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This SDK contains methods for using SMS Messaging API, Delivery report API, Pricing API and Credits
API.
/*
* Copyright 2016 Messente Communications Ltd.
*
* 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.
*/
package com.messente.sdk.utils;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/**
* SMS length calculator.
*
* SMS length calculation class that detects if the message can be sent in GSM
* charset or UCS-2 must be used. Also takes care of trailing escape character
* if a message is split on extended character.
*
* @see
* http://messente.com/documentation/sms-length-calculator
*
* @author Jaanus Rõõmus
*/
public class SmsLengthCalculator {
private final int GSM_CHARSET_7BIT = 0;
private final int GSM_CHARSET_UNICODE = 2;
private final char GSM_7BIT_ESC = '\u001b';
/**
* List of all characters supported by GSM charset.
*/
private final Set GSM7BIT = new HashSet<>(Arrays.asList(
new String[]{
"@", "£", "$", "¥", "è", "é", "ù", "ì", "ò", "Ç", "\n", "Ø", "ø", "\r", "Å", "å",
"Δ", "_", "Φ", "Γ", "Λ", "Ω", "Π", "Ψ", "Σ", "Θ", "Ξ", "\u001b", "Æ", "æ", "ß", "É",
" ", "!", "'", "#", "¤", "%", "&", "\"", "(", ")", "*", "+", ",", "-", ".", "/",
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ":", ";", "<", "=", ">", "?",
"¡", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O",
"P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "Ä", "Ö", "Ñ", "Ü", "§",
"¿", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o",
"p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "ä", "ö", "ñ", "ü", "à"
}
));
/**
* Set of extended characters that must be escaped with '\u001b'.
*/
private final Set GSM7BITEXT = new HashSet<>(Arrays.asList(
new String[]{
"\f", "^", "{", "}", "\\", "[", "~", "]", "|", "€"
}
));
/**
* Gets the charset that is used in SMS text.
*
* @param content SMS text.
* @return integer type. returns 0 if all characters are present in GSM
* charset or 2 if message must be sent in Unicode (UCS-2) charset instead.
*/
public int getCharset(String content) {
for (int i = 0; i < content.length(); i++) {
if (!GSM7BIT.contains(Character.toString(content.charAt(i)))) {
if (!GSM7BITEXT.contains(Character.toString(content.charAt(i)))) {
return GSM_CHARSET_UNICODE;
}
}
}
return GSM_CHARSET_7BIT;
}
/**
* Gets SMS message parts count for SMS text that contains 7-bit characters.
*
* @param content SMS text.
* @return SMS message part count.
*/
private int getPartCount7bit(String content) {
StringBuilder content7bit = new StringBuilder();
// Add escape characters for extended charset
for (int i = 0; i < content.length(); i++) {
if (!GSM7BITEXT.contains(content.charAt(i) + "")) {
content7bit.append(content.charAt(i));
} else {
content7bit.append('\u001b');
content7bit.append(content.charAt(i));
}
}
if (content7bit.length() <= 160) {
return 1;
} else {
// Start counting the number of messages
int parts = (int) Math.ceil(content7bit.length() / 153.0);
int free_chars = content7bit.length() - (int) Math.floor(content7bit.length() / 153.0) * 153;
// We have enough free characters left, don't care about escape character at the end of sms part
if (free_chars >= parts - 1) {
return parts;
}
// Reset counter
parts = 0;
while (content7bit.length() > 0) {
// Advance sms counter
parts++;
// Check for trailing escape character
if (content7bit.length() >= 152 && content7bit.charAt(152) == GSM_7BIT_ESC) {
content7bit.delete(0, 152);
} else {
content7bit.delete(0, 153);
}
}
return parts;
}
}
/**
* Number of parts this message is split up to when sent via SMS.
*
* @param content SMS text.
*
* @return -1 If charset cannot be defined. Otherwise the number of SMS
* parts.
*/
public int getPartCount(String content) {
int charset = getCharset(content);
if (charset == GSM_CHARSET_7BIT) {
return this.getPartCount7bit(content);
} else if (charset == GSM_CHARSET_UNICODE) {
if (content.length() <= 70) {
return 1;
} else {
return (int) Math.ceil(content.length() / 67.0);
}
}
return -1;
}
/**
* Gets the SMS text character count.
*
* @param content SMS text.
* @return The character count this SMS text consists of.
*/
public int getCharacterCount(String content) {
int chars = 0;
for (int i = 0; i < content.length(); i++) {
if (GSM7BIT.contains(content.charAt(i) + "")) {
chars++;
} else if (GSM7BITEXT.contains(content.charAt(i) + "")) {
chars += 2;
} else {
chars = content.length();
break;
}
}
return chars;
}
}