pipedmarshaller.java

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//
// This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code and modified
// code that was published under the GNU General Public License. Copyrights for modified 
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
//
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//       
// For more information contact: 
//      OpenNMS Licensing       <[e-mail]>
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//      http://www.opennms.com/
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package org.opennms.netmgt.rtc.utils;

import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;
import java.io.Reader;
import java.lang.reflect.UndeclaredThrowableException;

import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.Marshaller;
import org.exolab.castor.xml.ValidationException;
import org.opennms.core.utils.ThreadCategory;
import org.opennms.netmgt.xml.rtc.EuiLevel;

/**
 * The class that marshalls the object to be sent to a PipedReader
 * 
 * @author <A HREF="mailto:[e-mail]">Brian Weaver </A>
 * @author <A HREF="http://www.opennms.org">OpenNMS.org </A>
 */
public class PipedMarshaller {
    private EuiLevel m_objToMarshall;

    private class MarshalThread implements Runnable {
        private PipedWriter m_out;

        private PipedReader m_in;

        private EuiLevel m_obj;

        MarshalThread(EuiLevel inp) throws IOException {
            m_obj = inp;
            m_out = new PipedWriter();
            m_in = new PipedReader(m_out);
        }

        public void run() {
            try {
                Marshaller.marshal(m_obj, m_out);
                m_out.flush();
                m_out.close();
            } catch (MarshalException e) {
                ThreadCategory.getInstance(this.getClass()).error("Failed to convert category to xml", e);
                throw new UndeclaredThrowableException(e);
            } catch (ValidationException e) {
                ThreadCategory.getInstance(this.getClass()).error("Failed to convert category to xml", e);
                throw new UndeclaredThrowableException(e);
            } catch (IOException e) {
                ThreadCategory.getInstance(this.getClass()).error("Failed to convert category to xml", e);
                throw new UndeclaredThrowableException(e);
            }
        }

        Reader getReader() {
            return m_in;
        }
    }

    public PipedMarshaller(EuiLevel toMarshall) {
        m_objToMarshall = toMarshall;
    }

    public Reader getReader() throws IOException {
        Reader inr = null;
        try {
            MarshalThread m = new MarshalThread(m_objToMarshall);
            Thread t = new Thread(m, "PipedMarshaller");
            t.start();

            return m.getReader();
        } catch (IOException e) {
            throw e;
        }
    }
}