Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed 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.
 */

import android.text.TextUtils;

public class Main {
    /**
     * This is useful since vCard 3.0 often requires the ("X-") properties and groups
     * should contain only alphabets, digits, and hyphen.
     * 
     * Note: It is already known some devices (wrongly) outputs properties with characters
     *       which should not be in the field. One example is "X-GOOGLE TALK". We accept
     *       such kind of input but must never output it unless the target is very specific
     *       to the device which is able to parse the malformed input. 
     */
    public static boolean containsOnlyAlphaDigitHyphen(String str) {
        if (TextUtils.isEmpty(str)) {
            return true;
        }

        final int lowerAlphabetFirst = 0x41; // included ('A')
        final int lowerAlphabetLast = 0x5b; // not included ('[')
        final int upperAlphabetFirst = 0x61; // included ('a')
        final int upperAlphabetLast = 0x7b; // included ('{')
        final int digitFirst = 0x30; // included ('0')
        final int digitLast = 0x39; // included ('9')
        final int hyphen = '-';
        final int length = str.length();
        for (int i = 0; i < length; i = str.offsetByCodePoints(i, 1)) {
            int codepoint = str.codePointAt(i);
            if (!((lowerAlphabetFirst <= codepoint && codepoint < lowerAlphabetLast)
                    || (upperAlphabetFirst <= codepoint && codepoint < upperAlphabetLast)
                    || (digitFirst <= codepoint && codepoint < digitLast) || (codepoint == hyphen))) {
                return false;
            }
        }
        return true;
    }
}