Java tutorial
/* * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor * license agreements. See the NOTICE file distributed with this work for * additional information regarding copyright ownership. Crate 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. * * However, if you have executed another commercial license agreement * with Crate these terms will supersede the license and you may use the * software solely pursuant to the terms of the relevant commercial agreement. */ package io.crate.operation.reference.information; import com.google.common.collect.ImmutableMap; import io.crate.metadata.ReferenceIdent; import io.crate.metadata.ReferenceInfo; import io.crate.metadata.information.RowCollectExpression; import io.crate.operation.reference.DocLevelReferenceResolver; import org.elasticsearch.common.inject.Inject; import org.elasticsearch.common.inject.Singleton; @Singleton public class InformationDocLevelReferenceResolver implements DocLevelReferenceResolver<RowCollectExpression<?, ?>> { private final ImmutableMap<ReferenceIdent, RowCollectExpression<?, ?>> implementations; @Inject public InformationDocLevelReferenceResolver() { ImmutableMap.Builder<ReferenceIdent, RowCollectExpression<?, ?>> builder = ImmutableMap.builder(); // information_schema.tables add(builder, InformationTablesExpression.SCHEMA_NAME_EXPRESSION); add(builder, InformationTablesExpression.TABLE_NAME_EXPRESSION); add(builder, InformationTablesExpression.NUMBER_OF_SHARDS_EXPRESSION); add(builder, InformationTablesExpression.NUMBER_OF_REPLICAS_EXPRESSION); add(builder, InformationTablesExpression.CLUSTERED_BY_EXPRESSION); add(builder, InformationTablesExpression.PARTITION_BY_EXPRESSION); add(builder, InformationTablesExpression.BLOB_PATH_EXPRESSION); // information_schema.columns add(builder, InformationColumnsExpression.SCHEMA_NAME_EXPRESSION); add(builder, InformationColumnsExpression.TABLE_NAME_EXPRESSION); add(builder, InformationColumnsExpression.COLUMN_NAME_EXPRESSION); add(builder, InformationColumnsExpression.ORDINAL_EXPRESSION); add(builder, InformationColumnsExpression.DATA_TYPE_EXPRESSION); // information_schema.table_partitions add(builder, InformationTablePartitionsExpression.TABLE_NAME_EXPRESSION); add(builder, InformationTablePartitionsExpression.SCHEMA_NAME_EXPRESSION); add(builder, InformationTablePartitionsExpression.PARTITION_IDENT_EXPRESSION); add(builder, InformationTablePartitionsExpression.VALUES_EXPRESSION); // information_schema.table_constraints add(builder, InformationTableConstraintsExpression.SCHEMA_NAME_EXPRESSION); add(builder, InformationTableConstraintsExpression.TABLE_NAME_EXPRESSION); add(builder, InformationTableConstraintsExpression.CONSTRAINT_NAME_EXPRESSION); add(builder, InformationTableConstraintsExpression.CONSTRAINT_TYPE_EXPRESSION); // information_schema.routines add(builder, InformationRoutinesExpression.ROUTINE_NAME_EXPRESSION); add(builder, InformationRoutinesExpression.ROUTINE_TYPE_EXPRESSION); implementations = builder.build(); } private static void add(ImmutableMap.Builder<ReferenceIdent, RowCollectExpression<?, ?>> builder, RowCollectExpression<?, ?> expression) { builder.put(expression.info().ident(), expression); } @Override public RowCollectExpression<?, ?> getImplementation(ReferenceInfo info) { return implementations.get(info.ident()); } }