xsdhandler.java

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    private String emptyString2Null(String ns) {
        return ns == XMLSymbols.EMPTY_STRING ? null : ns;
    }

    // This vector stores strings which are combinations of the
    // publicId and systemId of the inputSource corresponding to a
    // schema document.  This combination is used so that the user's
    // EntityResolver can provide a consistent way of identifying a
    // schema document that is included in multiple other schemas.
    private Hashtable fTraversed = new Hashtable();

    // this hashtable contains a mapping from Document to its systemId
    // this is useful to resolve a uri relative to the referring document
    private Hashtable fDoc2SystemId = new Hashtable();

    // the primary XSDocumentInfo we were called to parse
    private XSDocumentInfo fRoot = null;

    // This hashtable's job is to act as a link between the document
    // node at the root of the parsed schema's tree and its
    // XSDocumentInfo object.
    private Hashtable fDoc2XSDocumentMap = new Hashtable();

    // map between <redefine> elements and the XSDocumentInfo
    // objects that correspond to the documents being redefined.
    private Hashtable fRedefine2XSDMap = new Hashtable();
    
    // map between <redefine> elements and the namespace support
    private Hashtable fRedefine2NSSupport = new Hashtable();

    // these objects store a mapping between the names of redefining
    // groups/attributeGroups and the groups/AttributeGroups which
    // they redefine by restriction (implicitly).  It is up to the
    // Group and AttributeGroup traversers to check these restrictions for
    // validity.
    private Hashtable fRedefinedRestrictedAttributeGroupRegistry = new Hashtable();
    private Hashtable fRedefinedRestrictedGroupRegistry = new Hashtable();

    // a variable storing whether the last schema document
    // processed (by getSchema) was a duplicate.
    private boolean fLastSchemaWasDuplicate;

    // the XMLErrorReporter
    private XMLErrorReporter fErrorReporter;
    private XMLEntityResolver fEntityResolver;

    // the XSAttributeChecker
    private XSAttributeChecker fAttributeChecker;

    // the symbol table
    private SymbolTable fSymbolTable;

    // the GrammarResolver
    private XSGrammarBucket fGrammarBucket;
    
    // the Grammar description
    private XSDDescription fSchemaGrammarDescription;
    
    // the Grammar Pool
    private XMLGrammarPool fGrammarPool;

    //************ Traversers **********
    XSDAttributeGroupTraverser fAttributeGroupTraverser;
    XSDAttributeTraverser fAttributeTraverser;
    XSDComplexTypeTraverser fComplexTypeTraverser;
    XSDElementTraverser fElementTraverser;
    XSDGroupTraverser fGroupTraverser;
    XSDKeyrefTraverser fKeyrefTraverser;
    XSDNotationTraverser fNotationTraverser;
    XSDSimpleTypeTraverser fSimpleTypeTraverser;
    XSDUniqueOrKeyTraverser fUniqueOrKeyTraverser;
    XSDWildcardTraverser fWildCardTraverser;

    //DOMParser fSchemaParser;
    SchemaParsingConfig fSchemaParser;

    // these data members are needed for the deferred traversal
    // of local elements.

    // the initial size of the array to store deferred local elements
    private static final int INIT_STACK_SIZE = 30;
    // the incremental size of the array to store deferred local elements
    private static final int INC_STACK_SIZE  = 10;
    // current position of the array (# of deferred local elements)
    private int fLocalElemStackPos = 0;

    private XSParticleDecl[] fParticle = new XSParticleDecl[INIT_STACK_SIZE];
    private Element[] fLocalElementDecl = new Element[INIT_STACK_SIZE];
    private int[] fAllContext = new int[INIT_STACK_SIZE];
    private XSObject[] fParent = new XSObject[INIT_STACK_SIZE];
    private String [][] fLocalElemNamespaceContext = new String [INIT_STACK_SIZE][1];

    // these data members are needed for the deferred traversal
    // of keyrefs.

    // the initial size of the array to store deferred keyrefs
    private static final int INIT_KEYREF_STACK = 2;
    // the incremental size of the array to store deferred keyrefs
    private static final int INC_KEYREF_STACK_AMOUNT = 2;
    // current position of the array (# of deferred keyrefs)
    private int fKeyrefStackPos = 0;

    private Element [] fKeyrefs = new Element[INIT_KEYREF_STACK];
    private XSElementDecl [] fKeyrefElems = new XSElementDecl [INIT_KEYREF_STACK];
    private String [][] fKeyrefNamespaceContext = new String[INIT_KEYREF_STACK][1];

    // Constructors
    public XSDHandler(){
        fSchemaParser = new SchemaParsingConfig();
    }

    // it should be possible to use the same XSDHandler to parse
    // multiple schema documents; this will allow one to be
    // constructed.
    public XSDHandler (XSGrammarBucket gBucket) {
        this();
        fGrammarBucket = gBucket;

