| /* |
| * 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.commons.math4.legacy.core; |
| |
| /** |
| * Interface representing a <a href="http://mathworld.wolfram.com/Field.html">field</a>. |
| * <p> |
| * Classes implementing this interface will often be singletons. |
| * </p> |
| * @param <T> the type of the field elements |
| * @see FieldElement |
| * @since 2.0 |
| */ |
| public interface Field<T> { |
| |
| /** Get the additive identity of the field. |
| * <p> |
| * The additive identity is the element e<sub>0</sub> of the field such that |
| * for all elements a of the field, the equalities a + e<sub>0</sub> = |
| * e<sub>0</sub> + a = a hold. |
| * </p> |
| * @return additive identity of the field |
| */ |
| T getZero(); |
| |
| /** Get the multiplicative identity of the field. |
| * <p> |
| * The multiplicative identity is the element e<sub>1</sub> of the field such that |
| * for all elements a of the field, the equalities a × e<sub>1</sub> = |
| * e<sub>1</sub> × a = a hold. |
| * </p> |
| * @return multiplicative identity of the field |
| */ |
| T getOne(); |
| |
| /** |
| * Returns the runtime class of the FieldElement. |
| * |
| * @return The {@code Class} object that represents the runtime |
| * class of this object. |
| */ |
| Class<? extends FieldElement<T>> getRuntimeClass(); |
| |
| } |