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[FLINK-14490][table-api] Introduce UnresolvedIdentifier
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127 changes: 127 additions & 0 deletions
127
...ink-table-api-java/src/main/java/org/apache/flink/table/catalog/UnresolvedIdentifier.java
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| @@ -0,0 +1,127 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
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| package org.apache.flink.table.catalog; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.table.api.ValidationException; | ||
| import org.apache.flink.table.utils.EncodingUtils; | ||
| import org.apache.flink.util.Preconditions; | ||
| import org.apache.flink.util.StringUtils; | ||
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| import javax.annotation.Nullable; | ||
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| import java.util.Arrays; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.Stream; | ||
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| /** | ||
| * Identifier of an object, such as table, view, function or type in a catalog. This identifier | ||
| * cannot be used directly to access an object in a {@link CatalogManager}, but has to be first | ||
| * fully resolved into {@link ObjectIdentifier}. | ||
| */ | ||
| @Internal | ||
| public class UnresolvedIdentifier { | ||
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| private final String catalogName; | ||
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| private final String databaseName; | ||
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| private final String objectName; | ||
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| /** | ||
| * Constructs an {@link UnresolvedIdentifier} from an array of identifier segments. | ||
| * The length of the path must be between 1 (only object name) and 3 (fully qualified | ||
| * identifier with catalog, database and object name). | ||
| * | ||
| * @param path array of identifier segments | ||
| * @return an identifier that must be resolved before accessing an object from a {@link CatalogManager} | ||
| */ | ||
| public static UnresolvedIdentifier of(String... path) { | ||
| if (path == null) { | ||
| throw new ValidationException("Object identifier can not be null!"); | ||
| } | ||
| if (path.length < 1 || path.length > 3) { | ||
| throw new ValidationException("Object identifier must consist of 1 to 3 parts."); | ||
| } | ||
| if (Arrays.stream(path).anyMatch(StringUtils::isNullOrWhitespaceOnly)) { | ||
| throw new ValidationException("Parts of the object identifier are null or whitespace-only."); | ||
| } | ||
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| if (path.length == 3) { | ||
| return new UnresolvedIdentifier(path[0], path[1], path[2]); | ||
| } else if (path.length == 2) { | ||
| return new UnresolvedIdentifier(null, path[0], path[1]); | ||
| } else { | ||
| return new UnresolvedIdentifier(null, null, path[0]); | ||
| } | ||
| } | ||
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| private UnresolvedIdentifier( | ||
| @Nullable String catalogName, | ||
| @Nullable String databaseName, | ||
| String objectName) { | ||
| this.catalogName = catalogName; | ||
| this.databaseName = databaseName; | ||
| this.objectName = Preconditions.checkNotNull(objectName, "Object name must not be null."); | ||
| } | ||
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| public Optional<String> getCatalogName() { | ||
| return Optional.ofNullable(catalogName); | ||
| } | ||
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| public Optional<String> getDatabaseName() { | ||
| return Optional.ofNullable(databaseName); | ||
| } | ||
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| public String getObjectName() { | ||
| return objectName; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| UnresolvedIdentifier that = (UnresolvedIdentifier) o; | ||
| return catalogName.equals(that.catalogName) && | ||
| databaseName.equals(that.databaseName) && | ||
| objectName.equals(that.objectName); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(catalogName, databaseName, objectName); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return Stream.of( | ||
| catalogName, | ||
| databaseName, | ||
| objectName | ||
| ).filter(Objects::nonNull) | ||
| .map(EncodingUtils::escapeIdentifier) | ||
| .collect(Collectors.joining(".")); | ||
| } | ||
| } |
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