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BigQuerySchemaUtil.java
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BigQuerySchemaUtil.java
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/*
* Copyright 2022 Google LLC
*
* 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
*
* https://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.cloud.bigquery.storage.v1;
import com.google.protobuf.Descriptors.FieldDescriptor;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.regex.Pattern;
public class BigQuerySchemaUtil {
private static final String PROTO_COMPATIBLE_NAME_REGEXP = "[A-Za-z_][A-Za-z0-9_]*";
private static final String PLACEHOLDER_FILED_NAME_PREFIX = "col_";
private static final Pattern PROTO_COMPATIBLE_NAME_PATTERN =
Pattern.compile(PROTO_COMPATIBLE_NAME_REGEXP);
/**
* * Checks if the field name is compatible with proto field naming convention.
*
* @param fieldName name for the field
* @return true if the field name is comptaible with proto naming convention, otherwise, returns
* false.
*/
public static boolean isProtoCompatible(String fieldName) {
return PROTO_COMPATIBLE_NAME_PATTERN.matcher(fieldName).matches();
}
/**
* * Generates a placeholder name that consists of a prefix + base64 encoded field name. We
* replace all dashes with underscores as they are not allowed for proto field names.
*
* @param fieldName name for the field
* @return the generated placeholder field name
*/
public static String generatePlaceholderFieldName(String fieldName) {
return PLACEHOLDER_FILED_NAME_PREFIX
+ Base64.getUrlEncoder()
.withoutPadding()
.encodeToString(fieldName.getBytes(StandardCharsets.UTF_8))
.replace('-', '_');
}
/**
* * Gets the user-facing field name from the descriptor
*
* @param fieldDescriptor
* @return columnName annotation if present, otherwise return the field name.
*/
public static String getFieldName(FieldDescriptor fieldDescriptor) {
return fieldDescriptor.getOptions().hasExtension(AnnotationsProto.columnName)
? fieldDescriptor.getOptions().getExtension(AnnotationsProto.columnName)
: fieldDescriptor.getName();
}
}