replacejarconstantaction.java

derby database source code.good for you.

/*

   Derby - Class org.apache.derby.impl.sql.execute.ReplaceJarConstantAction

   Copyright 1998, 2004 The Apache Software Foundation or its licensors, as applicable.

   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 org.apache.derby.impl.sql.execute;

import org.apache.derby.iapi.services.sanity.SanityManager;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.sql.execute.ConstantAction;

import org.apache.derby.iapi.sql.Activation;

import org.apache.derby.catalog.UUID;
/**
 *	Constant action to Add an external  Jar file to a database. 
 *
 */
class ReplaceJarConstantAction extends DDLConstantAction
{

	private final UUID id;
	private final String schemaName;
	private final String sqlName;
	private final String externalPath;
	//////////////////////////////////////////////////////////////
	//
	// CONSTRUCTORS
	//
	//////////////////////////////////////////////////////////////

	/**
	 *	Make the ConstantAction to replace a jar file in a database.
	 *
	 *	@param	id					The id for the jar file
	 *	@param	schemaName			The SchemaName for the jar file.
	 *	@param	sqlName			    The sqlName for the jar file.
	 *  @param  fileName            The name of the file that holds the jar.
	 */
	ReplaceJarConstantAction(UUID id,
									String schemaName,
									String sqlName,
									String externalPath)
	{
		this.id = id;
		this.schemaName = schemaName;
		this.sqlName = sqlName;
		this.externalPath = externalPath;
	}

	//////////////////////////////////////////////////////////////
	//
	// OBJECT SHADOWS
	//
	//////////////////////////////////////////////////////////////

	public	String	toString()
	{
		// Do not put this under SanityManager.DEBUG - it is needed for
		// error reporting.
		return "REPLACE JAR FILE " + schemaName + "." + sqlName;
	}

	//////////////////////////////////////////////////////////////
	//
	// CONSTANT ACTION METHODS
	//
	//////////////////////////////////////////////////////////////
	/**
	 * @see ConstantAction#executeConstantAction
	 * @exception StandardException Thrown on failure
	 */
	public void	executeConstantAction( Activation activation )
						throws StandardException
	{
		JarUtil.replace(id,schemaName,
									   sqlName,
									   externalPath,
									   purgeOnCommit());
	}

	//
	// Replication can over-ride this to defer purging dropped jar
	// files that remain in the stage.
	protected boolean purgeOnCommit() { return true; }

}