Package org.apache.sling.query.api.function

Source Code of org.apache.sling.query.api.function.Option

/*-
* 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.sling.query.api.function;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

public class Option<T> {
  private final T element;

  private final int argumentId;

  private Option(T element, int argumentId) {
    this.element = element;
    this.argumentId = argumentId;
  }

  public static <T> Option<T> of(T element, int argumentId) {
    return new Option<T>(element, argumentId);
  }

  public static <T> Option<T> empty(int argumentId) {
    return new Option<T>(null, argumentId);
  }

  public int getArgumentId() {
    return argumentId;
  }

  public T getElement() {
    return element;
  }

  public boolean isEmpty() {
    return element == null;
  }

  public String toString() {
    if (isEmpty()) {
      return "Option[-]";
    } else {
      return String.format("Option[%s]", element.toString());
    }
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (obj == this) {
      return true;
    }
    if (obj.getClass() != getClass()) {
      return false;
    }
    Option<?> rhs = (Option<?>) obj;
    return new EqualsBuilder().append(element, rhs.element).isEquals();
  }

  @Override
  public int hashCode() {
    return new HashCodeBuilder().append(element).toHashCode();
  }
}
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