/*
    * 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.syncope.common.lib.request;
  
  import org.apache.commons.lang3.builder.EqualsBuilder;
  import org.apache.commons.lang3.builder.HashCodeBuilder;
  import org.apache.syncope.common.lib.BaseBean;
  import org.apache.syncope.common.lib.types.PatchOperation;
  
  public abstract class AbstractPatch implements BaseBean {
  
      private static final long serialVersionUID = -4729181508529829580L;
  
      protected abstract static class Builder<P extends AbstractPatch, B extends Builder<P, B>> {
  
          protected P instance;
  
          protected abstract P newInstance();
  
          protected P getInstance() {
              if (instance == null) {
                  instance = newInstance();
              }
              return instance;
          }
  
          @SuppressWarnings("unchecked")
          public B operation(final PatchOperation operation) {
              getInstance().setOperation(operation);
              return (B) this;
          }
  
          public P build() {
              if (getInstance().getOperation() == null) {
                  instance.setOperation(PatchOperation.ADD_REPLACE);
              }
              return getInstance();
          }
      }
  
      private PatchOperation operation;
  
      public PatchOperation getOperation() {
          return operation;
      }
  
      public void setOperation(final PatchOperation operation) {
          this.operation = operation;
      }
  
      @Override
      public int hashCode() {
          return new HashCodeBuilder().
                  append(operation).
                  build();
      }
  
      @Override
      public boolean equals(final Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
          final AbstractPatch other = (AbstractPatch) obj;
          return new EqualsBuilder().
                  append(operation, other.operation).
                  build();
      }
  }