com.ephesoft.dcma.da.common.EphesoftSQLServerDialect.java Source code

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Here is the source code for com.ephesoft.dcma.da.common.EphesoftSQLServerDialect.java

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/********************************************************************************* 
* Ephesoft is a Intelligent Document Capture and Mailroom Automation program 
* developed by Ephesoft, Inc. Copyright (C) 2010-2012 Ephesoft Inc. 
* 
* This program is free software; you can redistribute it and/or modify it under 
* the terms of the GNU Affero General Public License version 3 as published by the 
* Free Software Foundation with the addition of the following permission added 
* to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK 
* IN WHICH THE COPYRIGHT IS OWNED BY EPHESOFT, EPHESOFT DISCLAIMS THE WARRANTY 
* OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 
* 
* This program is distributed in the hope that it will be useful, but WITHOUT 
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
* FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
* details. 
* 
* You should have received a copy of the GNU Affero General Public License along with 
* this program; if not, see http://www.gnu.org/licenses or write to the Free 
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
* 02110-1301 USA. 
* 
* You can contact Ephesoft, Inc. headquarters at 111 Academy Way, 
* Irvine, CA 92617, USA. or at email address info@ephesoft.com. 
* 
* The interactive user interfaces in modified source and object code versions 
* of this program must display Appropriate Legal Notices, as required under 
* Section 5 of the GNU Affero General Public License version 3. 
* 
* In accordance with Section 7(b) of the GNU Affero General Public License version 3, 
* these Appropriate Legal Notices must retain the display of the "Ephesoft" logo. 
* If the display of the logo is not reasonably feasible for 
* technical reasons, the Appropriate Legal Notices must display the words 
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********************************************************************************/

package com.ephesoft.dcma.da.common;

import java.util.Iterator;
import java.util.Map;

import org.hibernate.LockMode;
import org.hibernate.dialect.SQLServerDialect;

import com.ephesoft.dcma.da.constant.DataAccessConstant;

/**
 * This class applies lock to ephesoft SQL server dialect.
 * 
 * @author Ephesoft
 * @version 1.0
 * @see org.hibernate.dialect.SQLServerDialect
 */
public class EphesoftSQLServerDialect extends SQLServerDialect {

    /**
     * This method appends lock hint.
     * 
     * @param mode LockMode 
     * @param tableName {@link String}
     * @return {@link String}
     */
    public String appendLockHint(LockMode mode, String tableName) {
        if (mode.greaterThan(LockMode.READ)) {
            // does this need holdlock also? : return tableName + " with (updlock, rowlock, holdlock)";
            return tableName + " with (updlock, rowlock)";
        } else {
            return tableName + " with (READCOMMITTED)";
        }
    }

    /**
     * This method applies lock to sql.
     * 
     * @param sql {@link String}
     * @param aliasedLockModes {@link Map}
     * @param keyColumnNames {@link Map}
     * @return {@link String}
     */
    public String applyLocksToSql(String sql, Map aliasedLockModes, Map keyColumnNames) {
        Iterator itr = aliasedLockModes.entrySet().iterator();
        StringBuffer buffer = new StringBuffer(sql);
        int correction = 0;
        while (itr.hasNext()) {
            final Map.Entry entry = (Map.Entry) itr.next();
            final LockMode lockMode = (LockMode) entry.getValue();

            final String alias = (String) entry.getKey();
            int start = -1, end = -1;
            if (sql.endsWith(DataAccessConstant.SPACE + alias)) {
                start = (sql.length() - alias.length()) + correction;
                end = start + alias.length();
            } else {
                int position = sql.indexOf(DataAccessConstant.SPACE + alias + DataAccessConstant.SPACE);
                if (position <= -1) {
                    position = sql.indexOf(DataAccessConstant.SPACE + alias + DataAccessConstant.COMMA);
                }
                if (position > -1) {
                    start = position + correction + 1;
                    end = start + alias.length();
                }
            }

            if (start > -1) {
                final String lockHint = appendLockHint(lockMode, alias);
                buffer.replace(start, end, lockHint);
                correction += (lockHint.length() - alias.length());
            }

        }
        return buffer.toString();
    }

}