        // Note: don't use SchemaConfiguration internally
        //       we will get stack overflaw because
        //       XMLSchemaValidator will be instantiating XSDHandler...
        fSchemaGrammarDescription = new XSDDescription();
    } // end constructor


    

    /**
     * This method initiates the parse of a schema.  It will likely be
     * called from the Validator and it will make the
     * resulting grammar available; it returns a reference to this object just
     * in case.  A reset(XMLComponentManager) must be called before this methods is called.
     * @param is
     * @param desc
     * @param locationPairs
     * @return
     * @throws IOException
     */
    public SchemaGrammar parseSchema(Source source, XSDDescription desc,
                                     Hashtable locationPairs)
            throws IOException {
        fLocationPairs = locationPairs;
               
        if (fSchemaParser != null) {
            fSchemaParser.resetNodePool();
        }
        
        SchemaGrammar grammar = null;
        String schemaNamespace  = null;
        short referType = desc.getContextType();
        // if loading using JAXP schemaSource property, or using grammar caching loadGrammar
        // the desc.targetNamespace is always null.
        // Therefore we should not attempt to find out if 
        // the schema is already in the bucket, since in the case we have
        // no namespace schema in the bucket, findGrammar will always return the 
        // no namespace schema.
        if (referType != XSDDescription.CONTEXT_PREPARSE){        
            // first try to find it in the bucket/pool, return if one is found
            grammar = findGrammar(desc);
            if (grammar != null)
                return grammar;
            schemaNamespace = desc.getTargetNamespace();
            // handle empty string URI as null
            if (schemaNamespace != null) {
                schemaNamespace = fSymbolTable.addSymbol(schemaNamespace);
            }   
        }

        // before parsing a schema, need to clear registries associated with
        // parsing schemas
        prepareForParse();

        // first phase:  construct trees.
        Document schemaRoot = getSchema(schemaNamespace, source,
                                        referType == XSDDescription.CONTEXT_PREPARSE,
                                        referType, null);
        if (schemaRoot == null) {
            // something went wrong right off the hop
            return null;
        }
        if ( referType == XSDDescription.CONTEXT_PREPARSE) {
            Element schemaElem = DOMUtil.getRoot(schemaRoot);
            schemaNamespace = DOMUtil.getAttrValue(schemaElem, SchemaSymbols.ATT_TARGETNAMESPACE);
            if(schemaNamespace != null && schemaNamespace.length() > 0) {
                // Since now we've discovered a namespace, we need to update xsd key
                // and store this schema in traversed schemas bucket
                schemaNamespace = fSymbolTable.addSymbol(schemaNamespace);
                desc.setTargetNamespace(schemaNamespace);
            }
            else {
                schemaNamespace = null;
            }
            grammar = findGrammar(desc);
            if (grammar != null)
                return grammar;
            String schemaId = source.getSystemId();
            XSDKey key = new XSDKey(schemaId, referType, schemaNamespace);
            fTraversed.put(key, schemaRoot );
            if (schemaId != null) {
                fDoc2SystemId.put(schemaRoot, schemaId );
            }            
        } 

        // before constructing trees and traversing a schema, need to reset
        // all traversers and clear all registries
        prepareForTraverse();

        fRoot = constructTrees(schemaRoot, source.getSystemId(), desc);
        if (fRoot == null) {
            return null;
        }

        // second phase:  fill global registries.
        buildGlobalNameRegistries();

        // third phase:  call traversers
        traverseSchemas();

        // fourth phase: handle local element decls
        traverseLocalElements();

        // fifth phase:  handle Keyrefs
        resolveKeyRefs();

        // sixth phase:  validate attribute of non-schema namespaces
        // REVISIT: skip this for now. we really don't want to do it.
        //fAttributeChecker.checkNonSchemaAttributes(fGrammarBucket);

        // seventh phase:  store imported grammars
        // for all grammars with <import>s
        for (int i = fAllTNSs.size() - 1; i >= 0; i--) {
            // get its target namespace
            String tns = (String)fAllTNSs.elementAt(i);
            // get all namespaces it imports
            Vector ins = (Vector)fImportMap.get(tns);
            // get the grammar
            SchemaGrammar sg = fGrammarBucket.getGrammar(emptyString2Null(tns));
            if (sg == null)
                continue;
            SchemaGrammar isg;
            // for imported namespace
            int count = 0;
            for (int j = 0; j < ins.size(); j++) {
                // get imported grammar
                isg = fGrammarBucket.getGrammar((String)ins.elementAt(j));
                // reuse the same vector
                if (isg != null)
                    ins.setElementAt(isg, count++);
            }
            ins.setSize(count);
            // set the imported grammars
            sg.setImportedGrammars(ins);
        }

        // and return.
        return fGrammarBucket.getGrammar(fRoot.fTargetNamespace);
    } // end parseSchema

    /**
     * Pull the grammar out of the bucket simply using
     * its TNS as a key
     */
    SchemaGrammar getGrammar(String tns) {
        return fGrammarBucket.getGrammar(tns);