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;

import java.util.Arrays;
import java.util.Collection;

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(final String... values) {
        if (values == null) {
            return true;
        }
        return containsOnlyAlphaDigitHyphen(Arrays.asList(values));
    }

    public static boolean containsOnlyAlphaDigitHyphen(final Collection<String> values) {
        if (values == null) {
            return true;
        }
        final int upperAlphabetFirst = 0x41; // A
        final int upperAlphabetAfterLast = 0x5b; // [
        final int lowerAlphabetFirst = 0x61; // a
        final int lowerAlphabetAfterLast = 0x7b; // {
        final int digitFirst = 0x30; // 0
        final int digitAfterLast = 0x3A; // :
        final int hyphen = '-';
        for (final String str : values) {
            if (TextUtils.isEmpty(str)) {
                continue;
            }
            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 < lowerAlphabetAfterLast)
                        || (upperAlphabetFirst <= codepoint && codepoint < upperAlphabetAfterLast)
                        || (digitFirst <= codepoint && codepoint < digitAfterLast) || (codepoint == hyphen))) {
                    return false;
                }
            }
        }
        return true;
    }
}