| 1 | /*
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| 2 | * ModuleInterface.java
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| 3 | * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation; either version 2 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program; if not, write to the Free Software
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| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 18 | */
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| 19 | package org.greenstone.gsdl3.core;
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| 20 |
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| 21 | import org.w3c.dom.Node;
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| 22 |
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| 23 | /**
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| 24 | * interface for all modules in greenstone.
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| 25 | *
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| 26 | * all components talk via a process method - in its simplest form,
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| 27 | * it takes a String of XML, and returns a String of XML
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| 28 | *
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| 29 | * the more efficient process method uses DOM Nodes instead
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| 30 | * of Strings - this avoids parsing the XML at each module
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| 31 | *
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| 32 | * @author Katherine Don
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| 33 | * @version $Revision: 25727 $
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| 34 | */
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| 35 | public interface ModuleInterface {
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| 36 |
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| 37 | /**
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| 38 | * Process an XML request - as a String
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| 39 | *
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| 40 | * @param xml_in the request to process
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| 41 | * @return the response - contains any error messages
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| 42 | * @see java.lang.String
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| 43 | */
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| 44 | abstract public String process(String xml_in);
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| 45 |
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| 46 | /**
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| 47 | * Process an XML request - as a DOM model Node
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| 48 | *
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| 49 | * @param xml_in the request to process
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| 50 | * @return the response - contains any error messages
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| 51 | * @see org.w3c.dom.Node
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| 52 | */
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| 53 | abstract public Node process(Node xml_in);
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| 54 |
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| 55 | /**
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| 56 | * Do any clean up necessary for deactivating the module, eg
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| 57 | * close any open file handles (gdbm in particular) or windows
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| 58 | * holds locks on them.
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| 59 | */
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| 60 | abstract public void cleanUp();
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| 61 | }
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| 62 |
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