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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.impl.xs.opti;

import java.io.IOException;

import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.XMLErrorReporter;
import org.apache.xerces.impl.xs.SchemaSymbols;
import org.apache.xerces.impl.xs.XSMessageFormatter;
import org.apache.xerces.util.XMLAttributesImpl;
import org.apache.xerces.util.XMLChar;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.NamespaceContext;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XMLLocator;
import org.apache.xerces.xni.XMLString;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLEntityResolver;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLParserConfiguration;
import org.w3c.dom.Document;

/**
 * @xerces.internal  
 * 
 * @author Rahul Srivastava, Sun Microsystems Inc.
 * @author Sandy Gao, IBM
 *
 * @version $Id: SchemaDOMParser.java 963267 2010-07-12 12:48:37Z mrglavas $
 */
public class SchemaDOMParser extends DefaultXMLDocumentHandler {
    
    //
    // Data
    //
    
    /** Property identifier: error reporter. */
    public static final String ERROR_REPORTER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;
    
    /** Feature identifier: generate synthetic annotations. */
    public static final String GENERATE_SYNTHETIC_ANNOTATION =
        Constants.XERCES_FEATURE_PREFIX + Constants.GENERATE_SYNTHETIC_ANNOTATIONS_FEATURE;
    
    // the locator containing line/column information
    protected XMLLocator   fLocator;
    
    // namespace context, needed for producing
    // representations of annotations
    protected NamespaceContext fNamespaceContext = null;
    
    SchemaDOM schemaDOM;
    
    XMLParserConfiguration config;
    
    //
    // Constructors
    //
    
    /** Default constructor. */
    public SchemaDOMParser(XMLParserConfiguration config) {
        this.config = config;
        config.setDocumentHandler(this);
        config.setDTDHandler(this);
        config.setDTDContentModelHandler(this);
    }
    
    // Reference to the current annotation element.
    private ElementImpl fCurrentAnnotationElement;
    // where an annotation element itself begins
    // -1 means not in an annotation's scope
    private int fAnnotationDepth = -1;
    // Where xs:appinfo or xs:documentation starts;
    // -1 means not in the scope of either of the two elements.
    private int fInnerAnnotationDepth = -1;
    // The current element depth
    private int fDepth = -1;
    // Use to report the error when characters are not allowed.
    XMLErrorReporter fErrorReporter;
    
    // fields for generate-synthetic annotations feature
    private boolean fGenerateSyntheticAnnotation = false;
    private BooleanStack fHasNonSchemaAttributes = new BooleanStack();
    private BooleanStack fSawAnnotation = new BooleanStack();
    private XMLAttributes fEmptyAttr = new XMLAttributesImpl();
    
    //
    // XMLDocumentHandler methods
    //
    
    public void startDocument(XMLLocator locator, String encoding, 
            NamespaceContext namespaceContext, Augmentations augs)
    throws XNIException {
        fErrorReporter = (XMLErrorReporter)config.getProperty(ERROR_REPORTER);
        fGenerateSyntheticAnnotation = config.getFeature(GENERATE_SYNTHETIC_ANNOTATION);
        fHasNonSchemaAttributes.clear();
        fSawAnnotation.clear();
        schemaDOM = new SchemaDOM();
        fCurrentAnnotationElement = null;
        fAnnotationDepth = -1;
        fInnerAnnotationDepth = -1;
        fDepth = -1;
        fLocator = locator;
        fNamespaceContext = namespaceContext;
        schemaDOM.setDocumentURI(locator.getExpandedSystemId());
    } // startDocument(XMLLocator,String,NamespaceContext, Augmentations)
    
    /**
     * The end of the document.
     * @param augs     Additional information that may include infoset augmentations
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void endDocument(Augmentations augs) throws XNIException {
        // To debug the DOM created uncomment the line below
        // schemaDOM.printDOM();
    } // endDocument()
    
    
    /**
     * A comment.
     * 
     * @param text   The text in the comment.
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by application to signal an error.
     */
    public void comment(XMLString text, Augmentations augs) throws XNIException {
        if(fAnnotationDepth > -1) {
            schemaDOM.comment(text);
        }
    }
    
