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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.QueryMetadata;
import com.querydsl.core.QueryModifiers;
import com.querydsl.core.types.Ops;
import com.querydsl.sql.types.NumericBooleanType;
import java.sql.Types;

/**
 * {@code CUBRIDTemplates} is a SQL dialect for CUBRID
 *
 * @author tiwe
 */
public class CUBRIDTemplates extends SQLTemplates {

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

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

  private String limitTemplate = "\nlimit {0}";

  private String offsetLimitTemplate = "\nlimit {0}, {1}";

  public CUBRIDTemplates() {
    this('\\', false);
  }

  public CUBRIDTemplates(boolean quote) {
    this('\\', quote);
  }

  public CUBRIDTemplates(char escape, boolean quote) {
    super(Keywords.CUBRID, "\"", escape, quote, false);
    setDummyTable(null);
    addCustomType(NumericBooleanType.DEFAULT);
    setParameterMetadataAvailable(false);
    setNullsFirst(null);
    setNullsLast(null);
    setDefaultValues("\ndefault values");
    setArraysSupported(false);

    add(Ops.DateTimeOps.DATE, "trunc({0})");

    add(Ops.DateTimeOps.DAY_OF_YEAR, "dayofyear({0})");
    add(Ops.DateTimeOps.DAY_OF_WEEK, "dayofweek({0})");
    add(Ops.DateTimeOps.YEAR_WEEK, "(year({0}) * 100 + week({0}))");

    add(Ops.DateTimeOps.ADD_YEARS, "date_add({0}, interval {1s} year)");
    add(Ops.DateTimeOps.ADD_MONTHS, "date_add({0}, interval {1s} month)");
    add(Ops.DateTimeOps.ADD_WEEKS, "date_add({0}, interval {1s} week)");
    add(Ops.DateTimeOps.ADD_DAYS, "date_add({0}, interval {1s} day)");
    add(Ops.DateTimeOps.ADD_HOURS, "date_add({0}, interval {1s} hour)");
    add(Ops.DateTimeOps.ADD_MINUTES, "date_add({0}, interval {1s} minute)");
    add(Ops.DateTimeOps.ADD_SECONDS, "date_add({0}, interval {1s} second)");

    String diffSeconds = "(unix_timestamp({1}) - unix_timestamp({0}))";
    add(Ops.DateTimeOps.DIFF_YEARS, "(year({1}) - year({0}))");
    add(Ops.DateTimeOps.DIFF_MONTHS, "months_between({1}, {0})");
    add(Ops.DateTimeOps.DIFF_WEEKS, "ceil(({1}-{0}) / 7)");
    add(Ops.DateTimeOps.DIFF_DAYS, "({1}-{0})");
    add(Ops.DateTimeOps.DIFF_HOURS, "ceil(" + diffSeconds + " / 3600)");
    add(Ops.DateTimeOps.DIFF_MINUTES, "ceil(" + diffSeconds + " / 60)");
    add(Ops.DateTimeOps.DIFF_SECONDS, diffSeconds);

    add(Ops.DateTimeOps.TRUNC_YEAR, "trunc({0},'yyyy')");
    add(Ops.DateTimeOps.TRUNC_MONTH, "trunc({0},'mm')");
    add(Ops.DateTimeOps.TRUNC_WEEK, "trunc({0},'day')");
    add(Ops.DateTimeOps.TRUNC_DAY, "trunc({0},'dd')");
    // trunc works only with date arguments
    // timestamp(datepart, timepart) reconstructs a datetime
    add(Ops.DateTimeOps.TRUNC_HOUR, "timestamp(date({0}),concat(hour({0}),':00:00'))");
    add(
        Ops.DateTimeOps.TRUNC_MINUTE,
        "timestamp(date({0}),concat(hour({0}),':',minute({0}),':00'))");
    add(
        Ops.DateTimeOps.TRUNC_SECOND,
        "timestamp(date({0}),concat(hour({0}),':',minute({0}),':',second({0})))");

    add(Ops.MathOps.LN, "ln({0})");
    add(Ops.MathOps.LOG, "(ln({0}) / ln({1}))");
    add(Ops.MathOps.COSH, "(exp({0}) + exp({0*'-1'})) / 2");
    add(Ops.MathOps.COTH, "(exp({0*'2'}) + 1) / (exp({0*'2'}) - 1)");
    add(Ops.MathOps.SINH, "(exp({0}) - exp({0*'-1'})) / 2");
    add(Ops.MathOps.TANH, "(exp({0*'2'}) - 1) / (exp({0*'2'}) + 1)");

    add(SQLOps.GROUP_CONCAT2, "group_concat({0} separator '{1s}')");

    addTypeNameToCode("numeric(1,0)", Types.BOOLEAN, true);
    addTypeNameToCode("numeric(3,0)", Types.TINYINT, true);
    addTypeNameToCode("numeric(38,0)", Types.BIGINT, true);
    addTypeNameToCode("bit varying", Types.LONGVARBINARY);
    addTypeNameToCode("bit varying", Types.VARBINARY);
    addTypeNameToCode("bit", Types.BINARY, true);
    addTypeNameToCode("varchar", Types.LONGVARCHAR, true);
    addTypeNameToCode("double", Types.FLOAT, true);
    addTypeNameToCode("float", Types.REAL, true);
  }

  @Override
  public String serialize(String literal, int jdbcType) {
    switch (jdbcType) {
      case Types.TIMESTAMP:
        return "timestamp'" + literal + "'";
      case Types.DATE:
        return "date'" + literal + "'";
      case Types.TIME:
        return "time'" + literal + "'";
      default:
        return super.serialize(literal, jdbcType);
    }
  }

  @Override
  protected void serializeModifiers(QueryMetadata metadata, SQLSerializer context) {
    QueryModifiers mod = metadata.getModifiers();
    if (mod.getLimit() != null) {
      if (mod.getOffset() != null) {
        context.handle(offsetLimitTemplate, mod.getOffset(), mod.getLimit());
      } else {
        context.handle(limitTemplate, mod.getLimit());
      }
    } else if (mod.getOffset() != null) {
      context.handle(offsetLimitTemplate, mod.getOffset(), Integer.MAX_VALUE);
    }
  }
}