org.mybatis.dynamic.sql.update.UpdateDSL Maven / Gradle / Ivy

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/*
 *    Copyright ${license.git.copyrightYears} 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
 *
 *       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.mybatis.dynamic.sql.update;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.function.Supplier;

import org.jetbrains.annotations.NotNull;
import org.mybatis.dynamic.sql.BasicColumn;
import org.mybatis.dynamic.sql.SqlColumn;
import org.mybatis.dynamic.sql.SqlTable;
import org.mybatis.dynamic.sql.select.SelectModel;
import org.mybatis.dynamic.sql.util.AbstractColumnMapping;
import org.mybatis.dynamic.sql.util.Buildable;
import org.mybatis.dynamic.sql.util.ColumnToColumnMapping;
import org.mybatis.dynamic.sql.util.ConstantMapping;
import org.mybatis.dynamic.sql.util.NullMapping;
import org.mybatis.dynamic.sql.util.SelectMapping;
import org.mybatis.dynamic.sql.util.StringConstantMapping;
import org.mybatis.dynamic.sql.util.ValueMapping;
import org.mybatis.dynamic.sql.util.ValueOrNullMapping;
import org.mybatis.dynamic.sql.util.ValueWhenPresentMapping;
import org.mybatis.dynamic.sql.where.AbstractWhereDSL;
import org.mybatis.dynamic.sql.where.AbstractWhereSupport;
import org.mybatis.dynamic.sql.where.WhereModel;

public class UpdateDSL extends AbstractWhereSupport.UpdateWhereBuilder> implements Buildable {

    private final Function adapterFunction;
    private final List columnMappings = new ArrayList<>();
    private final SqlTable table;
    private final UpdateWhereBuilder whereBuilder = new UpdateWhereBuilder();

    private UpdateDSL(SqlTable table, Function adapterFunction) {
        this.table = Objects.requireNonNull(table);
        this.adapterFunction = Objects.requireNonNull(adapterFunction);
    }

    public  SetClauseFinisher set(SqlColumn column) {
        return new SetClauseFinisher<>(column);
    }

    @Override
    public UpdateWhereBuilder where() {
        return whereBuilder;
    }

    /**
     * WARNING! Calling this method could result in an update statement that updates
     * all rows in a table.
     *
     * @return the update model
     */
    @NotNull
    @Override
    public R build() {
        UpdateModel updateModel = UpdateModel.withTable(table)
                .withColumnMappings(columnMappings)
                .withWhereModel(whereBuilder.buildWhereModel())
                .build();
        return adapterFunction.apply(updateModel);
    }

    public static  UpdateDSL update(Function adapterFunction, SqlTable table) {
        return new UpdateDSL<>(table, adapterFunction);
    }

    public static UpdateDSL update(SqlTable table) {
        return update(Function.identity(), table);
    }

    public class SetClauseFinisher {

        private final SqlColumn column;

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

        public UpdateDSL equalToNull() {
            columnMappings.add(NullMapping.of(column));
            return UpdateDSL.this;
        }

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

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

        public UpdateDSL equalTo(T value) {
            return equalTo(() -> value);
        }

        public UpdateDSL equalTo(Supplier valueSupplier) {
            columnMappings.add(ValueMapping.of(column, valueSupplier));
            return UpdateDSL.this;
        }

        public UpdateDSL equalTo(Buildable buildable) {
            columnMappings.add(SelectMapping.of(column, buildable));
            return UpdateDSL.this;
        }

        public UpdateDSL equalTo(BasicColumn rightColumn) {
            columnMappings.add(ColumnToColumnMapping.of(column, rightColumn));
            return UpdateDSL.this;
        }

        public UpdateDSL equalToOrNull(T value) {
            return equalToOrNull(() -> value);
        }

        public UpdateDSL equalToOrNull(Supplier valueSupplier) {
            columnMappings.add(ValueOrNullMapping.of(column, valueSupplier));
            return UpdateDSL.this;
        }

        public UpdateDSL equalToWhenPresent(T value) {
            return equalToWhenPresent(() -> value);
        }

        public UpdateDSL equalToWhenPresent(Supplier valueSupplier) {
            columnMappings.add(ValueWhenPresentMapping.of(column, valueSupplier));
            return UpdateDSL.this;
        }
    }

    public class UpdateWhereBuilder extends AbstractWhereDSL implements Buildable {

        private UpdateWhereBuilder() {}

        @NotNull
        @Override
        public R build() {
            return UpdateDSL.this.build();
        }

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

        protected WhereModel buildWhereModel() {
            return internalBuild();
        }
    }
}