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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.operations;

import org.apache.flink.annotation.Internal;
import org.apache.flink.table.api.TableSchema;
import org.apache.flink.table.sources.TableSource;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Inline scan of a {@link TableSource}. Used only when a {@link org.apache.flink.table.api.Table} was created
 * from {@link org.apache.flink.table.api.TableEnvironment#fromTableSource(TableSource)}.
 */
@Internal
public class TableSourceQueryOperation implements QueryOperation {

	private final TableSource tableSource;
	// Flag that tells if the tableSource is BatchTableSource.
	private final boolean isBatch;

	public TableSourceQueryOperation(TableSource tableSource, boolean isBatch) {
		this.tableSource = tableSource;
		this.isBatch = isBatch;
	}

	@Override
	public TableSchema getTableSchema() {
		return tableSource.getTableSchema();
	}

	@Override
	public String asSummaryString() {
		Map args = new HashMap<>();
		args.put("fields", tableSource.getTableSchema().getFieldNames());

		return OperationUtils.formatWithChildren("TableSource", args, getChildren(), Operation::asSummaryString);
	}

	public TableSource getTableSource() {
		return tableSource;
	}

	public boolean isBatch() {
		return isBatch;
	}

	@Override
	public List getChildren() {
		return Collections.emptyList();
	}

	@Override
	public  R accept(QueryOperationVisitor visitor) {
		return visitor.visit(this);
	}
}