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/**
 * Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 * 
 * Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 * 
 * 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.tinygroup.tinysqldsl.select;

/**
 * A limit clause in the form [LIMIT {[offset,] row_count) | (row_count | ALL)
 * OFFSET offset}]
 */
public class Limit {

    private long offset;
    private long rowCount;
    private boolean rowCountJdbcParameter = false;
    private boolean offsetJdbcParameter = false;
    private boolean limitAll;
    private boolean limitNull = false;


    public Limit() {
        super();
    }

    public Limit(long offset, long rowCount) {
        super();
        this.offset = offset;
        this.rowCount = rowCount;
    }

    public Limit(long offset, long rowCount, boolean rowCountJdbcParameter,
                 boolean offsetJdbcParameter) {
        this(offset, rowCount);
        this.rowCountJdbcParameter = rowCountJdbcParameter;
        this.offsetJdbcParameter = offsetJdbcParameter;
    }

    public static Limit limitWithParam() {
        Limit limit = new Limit();
        limit.rowCountJdbcParameter = true;
        limit.offsetJdbcParameter = true;
        return limit;
    }


    public long getOffset() {
        return offset;
    }

    public void setOffset(long l) {
        offset = l;
    }

    public long getRowCount() {
        return rowCount;
    }

    public void setRowCount(long l) {
        rowCount = l;
    }

    public boolean isOffsetJdbcParameter() {
        return offsetJdbcParameter;
    }

    public void setOffsetJdbcParameter(boolean b) {
        offsetJdbcParameter = b;
    }

    public boolean isRowCountJdbcParameter() {
        return rowCountJdbcParameter;
    }

    public void setRowCountJdbcParameter(boolean b) {
        rowCountJdbcParameter = b;
    }

    /**
     * @return true if the limit is "LIMIT ALL [OFFSET ...])
     */
    public boolean isLimitAll() {
        return limitAll;
    }

    public void setLimitAll(boolean b) {
        limitAll = b;
    }

    /**
     * @return true if the limit is "LIMIT NULL [OFFSET ...])
     */
    public boolean isLimitNull() {
        return limitNull;
    }

    public void setLimitNull(boolean b) {
        limitNull = b;
    }

    @Override
    public String toString() {
        String retVal = "";
        if (limitNull) {
            retVal += " LIMIT NULL";
        } else if (rowCount >= 0 || rowCountJdbcParameter) {
            retVal += " LIMIT " + (rowCountJdbcParameter ? "?" : rowCount + "");
        }
        if (offset > 0 || offsetJdbcParameter) {
            retVal += " OFFSET " + (offsetJdbcParameter ? "?" : offset + "");
        }
        return retVal;
    }
}