xmlgrammarpoolimpl.java

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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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package com.sun.org.apache.xerces.internal.util;

import com.sun.org.apache.xerces.internal.xni.grammars.Grammar;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;

/**
 * Stores grammars in a pool associated to a specific key. This grammar pool
 * implementation stores two types of grammars: those keyed by the root element
 * name, and those keyed by the grammar's target namespace.
 *
 * This is the default implementation of the GrammarPool interface.
 * As we move forward, this will become more function-rich and robust.
 *
 * @author Jeffrey Rodriguez, IBM
 * @author Andy Clark, IBM
 * @author Neil Graham, IBM
 * @author Pavani Mukthipudi, Sun Microsystems
 * @author Neeraj Bajaj, SUN Microsystems
 *
 * @version $Id: XMLGrammarPoolImpl.java,v 1.6 2003/07/30 21:30:04 elena Exp $
 */
public class XMLGrammarPoolImpl implements XMLGrammarPool {

    //
    // Constants
    //

    /** Default size. */
    protected static final int TABLE_SIZE = 11;

    //
    // Data
    //

    /** Grammars. */
    protected Entry[] fGrammars = null;

    // whether this pool is locked
    protected boolean fPoolIsLocked;

    // the number of grammars in the pool
    protected int fGrammarCount = 0;

    private static final boolean DEBUG = false ;

    //
    // Constructors
    //

    /** Constructs a grammar pool with a default number of buckets. */
    public XMLGrammarPoolImpl() {
        fGrammars = new Entry[TABLE_SIZE];
        fPoolIsLocked = false;
    } // <init>()

    /** Constructs a grammar pool with a specified number of buckets. */
    public XMLGrammarPoolImpl(int initialCapacity) {
        fGrammars = new Entry[initialCapacity];
        fPoolIsLocked = false;
    }

    //
    // XMLGrammarPool methods
    //

    /* <p> 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. </p>
     *
     * @param grammarType The type of the grammar, from the
     *  		  <code>com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription</code>
     *  		  interface.
     * @return 		  The set of grammars the validator may put in its "bucket"
     */
    public Grammar [] retrieveInitialGrammarSet (String grammarType) {
        synchronized (fGrammars) {
            int grammarSize = fGrammars.length ;
            Grammar [] tempGrammars = new Grammar[fGrammarCount];
            int pos = 0;
            for (int i = 0; i < grammarSize; i++) {
                for (Entry e = fGrammars[i]; e != null; e = e.next) {
                    if (e.desc.getGrammarType().equals(grammarType)) {
                        tempGrammars[pos++] = e.grammar;
                    }
                }
            }
            Grammar[] toReturn = new Grammar[pos];
            System.arraycopy(tempGrammars, 0, toReturn, 0, pos);
            return toReturn;
        }
    } // retrieveInitialGrammarSet (String): Grammar[]

    /* <p> 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.</p>
     * <p>In this implementation, we make our choice based on whether this object
     * is "locked"--that is, whether the application has instructed
     * us not to accept any new grammars.</p>
     *
     * @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) {
        if(!fPoolIsLocked) {
            for (int i = 0; i < grammars.length; i++) {
                if(DEBUG) {
                    System.out.println("CACHED GRAMMAR " + (i+1) ) ;
                    Grammar temp = grammars[i] ;
                    //print(temp.getGrammarDescription());
                }
                putGrammar(grammars[i]);
            }
        }
    } // cacheGrammars(String, Grammar[]);

    /* <p> 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. </p>
     * <strong>An application must not call its EntityResolver itself
     * from this method; this may result in infinite recursions.</strong>
     *
     * This implementation chooses to use the root element name to identify a DTD grammar
     * and the target namespace to identify a Schema grammar.
     *
     * @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) {
        if(DEBUG){
            System.out.println("RETRIEVING GRAMMAR FROM THE APPLICATION WITH FOLLOWING DESCRIPTION :");
            //print(desc);
        }
        return getGrammar(desc);
    } // retrieveGrammar(XMLGrammarDescription):  Grammar

    //
    // Public methods
    //

    /**
     * Puts the specified grammar into the grammar pool and associates it to