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SQL support for Querydsl
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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.sql;

import com.querydsl.core.QueryFlag;
import com.querydsl.core.QueryFlag.Position;
import com.querydsl.core.QueryMetadata;
import com.querydsl.core.QueryModifiers;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.dsl.Expressions;
import java.util.Map;
import java.util.Set;

/**
 * {@code SQLServer2012Templates} is an SQL dialect for Microsoft SQL Server 2012 and later
 *
 * @author tiwe
 */
public class SQLServer2012Templates extends SQLServerTemplates {

  @SuppressWarnings("FieldNameHidesFieldInSuperclass") // Intentional
  public static final SQLServer2012Templates DEFAULT = new SQLServer2012Templates();

  private String topTemplate = "top {0s} ";

  private String limitOffsetTemplate = "\noffset {1} rows fetch next {0} rows only";

  private String offsetTemplate = "\noffset {0} rows";

  public static Builder builder() {
    return new Builder() {
      @Override
      protected SQLTemplates build(char escape, boolean quote) {
        return new SQLServer2012Templates(escape, quote);
      }
    };
  }

  public SQLServer2012Templates() {
    this(Keywords.SQLSERVER2012, '\\', false);
  }

  public SQLServer2012Templates(boolean quote) {
    this(Keywords.SQLSERVER2012, '\\', quote);
  }

  public SQLServer2012Templates(char escape, boolean quote) {
    this(Keywords.SQLSERVER2012, escape, quote);
  }

  protected SQLServer2012Templates(Set keywords, char escape, boolean quote) {
    super(keywords, escape, quote);
    add(SQLOps.NEXTVAL, "next value for {0s}");
  }

  @Override
  public void serialize(QueryMetadata metadata, boolean forCountRow, SQLSerializer context) {
    if (!forCountRow
        && metadata.getModifiers().isRestricting()
        && metadata.getOrderBy().isEmpty()
        && !metadata.getJoins().isEmpty()) {
      metadata = metadata.clone();
      QueryModifiers mod = metadata.getModifiers();
      // use top if order by is empty
      if (mod.getOffset() == null) {
        // select top ...
        metadata.addFlag(
            new QueryFlag(
                QueryFlag.Position.AFTER_SELECT,
                Expressions.template(Integer.class, topTemplate, mod.getLimit())));
      } else {
        // order by first column
        metadata.addOrderBy(Expressions.ONE.asc());
      }
    }
    context.serializeForQuery(metadata, forCountRow);

    if (!metadata.getFlags().isEmpty()) {
      context.serialize(Position.END, metadata.getFlags());
    }
  }

  @Override
  public void serializeDelete(
      QueryMetadata metadata, RelationalPath entity, SQLSerializer context) {
    // limit
    QueryModifiers mod = metadata.getModifiers();
    if (mod.isRestricting()) {
      metadata = metadata.clone();
      metadata.addFlag(
          new QueryFlag(
              QueryFlag.Position.AFTER_SELECT,
              Expressions.template(Integer.class, topTemplate, mod.getLimit())));
    }

    context.serializeForDelete(metadata, entity);

    if (!metadata.getFlags().isEmpty()) {
      context.serialize(Position.END, metadata.getFlags());
    }
  }

  @Override
  public void serializeUpdate(
      QueryMetadata metadata,
      RelationalPath entity,
      Map, Expression> updates,
      SQLSerializer context) {
    // limit
    QueryModifiers mod = metadata.getModifiers();
    if (mod.isRestricting()) {
      metadata = metadata.clone();
      metadata.addFlag(
          new QueryFlag(
              QueryFlag.Position.AFTER_SELECT,
              Expressions.template(Integer.class, topTemplate, mod.getLimit())));
    }

    context.serializeForUpdate(metadata, entity, updates);

    if (!metadata.getFlags().isEmpty()) {
      context.serialize(Position.END, metadata.getFlags());
    }
  }

  @Override
  protected void serializeModifiers(QueryMetadata metadata, SQLSerializer context) {
    if (!metadata.getOrderBy().isEmpty()) {
      QueryModifiers mod = metadata.getModifiers();
      if (mod.getLimit() == null) {
        context.handle(offsetTemplate, mod.getOffset());
      } else if (mod.getOffset() == null) {
        context.handle(limitOffsetTemplate, mod.getLimit(), 0);
      } else {
        context.handle(limitOffsetTemplate, mod.getLimit(), mod.getOffset());
      }
    }
  }
}