    }
  
    /**
     * @return the stackVersion
     */
    public String getStackId() {
      if (stackName.isEmpty()
          && stackVersion.isEmpty()) {
        return "";
      }
      return stackName + NAME_SEPARATOR + stackVersion;
    }
  
    /**
     * @param stackId the stackVersion to set
     */
    public void setStackId(String stackId) {
      parseStackIdHelper(this, stackId);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object object) {
      if (!(object instanceof StackId)) {
        return false;
      }
      if (this == object) {
        return true;
      }
      StackId s = (StackId) object;
      return stackName.equals(s.stackName) && stackVersion.equals(s.stackVersion);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
      int result = stackName != null ? stackName.hashCode() : 0;
      result = 31 * result + (stackVersion != null ? stackVersion.hashCode() : 0);
      return result;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public int compareTo(StackId other) {
      if (this == other) {
        return 0;
      }
  
      if (other == null) {
        throw new RuntimeException("Cannot compare with a null value.");
      }
  
      int returnValue = getStackName().compareTo(other.getStackName());
      if (returnValue == 0) {
        returnValue = VersionUtils.compareVersions(getStackVersion(), other.getStackVersion());
      } else {
        throw new RuntimeException("StackId with different names cannot be compared.");
      }
      return returnValue;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
      return getStackId();
    }
  
    private void parseStackIdHelper(StackId stackVersion, String stackId) {
      if (stackId == null || stackId.isEmpty()) {
        stackVersion.stackName = "";
        stackVersion.stackVersion = "";
        return;
      }
  
      int pos = stackId.indexOf('-');
      if (pos == -1 || (stackId.length() <= (pos + 1))) {
        throw new RuntimeException("Could not parse invalid Stack Id" + ", stackId=" + stackId);
      }
  
      stackVersion.stackName = stackId.substring(0, pos);
      stackVersion.stackVersion = stackId.substring(pos + 1);
    }
  }
  