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/*
* Copyright (C) 2015 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.
*/
package com.android.messaging.datamodel;
import android.telephony.SmsMessage;
import com.android.messaging.sms.MmsConfig;
public class MessageTextStats {
private boolean mMessageLengthRequiresMms;
private int mMessageCount;
private int mCodePointsRemainingInCurrentMessage;
public MessageTextStats() {
mCodePointsRemainingInCurrentMessage = Integer.MAX_VALUE;
}
public int getNumMessagesToBeSent() {
return mMessageCount;
}
public int getCodePointsRemainingInCurrentMessage() {
return mCodePointsRemainingInCurrentMessage;
}
public boolean getMessageLengthRequiresMms() {
return mMessageLengthRequiresMms;
}
public void updateMessageTextStats(final int selfSubId, final String messageText) {
final int[] params = SmsMessage.calculateLength(messageText, false);
/* SmsMessage.calculateLength returns an int[4] with:
* int[0] being the number of SMS's required,
* int[1] the number of code points used,
* int[2] is the number of code points remaining until the next message.
* int[3] is the encoding type that should be used for the message.
*/
mMessageCount = params[0];
mCodePointsRemainingInCurrentMessage = params[2];
final MmsConfig mmsConfig = MmsConfig.get(selfSubId);
if (!mmsConfig.getMultipartSmsEnabled() &&
!mmsConfig.getSendMultipartSmsAsSeparateMessages()) {
// The provider doesn't support multi-part sms's and we should use MMS to
// send multi-part sms, so as soon as the user types
// an sms longer than one segment, we have to turn the message into an mms.
mMessageLengthRequiresMms = mMessageCount > 1;
} else {
final int threshold = mmsConfig.getSmsToMmsTextThreshold();
mMessageLengthRequiresMms = threshold > 0 && mMessageCount > threshold;
}
// Some carriers require any SMS message longer than 80 to be sent as MMS
// see b/12122333
int smsToMmsLengthThreshold = mmsConfig.getSmsToMmsTextLengthThreshold();
if (smsToMmsLengthThreshold > 0) {
final int usedInCurrentMessage = params[1];
/*
* A little hacky way to find out if we should count characters in double bytes.
* SmsMessage.calculateLength counts message code units based on the characters
* in input. If all of them are ascii, the max length is
* SmsMessage.MAX_USER_DATA_SEPTETS (160). If any of them are double-byte, like
* Korean or Chinese, the max length is SmsMessage.MAX_USER_DATA_BYTES (140) bytes
* (70 code units).
* Here we check if the total code units we can use is smaller than 140. If so,
* we know we should count threshold in double-byte, so divide the threshold by 2.
* In this way, we will count Korean text correctly with regard to the length threshold.
*/
if (usedInCurrentMessage + mCodePointsRemainingInCurrentMessage
< SmsMessage.MAX_USER_DATA_BYTES) {
smsToMmsLengthThreshold /= 2;
}
if (usedInCurrentMessage > smsToMmsLengthThreshold) {
mMessageLengthRequiresMms = true;
}
}
}
}
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