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For more * information on the Apache Software Foundation, please see * . */ package org.apache.xerces.impl.xs; import java.util.Hashtable; import java.util.Enumeration; import java.util.Vector; /** * A class used to hold the internal schema grammar set for the current instance * @author Sandy Gao, IBM * @version $Id: XSGrammarBucket.java,v 1.8 2003/09/23 21:42:31 mrglavas Exp $ */ public class XSGrammarBucket { // Data /** * Hashtable that maps between Namespace and a Grammar */ Hashtable fGrammarRegistry = new Hashtable(); SchemaGrammar fNoNSGrammar = null; /** * Get the schema grammar for the specified namespace * * @param namespace * @return SchemaGrammar associated with the namespace */ public SchemaGrammar getGrammar(String namespace) { if (namespace == null) return fNoNSGrammar; return (SchemaGrammar)fGrammarRegistry.get(namespace); } /** * Put a schema grammar into the registry * This method is for internal use only: it assumes that a grammar with * the same target namespace is not already in the bucket. * * @param grammar the grammar to put in the registry */ public void putGrammar(SchemaGrammar grammar) { if (grammar.getTargetNamespace() == null) fNoNSGrammar = grammar; else fGrammarRegistry.put(grammar.getTargetNamespace(), grammar); } /** * put a schema grammar and any grammars imported by it (directly or * inderectly) into the registry. when a grammar with the same target * namespace is already in the bucket, and different from the one being * added, it's an error, and no grammar will be added into the bucket. * * @param grammar the grammar to put in the registry * @param deep whether to add imported grammars * @return whether the process succeeded */ public boolean putGrammar(SchemaGrammar grammar, boolean deep) { // whether there is one with the same tns SchemaGrammar sg = getGrammar(grammar.fTargetNamespace); if (sg != null) { // if the one we have is different from the one passed, it's an error return sg == grammar; } // not deep import, then just add this one grammar if (!deep) { putGrammar(grammar); return true; } // get all imported grammars, and make a copy of the Vector, so that // we can recursively process the grammars, and add distinct ones // to the same vector Vector currGrammars = (Vector)grammar.getImportedGrammars(); if (currGrammars == null) { putGrammar(grammar); return true; } Vector grammars = ((Vector)currGrammars.clone()); SchemaGrammar sg1, sg2; Vector gs; // for all (recursively) imported grammars for (int i = 0; i < grammars.size(); i++) { // get the grammar sg1 = (SchemaGrammar)grammars.elementAt(i); // check whether the bucket has one with the same tns sg2 = getGrammar(sg1.fTargetNamespace); if (sg2 == null) { // we need to add grammars imported by sg1 too gs = sg1.getImportedGrammars(); // for all grammars imported by sg2, but not in the vector // we add them to the vector if(gs == null) continue; for (int j = gs.size() - 1; j >= 0; j--) { sg2 = (SchemaGrammar)gs.elementAt(j); if (!grammars.contains(sg2)) grammars.addElement(sg2); } } // we found one with the same target namespace // if the two grammars are not the same object, then it's an error else if (sg2 != sg1) { return false; } } // now we have all imported grammars stored in the vector. add them putGrammar(grammar); for (int i = grammars.size() - 1; i >= 0; i--) putGrammar((SchemaGrammar)grammars.elementAt(i)); return true; } /** * get all grammars in the registry * * @return an array of SchemaGrammars. */ public SchemaGrammar[] getGrammars() { // get the number of grammars int count = fGrammarRegistry.size() + (fNoNSGrammar==null ? 0 : 1); SchemaGrammar[] grammars = new SchemaGrammar[count]; // get grammars with target namespace Enumeration schemas = fGrammarRegistry.elements(); int i = 0; while (schemas.hasMoreElements()) grammars[i++] = (SchemaGrammar)schemas.nextElement(); // add the grammar without target namespace, if any if (fNoNSGrammar != null) grammars[count-1] = fNoNSGrammar; return grammars; } /** * Clear the registry. * REVISIT: update to use another XSGrammarBucket */ public void reset() { fNoNSGrammar = null; fGrammarRegistry.clear(); } } // class XSGrammarBucket