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SQL support for querydsl
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package com.mysema.query.sql;

import java.sql.Types;

import com.mysema.query.QueryMetadata;
import com.mysema.query.QueryModifiers;
import com.mysema.query.types.Ops;

public class FirebirdTemplates extends SQLTemplates {

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

    private String limitOffsetTemplate = "\nrows {0} to {1}";

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

    private String offsetTemplate = "\nrows {0} to " + Integer.MAX_VALUE;

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

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

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

    public FirebirdTemplates(char escape, boolean quote) {
        super("\"", escape, quote);
        setDummyTable("RDB$DATABASE");
        setUnionsWrapped(false);
        setWrapSelectParameters(true);
        setArraysSupported(false);

        // string
        add(Ops.CHAR_AT, "cast(substring({0} from {1s}+1 for 1) as char)");
        add(Ops.SUBSTR_1ARG, "substring({0} from {1s}+1)", 1);
        add(Ops.SUBSTR_2ARGS, "substring({0} from {1s}+1 for {2s}-{1s})", 1);
        add(Ops.INDEX_OF, "position({1},{0})-1");
        add(Ops.INDEX_OF_2ARGS, "position({1},{0},{2s}+1)-1");
        add(Ops.StringOps.LOCATE, "position({0},{1})");
        add(Ops.StringOps.LOCATE2, "position({0},{1},{2})");
        add(Ops.STRING_LENGTH, "char_length({0})");
        add(Ops.STRING_IS_EMPTY, "char_length({0}) = 0");

        add(Ops.AggOps.BOOLEAN_ANY, "any({0})");
        add(Ops.AggOps.BOOLEAN_ALL, "all({0})");

        // math
        add(Ops.MathOps.LOG, "log({1},{0})");
        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(Ops.MathOps.DEG, "({0} / pi() * 180.0)");
        add(Ops.MathOps.RAD, "(({0} / 180.0) * pi())");

        //
        add(Ops.DateTimeOps.DATE, "cast({0} as date)");

        add(Ops.DateTimeOps.MILLISECOND, "extract(millisecond from {0})");
        add(Ops.DateTimeOps.YEAR_MONTH, "(extract(year from {0}) * 100 + extract(month from {0}))");
        add(Ops.DateTimeOps.YEAR_WEEK, "(extract(year from {0}) * 100 + extract(week from {0}))");
        add(Ops.DateTimeOps.DAY_OF_WEEK, "extract(weekday from {0})");
        add(Ops.DateTimeOps.DAY_OF_MONTH, "extract(day from {0})");
        //add(Ops.DateTimeOps.DAY_OF_YEAR, "extract(day_of_year from {0})");

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

        add(Ops.DateTimeOps.DIFF_YEARS, "datediff(year,{0},{1})");
        add(Ops.DateTimeOps.DIFF_MONTHS, "datediff(month,{0},{1})");
        add(Ops.DateTimeOps.DIFF_WEEKS, "datediff(week,{0},{1})");
        add(Ops.DateTimeOps.DIFF_DAYS, "datediff(day,{0},{1})");
        add(Ops.DateTimeOps.DIFF_HOURS, "datediff(hour,{0},{1})");
        add(Ops.DateTimeOps.DIFF_MINUTES, "datediff(minute,{0},{1})");
        add(Ops.DateTimeOps.DIFF_SECONDS, "datediff(second,{0},{1})");

        addTypeNameToCode("smallint", Types.BOOLEAN, true);
        addTypeNameToCode("smallint", Types.BIT, true);
        addTypeNameToCode("smallint", Types.TINYINT, true);
        addTypeNameToCode("decimal", Types.DOUBLE, true);
        addTypeNameToCode("blob sub_type 0", Types.LONGVARBINARY);
        addTypeNameToCode("blob sub_type 1", Types.LONGVARCHAR);
        addTypeNameToCode("double precision", Types.DOUBLE);
        addTypeNameToCode("array", Types.OTHER);
        addTypeNameToCode("blob sub_type <0 ", Types.BLOB);
    }

    @Override
    public String getCastTypeNameForCode(int code) {
        if (code == Types.VARCHAR) {
            return "varchar(256)";
        } else {
            return super.getCastTypeNameForCode(code);
        }
    }

    @Override
    protected void serializeModifiers(QueryMetadata metadata, SQLSerializer context) {
        QueryModifiers mod = metadata.getModifiers();
        if (mod.isRestricting()) {
            if (mod.getLimit() != null) {
                if (mod.getOffset() != null) {
                    context.handle(limitOffsetTemplate, mod.getOffset() + 1, mod.getOffset() + mod.getLimit());
                } else {
                    context.handle(limitTemplate, mod.getLimit());
                }
            } else {
                context.handle(offsetTemplate, mod.getOffset() + 1);
            }
        }
    }
}