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/*
 * Copyright 2012 Google Inc.
 *
 * Licensed 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 com.google.gwt.validation.client.impl;

import javax.validation.groups.Default;

/**
 * Encapsulates a single validation group.
 * 
 * Modified from the Hibernate validator for use with GWT.
 */
public class Group {
  /**
   * The actual group.
   */
  private final Class group;

  /**
   * The sequence the group is part of ({@code null}, if this group is not part of a sequence).
   */
  private final Class sequence;

  /**
   * Creates a group that is not part of a sequence with no parents.
   * @param group The validation group.
   */
  public Group(Class group) {
    this(group, null);
  }

  /**
   * Creates a group that is part of a sequence with no parents.
   * @param group The validation group. Must not be null.
   * @param sequence The sequence the group is a part of. Can be null if the group is not part of
   * a sequence.
   */
  public Group(Class group, Class sequence) {
    if (group == null) {
      throw new IllegalArgumentException("The group class must not be null");
    }
    this.group = group;
    this.sequence = sequence;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof Group)) {
      return false;
    }
    Group other = (Group) o;
    return group.equals(other.group);
  }

  public Class getGroup() {
    return group;
  }

  public Class getSequence() {
    return sequence;
  }

  @Override
  public int hashCode() {
    return group.hashCode();
  }

  public boolean isDefaultGroup() {
    return getGroup().getName().equals(Default.class.getName());
  }

  @Override
  public String toString() {
    return "Group{" + "group=" + group.getName() + "}";
  }
}