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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.xerces.xni.grammars;

/**
 *  This interface specifies how the parser and the application
 * interact with respect to Grammar objects that the application
 * possesses--either by having precompiled them or by having stored them
 * from a previous validation of an instance document.  It makes no
 * assumptions about the kind of Grammar involved, or about how the
 * application's storage mechanism works.
 *
 * The interaction works as follows:
 * 

 * When a validator considers a document, it is expected to request
 * grammars of the type it can handle from this object using the
 * retrieveInitialGrammarSet method. 
 * If it requires a grammar
 * not in this set, it will request it from this Object using the
 * retrieveGrammar method.  
 *  After successfully validating an
 * instance, the validator should make any new grammars it has compiled
 * available to this object using the cacheGrammars
 * method; for ease of implementation it may make other Grammars it holds references to as well (i.e., 
 * it may return some grammars that were retrieved from the GrammarPool in earlier operations). 
 
 
 *
 * @author Neil Graham, IBM
 * @version $Id: XMLGrammarPool.java 447245 2006-09-18 05:22:10Z mrglavas $
 */

public interface XMLGrammarPool {

    // we are trying to make this XMLGrammarPool work for all kinds of
    // grammars, so we have a parameter "grammarType" for each of the
    // methods. 

    /**
     *  retrieve the initial known set of grammars. this method is
     * called by a validator before the validation starts. the application 
     * can provide an initial set of grammars available to the current 
     * validation attempt. 
     * @param grammarType the type of the grammar, from the
     *  org.apache.xerces.xni.grammars.Grammar interface.
     * @return the set of grammars the validator may put in its "bucket"
     */
    public Grammar[] retrieveInitialGrammarSet(String grammarType);

    /** 
     * return the final set of grammars that the validator ended up
     * with.  
     * This method is called after the
     * validation finishes. The application may then choose to cache some
     * of the returned grammars. 
     * @param grammarType the type of the grammars being returned;
     * @param grammars an array containing the set of grammars being
     *  returned; order is not significant.
     */
    public void cacheGrammars(String grammarType, Grammar[] grammars);

    /** 
     *  This method requests that the application retrieve a grammar
     * corresponding to the given GrammarIdentifier from its cache.
     * If it cannot do so it must return null; the parser will then
     * call the EntityResolver.  An application must not call its
     * EntityResolver itself from this method; this may result in infinite
     * recursions.
     * @param desc The description of the Grammar being requested.
     * @return the Grammar corresponding to this description or null if
     *  no such Grammar is known.
     */
    public Grammar retrieveGrammar(XMLGrammarDescription desc);

    /**
     * Causes the XMLGrammarPool not to store any grammars when
     * the cacheGrammars(String, Grammar[[]) method is called.
     */
    public void lockPool();

    /**
     * Allows the XMLGrammarPool to store grammars when its cacheGrammars(String, Grammar[])
     * method is called.  This is the default state of the object.
     */
    public void unlockPool();

    /**
     * Removes all grammars from the pool.
     */
    public void clear();
} // XMLGrammarPool