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Update #0 - First Release
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334
sources/main/java/org/apache/commons/lang3/EnumUtils.java
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334
sources/main/java/org/apache/commons/lang3/EnumUtils.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* <p>
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* Utility library to provide helper methods for Java enums.
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* </p>
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*
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* <p>
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* #ThreadSafe#
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* </p>
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*
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* @since 3.0
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*/
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public class EnumUtils {
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private static final String NULL_ELEMENTS_NOT_PERMITTED = "null elements not permitted";
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private static final String CANNOT_STORE_S_S_VALUES_IN_S_BITS = "Cannot store %s %s values in %s bits";
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private static final String S_DOES_NOT_SEEM_TO_BE_AN_ENUM_TYPE = "%s does not seem to be an Enum type";
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private static final String ENUM_CLASS_MUST_BE_DEFINED = "EnumClass must be defined.";
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/**
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* Validate {@code enumClass}.
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*
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* @param <E> the type of the enumeration
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* @param enumClass to check
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* @return {@code enumClass}
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* @throws NullPointerException if {@code enumClass} is {@code null}
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* @throws IllegalArgumentException if {@code enumClass} is not an enum class
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* @since 3.2
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*/
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private static <E extends Enum<E>> Class<E> asEnum(final Class<E> enumClass) {
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Validate.notNull(enumClass, ENUM_CLASS_MUST_BE_DEFINED);
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Validate.isTrue(enumClass.isEnum(), S_DOES_NOT_SEEM_TO_BE_AN_ENUM_TYPE, enumClass);
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return enumClass;
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}
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/**
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* Validate that {@code enumClass} is compatible with representation in a
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* {@code long}.
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*
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* @param <E> the type of the enumeration
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* @param enumClass to check
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* @return {@code enumClass}
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* @throws NullPointerException if {@code enumClass} is {@code null}
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* @throws IllegalArgumentException if {@code enumClass} is not an enum class or
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* has more than 64 values
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* @since 3.0.1
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*/
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private static <E extends Enum<E>> Class<E> checkBitVectorable(final Class<E> enumClass) {
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final E[] constants = asEnum(enumClass).getEnumConstants();
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Validate.isTrue(constants.length <= Long.SIZE, CANNOT_STORE_S_S_VALUES_IN_S_BITS,
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Integer.valueOf(constants.length), enumClass.getSimpleName(), Integer.valueOf(Long.SIZE));
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return enumClass;
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}
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/**
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* <p>
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* Creates a long bit vector representation of the given array of Enum values.
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* </p>
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*
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* <p>
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* This generates a value that is usable by {@link EnumUtils#processBitVector}.
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* </p>
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*
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* <p>
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* Do not use this method if you have more than 64 values in your Enum, as this
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* would create a value greater than a long can hold.
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* </p>
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*
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* @param enumClass the class of the enum we are working with, not {@code null}
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* @param values the values we want to convert, not {@code null}
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* @param <E> the type of the enumeration
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* @return a long whose value provides a binary representation of the given set
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* of enum values.
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* @throws NullPointerException if {@code enumClass} or {@code values} is
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* {@code null}
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* @throws IllegalArgumentException if {@code enumClass} is not an enum class or
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* has more than 64 values
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* @since 3.0.1
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* @see #generateBitVectors(Class, Iterable)
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*/
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@SafeVarargs
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public static <E extends Enum<E>> long generateBitVector(final Class<E> enumClass, final E... values) {
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Validate.noNullElements(values);
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return generateBitVector(enumClass, Arrays.asList(values));
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}
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/**
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* <p>
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* Creates a long bit vector representation of the given subset of an Enum.
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* </p>
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*
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* <p>
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* This generates a value that is usable by {@link EnumUtils#processBitVector}.
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* </p>
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*
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* <p>
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* Do not use this method if you have more than 64 values in your Enum, as this
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* would create a value greater than a long can hold.
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* </p>
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*
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* @param enumClass the class of the enum we are working with, not {@code null}
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* @param values the values we want to convert, not {@code null}, neither
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* containing {@code null}
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* @param <E> the type of the enumeration
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* @return a long whose value provides a binary representation of the given set
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* of enum values.
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* @throws NullPointerException if {@code enumClass} or {@code values} is
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* {@code null}
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* @throws IllegalArgumentException if {@code enumClass} is not an enum class or
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* has more than 64 values, or if any
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* {@code values} {@code null}
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* @since 3.0.1
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* @see #generateBitVectors(Class, Iterable)
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*/
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public static <E extends Enum<E>> long generateBitVector(final Class<E> enumClass,
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final Iterable<? extends E> values) {
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checkBitVectorable(enumClass);
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Validate.notNull(values);
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long total = 0;
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for (final E constant : values) {
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Validate.notNull(constant, NULL_ELEMENTS_NOT_PERMITTED);
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total |= 1L << constant.ordinal();
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}
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return total;
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}
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/**
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* <p>
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* Gets the enum for the class, returning {@code null} if not found.
