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This module contains the Table/SQL API for writing table programs within the table ecosystem using the Java programming language.
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/*
 * 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.flink.table.api.internal;

import org.apache.flink.annotation.Experimental;
import org.apache.flink.annotation.Internal;
import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.table.api.CompiledPlan;
import org.apache.flink.table.api.ExplainDetail;
import org.apache.flink.table.api.ExplainFormat;
import org.apache.flink.table.api.StatementSet;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.TableDescriptor;
import org.apache.flink.table.api.TableException;
import org.apache.flink.table.api.TablePipeline;
import org.apache.flink.table.api.TableResult;
import org.apache.flink.table.operations.ModifyOperation;
import org.apache.flink.table.operations.Operation;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/** Implementation for {@link StatementSet}. */
@Internal
public class StatementSetImpl implements StatementSet {
    protected final E tableEnvironment;
    protected final List operations = new ArrayList<>();

    protected StatementSetImpl(E tableEnvironment) {
        this.tableEnvironment = tableEnvironment;
    }

    @VisibleForTesting
    public List getOperations() {
        return operations;
    }

    @Override
    public StatementSet add(TablePipeline tablePipeline) {
        operations.add(((TablePipelineImpl) tablePipeline).getOperation());
        return this;
    }

    @Override
    public StatementSet addInsertSql(String statement) {
        List operations = tableEnvironment.getParser().parse(statement);

        if (operations.size() != 1) {
            throw new TableException("Only single statement is supported.");
        }

        Operation operation = operations.get(0);
        if (operation instanceof ModifyOperation) {
            this.operations.add((ModifyOperation) operation);
        } else {
            throw new TableException("Only insert statement is supported now.");
        }
        return this;
    }

    @Override
    public StatementSet addInsert(String targetPath, Table table) {
        return add(table.insertInto(targetPath));
    }

    @Override
    public StatementSet addInsert(String targetPath, Table table, boolean overwrite) {
        return add(table.insertInto(targetPath, overwrite));
    }

    @Override
    public StatementSet addInsert(TableDescriptor targetDescriptor, Table table) {
        return add(table.insertInto(targetDescriptor));
    }

    @Override
    public StatementSet addInsert(
            TableDescriptor targetDescriptor, Table table, boolean overwrite) {
        return add(table.insertInto(targetDescriptor, overwrite));
    }

    @Override
    public String explain(ExplainFormat format, ExplainDetail... extraDetails) {
        List operationList =
                operations.stream().map(o -> (Operation) o).collect(Collectors.toList());
        return tableEnvironment.explainInternal(operationList, format, extraDetails);
    }

    @Override
    public TableResult execute() {
        try {
            return tableEnvironment.executeInternal(operations);
        } finally {
            operations.clear();
        }
    }

    @Experimental
    public CompiledPlan compilePlan() {
        return tableEnvironment.compilePlan(operations);
    }
}