| /* |
| * 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. |
| */ |
| package org.apache.cassandra.cql3; |
| |
| import java.util.List; |
| import java.util.Objects; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| import org.antlr.runtime.RecognitionException; |
| import org.apache.cassandra.cql3.restrictions.CustomIndexExpression; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| |
| import static java.lang.String.join; |
| |
| import static com.google.common.collect.Iterables.concat; |
| import static com.google.common.collect.Iterables.transform; |
| |
| public final class WhereClause |
| { |
| private static final WhereClause EMPTY = new WhereClause(new Builder()); |
| |
| public final List<Relation> relations; |
| public final List<CustomIndexExpression> expressions; |
| |
| private WhereClause(Builder builder) |
| { |
| relations = builder.relations.build(); |
| expressions = builder.expressions.build(); |
| } |
| |
| public static WhereClause empty() |
| { |
| return EMPTY; |
| } |
| |
| public boolean containsCustomExpressions() |
| { |
| return !expressions.isEmpty(); |
| } |
| |
| /** |
| * Renames identifiers in all relations |
| * @param from the old identifier |
| * @param to the new identifier |
| * @return a new WhereClause with with "from" replaced by "to" in all relations |
| */ |
| public WhereClause renameIdentifier(ColumnIdentifier from, ColumnIdentifier to) |
| { |
| WhereClause.Builder builder = new WhereClause.Builder(); |
| |
| relations.stream() |
| .map(r -> r.renameIdentifier(from, to)) |
| .forEach(builder::add); |
| |
| expressions.forEach(builder::add); |
| |
| return builder.build(); |
| } |
| |
| public static WhereClause parse(String cql) throws RecognitionException |
| { |
| return CQLFragmentParser.parseAnyUnhandled(CqlParser::whereClause, cql).build(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return toCQLString(); |
| } |
| |
| /** |
| * Returns a CQL representation of this WHERE clause. |
| * |
| * @return a CQL representation of this WHERE clause |
| */ |
| public String toCQLString() |
| { |
| return join(" AND ", |
| concat(transform(relations, Relation::toCQLString), |
| transform(expressions, CustomIndexExpression::toCQLString))); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) |
| return true; |
| |
| if (!(o instanceof WhereClause)) |
| return false; |
| |
| WhereClause wc = (WhereClause) o; |
| return relations.equals(wc.relations) && expressions.equals(wc.expressions); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hash(relations, expressions); |
| } |
| |
| /** |
| * Checks if the where clause contains some token relations. |
| * |
| * @return {@code true} if it is the case, {@code false} otherwise. |
| */ |
| public boolean containsTokenRelations() |
| { |
| for (Relation rel : relations) |
| { |
| if (rel.onToken()) |
| return true; |
| } |
| return false; |
| } |
| |
| public static final class Builder |
| { |
| ImmutableList.Builder<Relation> relations = new ImmutableList.Builder<>(); |
| ImmutableList.Builder<CustomIndexExpression> expressions = new ImmutableList.Builder<>(); |
| |
| public Builder add(Relation relation) |
| { |
| relations.add(relation); |
| return this; |
| } |
| |
| public Builder add(CustomIndexExpression expression) |
| { |
| expressions.add(expression); |
| return this; |
| } |
| |
| public WhereClause build() |
| { |
| return new WhereClause(this); |
| } |
| } |
| } |