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* </p>
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*
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* <p>
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* This method differs from {@link Enum#valueOf} in that it does not throw an
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* exception for an invalid enum name.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @param enumName the enum name, null returns null
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* @return the enum, null if not found
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*/
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public static <E extends Enum<E>> E getEnum(final Class<E> enumClass, final String enumName) {
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return getEnum(enumClass, enumName, null);
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}
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/**
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* <p>
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* Gets the enum for the class, returning {@code defaultEnum} if not found.
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* </p>
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*
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* <p>
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* This method differs from {@link Enum#valueOf} in that it does not throw an
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* exception for an invalid enum name.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @param enumName the enum name, null returns default enum
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* @param defaultEnum the default enum
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* @return the enum, default enum if not found
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* @since 3.10
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*/
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public static <E extends Enum<E>> E getEnum(final Class<E> enumClass, final String enumName, final E defaultEnum) {
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if (enumName == null) {
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return defaultEnum;
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}
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try {
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return Enum.valueOf(enumClass, enumName);
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} catch (final IllegalArgumentException ex) {
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return defaultEnum;
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}
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}
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/**
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* <p>
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* Gets the enum for the class, returning {@code null} if not found.
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* </p>
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*
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* <p>
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* This method differs from {@link Enum#valueOf} in that it does not throw an
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* exception for an invalid enum name and performs case insensitive matching of
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* the name.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @param enumName the enum name, null returns null
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* @return the enum, null if not found
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* @since 3.8
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*/
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public static <E extends Enum<E>> E getEnumIgnoreCase(final Class<E> enumClass, final String enumName) {
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return getEnumIgnoreCase(enumClass, enumName, null);
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}
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/**
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* <p>
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* Gets the enum for the class, returning {@code defaultEnum} if not found.
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* </p>
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*
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* <p>
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* This method differs from {@link Enum#valueOf} in that it does not throw an
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* exception for an invalid enum name and performs case insensitive matching of
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* the name.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @param enumName the enum name, null returns default enum
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* @param defaultEnum the default enum
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* @return the enum, default enum if not found
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* @since 3.10
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*/
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public static <E extends Enum<E>> E getEnumIgnoreCase(final Class<E> enumClass, final String enumName,
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final E defaultEnum) {
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if (enumName == null || !enumClass.isEnum()) {
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return defaultEnum;
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}
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for (final E each : enumClass.getEnumConstants()) {
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if (each.name().equalsIgnoreCase(enumName)) {
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return each;
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}
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}
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return defaultEnum;
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}
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/**
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* <p>
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* Gets the {@code List} of enums.
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* </p>
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*
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* <p>
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* This method is useful when you need a list of enums rather than an array.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @return the modifiable list of enums, never null
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*/
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public static <E extends Enum<E>> List<E> getEnumList(final Class<E> enumClass) {
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return new ArrayList<>(Arrays.asList(enumClass.getEnumConstants()));
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}
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/**
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* <p>
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* Gets the {@code Map} of enums by name.
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* </p>
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*
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* <p>
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* This method is useful when you need a map of enums by name.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @return the modifiable map of enum names to enums, never null
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*/
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public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
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final Map<String, E> map = new LinkedHashMap<>();
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for (final E e : enumClass.getEnumConstants()) {
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map.put(e.name(), e);
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}
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return map;
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}
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/**
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* <p>
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* Checks if the specified name is a valid enum for the class.
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* </p>
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*
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* <p>
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* This method differs from {@link Enum#valueOf} in that checks if the name is a
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* valid enum without needing to catch the exception.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @param enumName the enum name, null returns false
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* @return true if the enum name is valid, otherwise false
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*/
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public static <E extends Enum<E>> boolean isValidEnum(final Class<E> enumClass, final String enumName) {
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return getEnum(enumClass, enumName) != null;
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}
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/**
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* <p>
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* Checks if the specified name is a valid enum for the class.
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* </p>
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*
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* <p>
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* This method differs from {@link Enum#valueOf} in that checks if the name is a
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* valid enum without needing to catch the exception and performs case
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* insensitive matching of the name.
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* </p>
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*
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* @param <E> the type of the enumeration
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* @param enumClass the class of the enum to query, not null
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* @param enumName the enum name, null returns false
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* @return true if the enum name is valid, otherwise false
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* @since 3.8
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*/
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public static <E extends Enum<E>> boolean isValidEnumIgnoreCase(final Class<E> enumClass, final String enumName) {
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return getEnumIgnoreCase(enumClass, enumName) != null;
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}
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/**
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* This constructor is public to permit tools that require a JavaBean instance
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* to operate.
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*/
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public EnumUtils() {
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}
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}
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