    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.text;
    018
    019/**
    020 * <p>
    021 * Commonly used implementations of {@link CharacterPredicate}. Per the interface
    022 * requirements, all implementations are thread safe.
    023 * </p>
    024 *
    025 * @since 1.0
    026 */
    027public enum CharacterPredicates implements CharacterPredicate {
    028
    029    /**
    030     * Tests code points against {@link Character#isLetter(int)}.
    031     *
    032     * @since 1.0
    033     */
    034    LETTERS {
    035        @Override
    036        public boolean test(final int codePoint) {
    037            return Character.isLetter(codePoint);
    038        }
    039    },
    040
    041    /**
    042     * Tests code points against {@link Character#isDigit(int)}.
    043     *
    044     * @since 1.0
    045     */
    046    DIGITS {
    047        @Override
    048        public boolean test(final int codePoint) {
    049            return Character.isDigit(codePoint);
    050        }
    051    },
    052
    053    /**
    054     * Tests if the code points represents a number between 0 and 9.
    055     *
    056     * @since 1.2
    057     */
    058    ARABIC_NUMERALS {
    059        @Override
    060        public boolean test(final int codePoint) {
    061            return codePoint >= '0' && codePoint <= '9';
    062        }
    063    },
    064
    065    /**
    066     * Tests if the code points represents a letter between a and z.
    067     *
    068     * @since 1.2
    069     */
    070    ASCII_LOWERCASE_LETTERS {
    071        @Override
    072        public boolean test(final int codePoint) {
    073            return codePoint >= 'a' && codePoint <= 'z';
    074        }
    075    },
    076
    077    /**
    078     * Tests if the code points represents a letter between A and Z.
    079     *
    080     * @since 1.2
    081     */
    082    ASCII_UPPERCASE_LETTERS {
    083        @Override
    084        public boolean test(final int codePoint) {
    085            return codePoint >= 'A' && codePoint <= 'Z';
    086        }
    087    },
    088
    089    /**
    090     * Tests if the code points represents a letter between a and Z.
    091     *
    092     * @since 1.2
    093     */
    094    ASCII_LETTERS {
    095        @Override
    096        public boolean test(final int codePoint) {
    097            return ASCII_LOWERCASE_LETTERS.test(codePoint) || ASCII_UPPERCASE_LETTERS.test(codePoint);
    098        }
    099    },
    100
    101    /**
    102     * Tests if the code points represents a letter between a and Z or a number between 0 and 9.
    103     *
    104     * @since 1.2
    105     */
    106    ASCII_ALPHA_NUMERALS {
    107        @Override
    108        public boolean test(final int codePoint) {
    109            return ASCII_LOWERCASE_LETTERS.test(codePoint) || ASCII_UPPERCASE_LETTERS.test(codePoint)
    110                    || ARABIC_NUMERALS.test(codePoint);
    111        }
    112    }
    113}