| /*- |
| * 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.internal; |
| |
| 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<>(element, argumentId); |
| } |
| |
| public static <T> Option<T> empty(int argumentId) { |
| return new Option<>(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(); |
| } |
| } |