Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

*

* 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 General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

* MA  02110-1301, USA.

*

*/

/*

* AUTHORS (In addition to CIT):

* 2008 IVER T.I   {{Task}}

*/

/**

 *

 */

package org.gvsig.data.datastores.vectorial.file;

import java.io.File;

import org.gvsig.data.Resource;

import org.gvsig.data.exception.CloseException;

import org.gvsig.data.exception.DataException;

import org.gvsig.data.exception.InitializeException;

import org.gvsig.data.exception.OpenException;

import org.gvsig.data.exception.ResourceChangedException;

/**

 * @author jmvivo

 *

 */

public abstract class FileResource extends Resource implements IFileResource {

        protected File file;

        private long fileLastModified=0;

        private boolean opened;

        public FileResource(File aFile){

                this.file = aFile;

        }

        public void setFile(File aFile) throws InitializeException{

                if (this.getRefencesCount() > 0){

                        throw new InitializeException("Resource in use",this.description());

                }

                this.file=aFile;

        }

        public File getFile(){

                return this.file;

        }

        /* (non-Javadoc)

         * @see org.gvsig.data.Resource#isOpen()

         */

        public boolean isOpen() {

                return this.opened;

        }

        /* (non-Javadoc)

         * @see org.gvsig.data.Resource#doChanged()

         */

        protected void doChanged() {

                this.updateLastModified();

        }

        protected void updateLastModified(){

                this.fileLastModified = this.file.lastModified();

        }

        protected void checkChanged() throws ResourceChangedException{

                if (this.fileLastModified == 0){

                        return;

                }

                if (this.fileLastModified < this.file.lastModified()){

                        this.changed();

                        throw new ResourceChangedException(this.description());

                }

        }

        protected void setOpened(){

                this.opened=true;

        }

        /* (non-Javadoc)

         * @see org.gvsig.data.Resource#doDispose()

         */

        protected void doDispose() throws DataException{

                this.file = null;

        }

        /* (non-Javadoc)

         * @see org.gvsig.data.Resource#doClose()

         */

        protected boolean doClose() throws CloseException{

                this.opened= false;

                return true;

        }

        protected synchronized void checkOpen() throws OpenException{

                if (!this.isOpen()){

                        this.open();

                }

        }

}