93 lines
3.9 KiB
Java
93 lines
3.9 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.messaging.datamodel;
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import android.telephony.SmsMessage;
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import com.android.messaging.sms.MmsConfig;
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public class MessageTextStats {
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private boolean mMessageLengthRequiresMms;
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private int mMessageCount;
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private int mCodePointsRemainingInCurrentMessage;
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public MessageTextStats() {
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mCodePointsRemainingInCurrentMessage = Integer.MAX_VALUE;
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}
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public int getNumMessagesToBeSent() {
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return mMessageCount;
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}
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public int getCodePointsRemainingInCurrentMessage() {
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return mCodePointsRemainingInCurrentMessage;
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}
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public boolean getMessageLengthRequiresMms() {
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return mMessageLengthRequiresMms;
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}
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public void updateMessageTextStats(final int selfSubId, final String messageText) {
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final int[] params = SmsMessage.calculateLength(messageText, false);
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/* SmsMessage.calculateLength returns an int[4] with:
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* int[0] being the number of SMS's required,
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* int[1] the number of code points used,
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* int[2] is the number of code points remaining until the next message.
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* int[3] is the encoding type that should be used for the message.
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*/
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mMessageCount = params[0];
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mCodePointsRemainingInCurrentMessage = params[2];
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final MmsConfig mmsConfig = MmsConfig.get(selfSubId);
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if (!mmsConfig.getMultipartSmsEnabled() &&
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!mmsConfig.getSendMultipartSmsAsSeparateMessages()) {
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// The provider doesn't support multi-part sms's and we should use MMS to
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// send multi-part sms, so as soon as the user types
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// an sms longer than one segment, we have to turn the message into an mms.
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mMessageLengthRequiresMms = mMessageCount > 1;
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} else {
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final int threshold = mmsConfig.getSmsToMmsTextThreshold();
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mMessageLengthRequiresMms = threshold > 0 && mMessageCount > threshold;
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}
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// Some carriers require any SMS message longer than 80 to be sent as MMS
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// see b/12122333
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int smsToMmsLengthThreshold = mmsConfig.getSmsToMmsTextLengthThreshold();
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if (smsToMmsLengthThreshold > 0) {
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final int usedInCurrentMessage = params[1];
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/*
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* A little hacky way to find out if we should count characters in double bytes.
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* SmsMessage.calculateLength counts message code units based on the characters
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* in input. If all of them are ascii, the max length is
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* SmsMessage.MAX_USER_DATA_SEPTETS (160). If any of them are double-byte, like
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* Korean or Chinese, the max length is SmsMessage.MAX_USER_DATA_BYTES (140) bytes
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* (70 code units).
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* Here we check if the total code units we can use is smaller than 140. If so,
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* we know we should count threshold in double-byte, so divide the threshold by 2.
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* In this way, we will count Korean text correctly with regard to the length threshold.
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*/
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if (usedInCurrentMessage + mCodePointsRemainingInCurrentMessage
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< SmsMessage.MAX_USER_DATA_BYTES) {
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smsToMmsLengthThreshold /= 2;
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}
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if (usedInCurrentMessage > smsToMmsLengthThreshold) {
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mMessageLengthRequiresMms = true;
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}
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}
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}
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}
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