    /**
     * A processing instruction. Processing instructions consist of a
     * target name and, optionally, text data. The data is only meaningful
     * to the application.
     * 
     * Typically, a processing instruction's data will contain a series
     * of pseudo-attributes. These pseudo-attributes follow the form of
     * element attributes but are not parsed or presented
     * to the application as anything other than text. The application is
     * responsible for parsing the data.
     * 
     * @param target The target.
     * @param data   The data or null if none specified.
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void processingInstruction(String target, XMLString data, Augmentations augs)
    throws XNIException {
        if (fAnnotationDepth > -1) {
            schemaDOM.processingInstruction(target, data);
        }
    }
    
    /**
     * Character content.
     * 
     * @param text   The content.
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void characters(XMLString text, Augmentations augs) throws XNIException {
        // when it's not within xs:appinfo or xs:documentation
        if (fInnerAnnotationDepth == -1 ) {
            for (int i=text.offset; i 0) {
                        fSawAnnotation.pop();
                    }
                    fSawAnnotation.push(true);
                }
                fAnnotationDepth = fDepth;
                schemaDOM.startAnnotation(element, attributes, fNamespaceContext);
                fCurrentAnnotationElement = schemaDOM.startElement(element, attributes, 
                        fLocator.getLineNumber(),
                        fLocator.getColumnNumber(),
                        fLocator.getCharacterOffset());
                return;
            } 
            else if (element.uri == SchemaSymbols.URI_SCHEMAFORSCHEMA && fGenerateSyntheticAnnotation) {
                fSawAnnotation.push(false);
                fHasNonSchemaAttributes.push(hasNonSchemaAttributes(element, attributes));
            }
        } 
        else if (fDepth == fAnnotationDepth + 1) {
            fInnerAnnotationDepth = fDepth;
            schemaDOM.startAnnotationElement(element, attributes);
        } 
        else {
            schemaDOM.startAnnotationElement(element, attributes);
            // avoid falling through; don't call startElement in this case
            return;
        }
        schemaDOM.startElement(element, attributes, 
                fLocator.getLineNumber(),
                fLocator.getColumnNumber(),
                fLocator.getCharacterOffset());
        
    }
    
    
    /**
     * An empty element.
     * 
     * @param element    The name of the element.
     * @param attributes The element attributes.
     * @param augs       Additional information that may include infoset augmentations
     *                   
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void emptyElement(QName element, XMLAttributes attributes, Augmentations augs)
    throws XNIException {
        
        if (fGenerateSyntheticAnnotation && fAnnotationDepth == -1 && 
                element.uri == SchemaSymbols.URI_SCHEMAFORSCHEMA && element.localpart != SchemaSymbols.ELT_ANNOTATION && hasNonSchemaAttributes(element, attributes)) { 
            
            schemaDOM.startElement(element, attributes,
                    fLocator.getLineNumber(),
                    fLocator.getColumnNumber(),
                    fLocator.getCharacterOffset());
            
            attributes.removeAllAttributes();
            String schemaPrefix = fNamespaceContext.getPrefix(SchemaSymbols.URI_SCHEMAFORSCHEMA);
            final String annRawName = (schemaPrefix.length() == 0) ? SchemaSymbols.ELT_ANNOTATION : (schemaPrefix + ':' + SchemaSymbols.ELT_ANNOTATION);
            schemaDOM.startAnnotation(annRawName, attributes, fNamespaceContext);
            final String elemRawName = (schemaPrefix.length() == 0) ? SchemaSymbols.ELT_DOCUMENTATION : (schemaPrefix + ':' + SchemaSymbols.ELT_DOCUMENTATION);
            schemaDOM.startAnnotationElement(elemRawName, attributes);
            schemaDOM.charactersRaw("SYNTHETIC_ANNOTATION");     
            schemaDOM.endSyntheticAnnotationElement(elemRawName, false);
            schemaDOM.endSyntheticAnnotationElement(annRawName, true);
            
            schemaDOM.endElement();
            
