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MyBatis framework for generating dynamic SQL
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/*
 *    Copyright 2016-2024 the original author or authors.
 *
 *    Licensed 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
 *
 *       https://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.mybatis.dynamic.sql.insert;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Objects;

import org.jetbrains.annotations.NotNull;
import org.mybatis.dynamic.sql.SqlColumn;
import org.mybatis.dynamic.sql.SqlTable;
import org.mybatis.dynamic.sql.util.AbstractColumnMapping;
import org.mybatis.dynamic.sql.util.Buildable;
import org.mybatis.dynamic.sql.util.ConstantMapping;
import org.mybatis.dynamic.sql.util.NullMapping;
import org.mybatis.dynamic.sql.util.PropertyMapping;
import org.mybatis.dynamic.sql.util.RowMapping;
import org.mybatis.dynamic.sql.util.StringConstantMapping;

public class MultiRowInsertDSL implements Buildable> {

    private final Collection records;
    private final SqlTable table;
    private final List columnMappings;

    private MultiRowInsertDSL(BatchInsertDSL.AbstractBuilder builder) {
        this.records = builder.records;
        this.table = Objects.requireNonNull(builder.table);
        this.columnMappings = builder.columnMappings;
    }

    public  ColumnMappingFinisher map(SqlColumn column) {
        return new ColumnMappingFinisher<>(column);
    }

    @NotNull
    @Override
    public MultiRowInsertModel build() {
        return MultiRowInsertModel.withRecords(records)
                .withTable(table)
                .withColumnMappings(columnMappings)
                .build();
    }

    @SafeVarargs
    public static  IntoGatherer insert(T... records) {
        return MultiRowInsertDSL.insert(Arrays.asList(records));
    }

    public static  IntoGatherer insert(Collection records) {
        return new IntoGatherer<>(records);
    }

    public static class IntoGatherer {
        private final Collection records;

        private IntoGatherer(Collection records) {
            this.records = records;
        }

        public MultiRowInsertDSL into(SqlTable table) {
            return new Builder().withRecords(records).withTable(table).build();
        }
    }

    public class ColumnMappingFinisher {
        private final SqlColumn column;

        public ColumnMappingFinisher(SqlColumn column) {
            this.column = column;
        }

        public MultiRowInsertDSL toProperty(String property) {
            columnMappings.add(PropertyMapping.of(column, property));
            return MultiRowInsertDSL.this;
        }

        public MultiRowInsertDSL toNull() {
            columnMappings.add(NullMapping.of(column));
            return MultiRowInsertDSL.this;
        }

        public MultiRowInsertDSL toConstant(String constant) {
            columnMappings.add(ConstantMapping.of(column, constant));
            return MultiRowInsertDSL.this;
        }

        public MultiRowInsertDSL toStringConstant(String constant) {
            columnMappings.add(StringConstantMapping.of(column, constant));
            return MultiRowInsertDSL.this;
        }

        public MultiRowInsertDSL toRow() {
            columnMappings.add(RowMapping.of(column));
            return MultiRowInsertDSL.this;
        }
    }

    public static class Builder extends BatchInsertDSL.AbstractBuilder> {

        @Override
        protected Builder getThis() {
            return this;
        }

        public MultiRowInsertDSL build() {
            return new MultiRowInsertDSL<>(this);
        }
    }
}