kenh.xscript.database.elements.Savepoint.java Source code

Introduction

Here is the source code for kenh.xscript.database.elements.Savepoint.java

Source

/*
 * xScript.database ( Database for XML Script Language)
 * Copyright 2015 and beyond, Kenneth Huang
 * 
 * This file is part of xScript.database.
 * 
 * xScript.database is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.
 * 
 * xScript.database 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with xScript.database.  If not, see <http://www.gnu.org/licenses/>. 
 */

package kenh.xscript.database.elements;

import kenh.expl.UnsupportedExpressionException;
import kenh.xscript.annotation.Attribute;
import kenh.xscript.annotation.Processing;
import kenh.xscript.annotation.Text;
import kenh.xscript.impl.*;
import kenh.xscript.*;

import java.util.*;

import javax.sql.DataSource;

import org.apache.commons.lang3.StringUtils;

/**
 * Savepoint element. Creates an savepoint in the current transaction of database connection.
 * 
 * @author Kenneth
 * @version 1.0
 *
 */
public class Savepoint extends NoChildElement {

    private static final String ATTRIBUTE_VARIABLE = "var"; // variable name
    private static final String ATTRIBUTE_REF = "ref"; // reference name of database connection

    public void process(@Attribute(ATTRIBUTE_VARIABLE) String var,
            @Attribute(ATTRIBUTE_REF) java.sql.Connection conn) throws UnsupportedScriptException {
        var = StringUtils.trimToEmpty(var);

        if (StringUtils.isBlank(var)) {
            UnsupportedScriptException ex = new UnsupportedScriptException(this, "Variable name is empty.");
            throw ex;
        }

        java.sql.Savepoint sp = null;
        try {
            sp = conn.setSavepoint();
        } catch (Exception e) {
            throw new UnsupportedScriptException(this, e);
        }

        this.saveVariable(var, sp, null);
    }

    public void process(@Attribute(ATTRIBUTE_VARIABLE) String var, @Attribute(ATTRIBUTE_REF) String ref)
            throws UnsupportedScriptException {
        if (this.getEnvironment().containsVariable(ref)) {
            Object obj = this.getEnvironment().getVariable(ref);
            if (obj instanceof java.sql.Connection) {
                process(var, (java.sql.Connection) obj);
            } else {
                throw new UnsupportedScriptException(this,
                        "Can't convert to Connection. [" + ref + ", " + obj.getClass().getCanonicalName() + "]");
            }
        } else {
            throw new UnsupportedScriptException(this, "Can't find connection to save point.");
        }
    }
}