com.google.i18n.phonenumbers.metadata.source.MultiFileModeFileNameProvider Maven / Gradle / Ivy
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/*
* Copyright (C) 2022 The Libphonenumber Authors
*
* 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.google.i18n.phonenumbers.metadata.source;
/**
* {@link PhoneMetadataFileNameProvider} implementation which appends key as a suffix to the
* predefined metadata file name base.
*/
public final class MultiFileModeFileNameProvider implements PhoneMetadataFileNameProvider {
private final String phoneMetadataFileNamePrefix;
public MultiFileModeFileNameProvider(String phoneMetadataFileNameBase) {
this.phoneMetadataFileNamePrefix = phoneMetadataFileNameBase + "_";
}
@Override
public String getFor(Object key) {
String keyAsString = key.toString();
if (!isAlphanumeric(keyAsString)) {
throw new IllegalArgumentException("Invalid key: " + keyAsString);
}
return phoneMetadataFileNamePrefix + key;
}
private boolean isAlphanumeric(String key) {
if (key == null || key.length() == 0) {
return false;
}
// String#length doesn't actually return the number of
// code points in the String, it returns the number
// of char values.
int size = key.length();
for (int charIdx = 0; charIdx < size; ) {
final int codePoint = key.codePointAt(charIdx);
if (!Character.isLetterOrDigit(codePoint)) {
return false;
}
charIdx += Character.charCount(codePoint);
}
return true;
}
}