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SQL support for querydsl
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/*
 * Copyright 2011, Mysema Ltd
 *
 * 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.mysema.query.sql;

import org.joda.time.ReadableInstant;

import com.mysema.query.types.Ops;

/**
 * SQLiteTemplates is a SQL dialect for SQLite
 *
 * @author tiwe
 *
 */
public class SQLiteTemplates extends SQLTemplates {

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

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

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

    public SQLiteTemplates(char escape, boolean quote) {
        super("\"", escape, quote);
        setDummyTable(null);
        setBigDecimalSupported(false);
        setUnionsWrapped(false);
        setLimitRequired(true);
        setNullsFirst(null);
        setNullsLast(null);
        add(Ops.MOD, "{0} % {1}");

        add(Ops.INDEX_OF, "charindex({1},{0},1)-1");
        add(Ops.INDEX_OF_2ARGS, "charindex({1},{0},{2s}+1)-1");

        add(Ops.StringOps.LOCATE, "charindex({0},{1})");
        add(Ops.StringOps.LOCATE2, "charindex({0},{1},{2s})");

        // TODO : optimize
        add(Ops.DateTimeOps.YEAR, "cast(strftime('%Y',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.MONTH, "cast(strftime('%m',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.WEEK, "cast(strftime('%W',{0} / 1000, 'unixepoch', 'localtime') as integer) + 1");
        add(Ops.DateTimeOps.DAY_OF_MONTH, "cast(strftime('%d',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.DAY_OF_WEEK, "cast(strftime('%w',{0} / 1000, 'unixepoch', 'localtime') as integer) + 1");
        add(Ops.DateTimeOps.DAY_OF_YEAR, "cast(strftime('%j',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.HOUR, "cast(strftime('%H',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.MINUTE, "cast(strftime('%M',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.SECOND, "cast(strftime('%S',{0} / 1000, 'unixepoch', 'localtime') as integer)");

        add(Ops.DateTimeOps.YEAR_MONTH, "cast(strftime('%Y',{0} / 1000, 'unixepoch', 'localtime') * 100 + strftime('%m',{0} / 1000, 'unixepoch', 'localtime') as integer)");
        add(Ops.DateTimeOps.YEAR_WEEK, "cast(strftime('%Y%W',{0} / 1000, 'unixepoch', 'localtime') as integer)");

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

        add(Ops.MathOps.RANDOM, "random()");
        add(Ops.MathOps.RANDOM2, "random({0})");
        add(Ops.MathOps.LN, "log({0})");
        add(Ops.MathOps.LOG, "(log({0}) / log({1}))");
    }

    @Override
    public String asLiteral(Object o) {
        if (o instanceof java.util.Date) {
            return String.valueOf(((java.util.Date)o).getTime());
        } else if (o instanceof ReadableInstant) {
            return String.valueOf(((ReadableInstant)o).getMillis());
        // TODO ReadablePartial
        } else {
            return super.asLiteral(o);
        }
    }

}