| /* |
| * Lisensed 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. |
| */ |
| |
| package org.apache.tajo.schema; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Function; |
| import com.google.common.collect.Collections2; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Iterables; |
| import org.apache.tajo.common.ProtoObject; |
| import org.apache.tajo.common.TajoDataTypes.IdentifierProto; |
| import org.apache.tajo.common.TajoDataTypes.QualifiedIdentifierProto; |
| import org.apache.tajo.util.StringUtils; |
| |
| import javax.annotation.Nullable; |
| import java.util.Collection; |
| import java.util.Objects; |
| |
| import static org.apache.tajo.schema.IdentifierPolicy.DefaultPolicy; |
| |
| /** |
| * Represents a qualified identifier. In other words, it represents identifiers for |
| * all kinds of of database objects, such as databases, tables, and columns. |
| */ |
| public class QualifiedIdentifier implements ProtoObject<QualifiedIdentifierProto> { |
| private ImmutableList<Identifier> names; |
| |
| private QualifiedIdentifier(Collection<Identifier> names) { |
| this.names = ImmutableList.copyOf(names); |
| } |
| |
| /** |
| * Return a raw string representation for an identifier, which is equivalent to ones used in SQL statements. |
| * |
| * @param policy IdentifierPolicy |
| * @return Raw identifier string |
| */ |
| public String raw(final IdentifierPolicy policy) { |
| return StringUtils.join(names, "" + policy.getIdentifierSeperator(), new Function<Identifier, String>() { |
| @Override |
| public String apply(@Nullable Identifier identifier) { |
| return identifier.raw(policy); |
| } |
| }); |
| } |
| |
| public String interned() { |
| return interned(DefaultPolicy()); |
| } |
| |
| /** |
| * Raw string of qualified identifier |
| * @param policy Identifier Policy |
| * @return raw string |
| */ |
| public String interned(final IdentifierPolicy policy) { |
| return StringUtils.join(names, "" + policy.getIdentifierSeperator(), new Function<Identifier, String>() { |
| @Override |
| public String apply(@Nullable Identifier identifier) { |
| return identifier.interned(policy); |
| } |
| }); |
| } |
| |
| @Override |
| public String toString() { |
| return interned(DefaultPolicy()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(names); |
| } |
| |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof QualifiedIdentifier) { |
| QualifiedIdentifier other = (QualifiedIdentifier) obj; |
| return names.equals(other.names); |
| } |
| |
| return false; |
| } |
| |
| public static QualifiedIdentifier $(Collection<Identifier> names) { |
| return new QualifiedIdentifier(ImmutableList.copyOf(names)); |
| } |
| |
| public static QualifiedIdentifier $(Identifier...names) { |
| return new QualifiedIdentifier(ImmutableList.copyOf(names)); |
| } |
| |
| public static QualifiedIdentifier fromProto(QualifiedIdentifierProto proto) { |
| Collection<Identifier> ids = Collections2.transform(proto.getNamesList(), new Function<IdentifierProto, Identifier>() { |
| @Override |
| public Identifier apply(@Nullable IdentifierProto identifierProto) { |
| return Identifier.fromProto(identifierProto); |
| } |
| }); |
| return new QualifiedIdentifier(ids); |
| } |
| |
| /** |
| * It takes interned strings. It assumes all parameters already stripped. It is used only for tests. |
| * @param names interned strings |
| * @return QualifiedIdentifier |
| */ |
| @VisibleForTesting |
| public static QualifiedIdentifier $(String...names) { |
| final ImmutableList.Builder<Identifier> builder = ImmutableList.builder(); |
| for (String n : names) { |
| for (String split : n.split(StringUtils.escapeRegexp(""+DefaultPolicy().getIdentifierSeperator()))) { |
| builder.add(Identifier._(split, IdentifierUtil.isShouldBeQuoted(split))); |
| } |
| } |
| return new QualifiedIdentifier(builder.build()); |
| } |
| |
| @Override |
| public QualifiedIdentifierProto getProto() { |
| return QualifiedIdentifierProto.newBuilder() |
| .addAllNames(Iterables.transform(names, new Function<Identifier, IdentifierProto>() { |
| @Override |
| public IdentifierProto apply(@Nullable Identifier identifier) { |
| return identifier.getProto(); |
| } |
| })) |
| .build(); |
| } |
| } |