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* The Apache Software License, Version 1.1
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* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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* 4. The names "Xerces" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache",
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* permission of the Apache Software Foundation.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation and was
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* originally based on software copyright (c) 1999, International
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* Business Machines, Inc., http://www.apache.org. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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package org.apache.xerces.xni.grammars;
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* <p> This interface specifies how the parser and the application
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* interact with respect to Grammar objects that the application
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* possesses--either by having precompiled them or by having stored them
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* from a previous validation of an instance document. It makes no
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* assumptions about the kind of Grammar involved, or about how the
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* application's storage mechanism works.</p>
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* <p>The interaction works as follows:
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* <li>When a validator considers a document, it is expected to request
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* grammars of the type it can handle from this object using the
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* <code>retrieveInitialGrammarSet</code> method. </li>
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* <li>If it requires a grammar
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* not in this set, it will request it from this Object using the
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* <code>retrieveGrammar</code> method. </li>
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* <li> After successfully validating an
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* instance, the validator should make any new grammars it has compiled
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* available to this object using the <code>cacheGrammars</code>
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* method; for ease of implementation it may make other Grammars it holds references to as well (i.e.,
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* it may return some grammars that were retrieved from the GrammarPool in earlier operations). </li> </ul> </p>
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* @author Neil Graham, IBM
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* @version $Id: XMLGrammarPool.java,v 1.3 2003/11/14 16:54:05 mrglavas Exp $
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public interface XMLGrammarPool {
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// <p>we are trying to make this XMLGrammarPool work for all kinds of
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// grammars, so we have a parameter "grammarType" for each of the
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* <p> retrieve the initial known set of grammars. this method is
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* called by a validator before the validation starts. the application
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* can provide an initial set of grammars available to the current
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* validation attempt. </p>
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* @param grammarType the type of the grammar, from the
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* <code>org.apache.xerces.xni.grammars.Grammar</code> interface.
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* @return the set of grammars the validator may put in its "bucket"
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public Grammar[] retrieveInitialGrammarSet(String grammarType);
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* <p>return the final set of grammars that the validator ended up
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* This method is called after the
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* validation finishes. The application may then choose to cache some
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* of the returned grammars. </p>
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* @param grammarType the type of the grammars being returned;
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* @param grammars an array containing the set of grammars being
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* returned; order is not significant.
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public void cacheGrammars(String grammarType, Grammar[] grammars);
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* <p> This method requests that the application retrieve a grammar
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* corresponding to the given GrammarIdentifier from its cache.
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* If it cannot do so it must return null; the parser will then
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* call the EntityResolver. <strong>An application must not call its
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* EntityResolver itself from this method; this may result in infinite
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* recursions.</strong>
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* @param desc The description of the Grammar being requested.
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* @return the Grammar corresponding to this description or null if
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* no such Grammar is known.
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public Grammar retrieveGrammar(XMLGrammarDescription desc);
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* Causes the XMLGrammarPool not to store any grammars when
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* the cacheGrammars(String, Grammar[[]) method is called.
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public void lockPool();
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* Allows the XMLGrammarPool to store grammars when its cacheGrammars(String, Grammar[])
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* method is called. This is the default state of the object.
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public void unlockPool();
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* Removes all grammars from the pool.
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src/org/apache/xerces/xni/grammars/XMLGrammarPool.java
