org.pepstock.jem.jbpm.tasks.utilities.Copy.java Source code

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Here is the source code for org.pepstock.jem.jbpm.tasks.utilities.Copy.java

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/**
JEM, the BEE - Job Entry Manager, the Batch Execution Environment
Copyright (C) 2012-2015   Andrea "Stock" Stocchero
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 3 of the License, or
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, see <http://www.gnu.org/licenses/>.
*/
package org.pepstock.jem.jbpm.tasks.utilities;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;

import javax.naming.InitialContext;

import org.apache.commons.io.IOUtils;
import org.pepstock.jem.Result;
import org.pepstock.jem.jbpm.JBpmMessage;
import org.pepstock.jem.jbpm.tasks.JemWorkItem;
import org.pepstock.jem.log.LogAppl;
import org.pepstock.jem.log.MessageException;
import org.pepstock.jem.node.tasks.jndi.ContextUtils;

/**
 * JEM work item that copies a file or list of files 
 * (data description named INPUT) on other one (data description named OUTPUT).
 * 
 * @author Andrea "Stock" Stocchero
 * @version 2.2
 */
public class Copy implements JemWorkItem {

    /**
     * Data description name for files in INPUT
     */
    private static final String INPUT_DATA_DESCRIPTION_NAME = "INPUT";

    /**
     * Data description name for files in OUTPUT
     */
    private static final String OUTPUT_DATA_DESCRIPTION_NAME = "OUTPUT";

    /* (non-Javadoc)
     * @see org.pepstock.jem.jbpm.JemWorkItem#execute(java.util.Map)
     */
    @Override
    public int execute(Map<String, Object> parameters) throws Exception {
        // new initial context to access by JNDI to COMMAND DataDescription
        InitialContext ic = ContextUtils.getContext();
        // gets inputstream
        Object input = (Object) ic.lookup(INPUT_DATA_DESCRIPTION_NAME);
        // gets outputstream
        Object output = (Object) ic.lookup(OUTPUT_DATA_DESCRIPTION_NAME);
        // defines the streams
        InputStream istream = null;
        OutputStream ostream = null;
        // checks if object is a inputstream otherwise error
        if (input instanceof InputStream) {
            istream = (InputStream) input;
        } else {
            throw new MessageException(JBpmMessage.JEMM017E, INPUT_DATA_DESCRIPTION_NAME,
                    input.getClass().getName());
        }
        // checks if object is a outputstream otherwise error
        if (output instanceof OutputStream) {
            ostream = (OutputStream) output;
        } else {
            IOUtils.closeQuietly(istream);
            throw new MessageException(JBpmMessage.JEMM016E, OUTPUT_DATA_DESCRIPTION_NAME,
                    output.getClass().getName());
        }
        // copy
        int bytes = IOUtils.copy(istream, ostream);
        IOUtils.closeQuietly(istream);
        IOUtils.closeQuietly(ostream);
        LogAppl.getInstance().emit(JBpmMessage.JEMM062I, bytes);
        // returns OK!!!
        return Result.SUCCESS;
    }
}