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...gquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1alpha2/SchemaCompact.java
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| /* | ||
| * Copyright 2020 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 | ||
| * | ||
| * 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.cloud.bigquery.storage.v1alpha2; | ||
|
|
||
| import com.google.cloud.bigquery.BigQuery; | ||
| import com.google.cloud.bigquery.Schema; | ||
| import com.google.cloud.bigquery.Table; | ||
| import com.google.cloud.bigquery.TableId; | ||
| import com.google.cloud.bigquery.testing.RemoteBigQueryHelper; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.protobuf.Descriptors; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| /** | ||
| * A class that checks the schema compatibility between user schema in proto descriptor and Bigquery | ||
| * table schema. If this check is passed, then user can write to BigQuery table using the user | ||
| * schema, otherwise the write will fail. | ||
| * | ||
| * <p>The implementation as of now is not complete, which measn, if this check passed, there is | ||
| * still a possbility of writing will fail. | ||
| */ | ||
| public class SchemaCompact { | ||
| private BigQuery bigquery; | ||
| private static SchemaCompact compact; | ||
| private static String tablePatternString = "projects/([^/]+)/datasets/([^/]+)/tables/([^/]+)"; | ||
| private static Pattern tablePattern = Pattern.compile(tablePatternString); | ||
|
|
||
| private SchemaCompact(BigQuery bigquery) { | ||
| this.bigquery = bigquery; | ||
| } | ||
|
|
||
| /** | ||
| * Gets a singleton {code SchemaCompact} object. | ||
| * | ||
| * @return | ||
| */ | ||
| public static SchemaCompact getInstance() { | ||
| if (compact == null) { | ||
| RemoteBigQueryHelper bigqueryHelper = RemoteBigQueryHelper.create(); | ||
| compact = new SchemaCompact(bigqueryHelper.getOptions().getService()); | ||
| } | ||
| return compact; | ||
| } | ||
|
|
||
| /** | ||
| * Gets a {code SchemaCompact} object with custom BigQuery stub. | ||
| * | ||
| * @param bigquery | ||
| * @return | ||
| */ | ||
| @VisibleForTesting | ||
| public static SchemaCompact getInstance(BigQuery bigquery) { | ||
| return new SchemaCompact(bigquery); | ||
| } | ||
|
|
||
| private TableId getTableId(String tableName) { | ||
| Matcher matcher = tablePattern.matcher(tableName); | ||
| if (!matcher.matches() || matcher.groupCount() != 3) { | ||
| throw new IllegalArgumentException("Invalid table name: " + tableName); | ||
| } | ||
| return TableId.of(matcher.group(1), matcher.group(2), matcher.group(3)); | ||
| } | ||
|
|
||
| /** | ||
| * Checks if the userSchema is compatible with the table's current schema for writing. The current | ||
| * implementatoin is not complete. If the check failed, the write couldn't succeed. | ||
| * | ||
| * @param tableName The name of the table to write to. | ||
| * @param userSchema The schema user uses to append data. | ||
| * @throws IllegalArgumentException the check failed. | ||
| */ | ||
| public void check(String tableName, Descriptors.Descriptor userSchema) | ||
| throws IllegalArgumentException { | ||
| Table table = bigquery.getTable(getTableId(tableName)); | ||
| Schema schema = table.getDefinition().getSchema(); | ||
| // TODO: We only have very limited check here. More checks to be added. | ||
| if (schema.getFields().size() != userSchema.getFields().size()) { | ||
| throw new IllegalArgumentException( | ||
| "User schema doesn't have expected field number with BigQuery table schema, expected: " | ||
| + schema.getFields().size() | ||
| + " actual: " | ||
| + userSchema.getFields().size()); | ||
| } | ||
| } | ||
| } |
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