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/*
* Copyright (C) 2018 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.dialer.precall.impl;
import android.content.Context;
import android.telephony.PhoneNumberUtils;
import com.android.dialer.common.LogUtil;
import com.android.dialer.configprovider.ConfigProviderBindings;
import com.android.dialer.precall.impl.MalformedNumberRectifier.MalformedNumberHandler;
import com.google.common.base.Optional;
/**
* It is customary in UK to present numbers as "+44 (0) xx xxxx xxxx". This is actually a amalgam of
* international (+44 xx xxxx xxxx) and regional (0xx xxxx xxxx) format, and is in fact invalid. It
* might be rejected depending on the carrier.
*
* <p>This class removes the "0" region code prefix if the first dialable digits are "+440". UK
* short codes and region codes in international format will never start with a 0.
*/
class UkRegionPrefixInInternationalFormatHandler implements MalformedNumberHandler {
private static final String MALFORMED_PREFIX = "+440";
@Override
public Optional<String> handle(Context context, String number) {
if (!ConfigProviderBindings.get(context)
.getBoolean("uk_region_prefix_in_international_format_fix_enabled", true)) {
return Optional.absent();
}
if (!PhoneNumberUtils.normalizeNumber(number).startsWith(MALFORMED_PREFIX)) {
return Optional.absent();
}
LogUtil.i("UkRegionPrefixInInternationalFormatHandler.handle", "removing (0) in UK numbers");
// libPhoneNumber is not used because we want to keep post dial digits, and this is on the main
// thread.
String convertedNumber = PhoneNumberUtils.convertKeypadLettersToDigits(number);
StringBuilder result = new StringBuilder();
int prefixPosition = 0;
for (int i = 0; i < convertedNumber.length(); i++) {
char c = convertedNumber.charAt(i);
if (c != MALFORMED_PREFIX.charAt(prefixPosition)) {
result.append(c);
continue;
}
prefixPosition++;
if (prefixPosition == MALFORMED_PREFIX.length()) {
result.append(convertedNumber.substring(i + 1));
break;
}
result.append(c);
}
return Optional.of(result.toString());
}
}
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