            return;
        }
        // the order of events that occurs here is:
        //   schemaDOM.startAnnotation/startAnnotationElement (if applicable)
        //   schemaDOM.emptyElement  (basically the same as startElement then endElement)
        //   schemaDOM.endAnnotationElement (if applicable)
        // the order of events that would occur if this was :
        //   schemaDOM.startAnnotation/startAnnotationElement (if applicable)
        //   schemaDOM.startElement
        //   schemaDOM.endAnnotationElement (if applicable)
        //   schemaDOM.endElementElement
        // Thus, we can see that the order of events isn't the same.  However, it doesn't
        // seem to matter.  -- PJM
        if (fAnnotationDepth == -1) {
            // this is messed up, but a case to consider:
            if (element.uri == SchemaSymbols.URI_SCHEMAFORSCHEMA &&
                    element.localpart == SchemaSymbols.ELT_ANNOTATION) {
                schemaDOM.startAnnotation(element, attributes, fNamespaceContext);
            }
        } 
        else {
            schemaDOM.startAnnotationElement(element, attributes);
        }
        
        ElementImpl newElem = schemaDOM.emptyElement(element, attributes, 
                fLocator.getLineNumber(),
                fLocator.getColumnNumber(),
                fLocator.getCharacterOffset());
        
        if (fAnnotationDepth == -1) {
            // this is messed up, but a case to consider:
            if (element.uri == SchemaSymbols.URI_SCHEMAFORSCHEMA &&
                    element.localpart == SchemaSymbols.ELT_ANNOTATION) {
                schemaDOM.endAnnotation(element, newElem);
            }
        } 
        else {
            schemaDOM.endAnnotationElement(element);
        } 
    }
    
    
    /**
     * The end of an element.
     * 
     * @param element The name of the element.
     * @param augs    Additional information that may include infoset augmentations
     *                
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void endElement(QName element, Augmentations augs) throws XNIException {
        
        // when we reach the endElement of xs:appinfo or xs:documentation,
        // change fInnerAnnotationDepth to -1
        if(fAnnotationDepth > -1) {
            if (fInnerAnnotationDepth == fDepth) {
                fInnerAnnotationDepth = -1;
                schemaDOM.endAnnotationElement(element);
                schemaDOM.endElement();
            } else if (fAnnotationDepth == fDepth) {
                fAnnotationDepth = -1;
                schemaDOM.endAnnotation(element, fCurrentAnnotationElement);
                schemaDOM.endElement();
            } else { // inside a child of annotation
                schemaDOM.endAnnotationElement(element);
            }
        } else { // not in an annotation at all
            if(element.uri == SchemaSymbols.URI_SCHEMAFORSCHEMA && fGenerateSyntheticAnnotation) {
                boolean value = fHasNonSchemaAttributes.pop();
                boolean sawann = fSawAnnotation.pop();
                if (value && !sawann) {
                    String schemaPrefix = fNamespaceContext.getPrefix(SchemaSymbols.URI_SCHEMAFORSCHEMA);
                    final String annRawName = (schemaPrefix.length() == 0) ? SchemaSymbols.ELT_ANNOTATION : (schemaPrefix + ':' + SchemaSymbols.ELT_ANNOTATION);
                    schemaDOM.startAnnotation(annRawName, fEmptyAttr, fNamespaceContext);
                    final String elemRawName = (schemaPrefix.length() == 0) ? SchemaSymbols.ELT_DOCUMENTATION : (schemaPrefix + ':' + SchemaSymbols.ELT_DOCUMENTATION);
                    schemaDOM.startAnnotationElement(elemRawName, fEmptyAttr);
                    schemaDOM.charactersRaw("SYNTHETIC_ANNOTATION");     
                    schemaDOM.endSyntheticAnnotationElement(elemRawName, false);
                    schemaDOM.endSyntheticAnnotationElement(annRawName, true);
                }
            }
            schemaDOM.endElement();
        }
        fDepth--;
        
    }
    
    /**
     * @param attributes
     * @return
     */
    private boolean hasNonSchemaAttributes(QName element, XMLAttributes attributes) {
        final int length = attributes.getLength();
        for (int i = 0; i < length; ++i) {
            String uri = attributes.getURI(i);
            if (uri != null && uri != SchemaSymbols.URI_SCHEMAFORSCHEMA && 
                    uri != NamespaceContext.XMLNS_URI &&
                    !(uri == NamespaceContext.XML_URI && 
                            attributes.getQName(i) == SchemaSymbols.ATT_XML_LANG && element.localpart == SchemaSymbols.ELT_SCHEMA)) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Ignorable whitespace. For this method to be called, the document
     * source must have some way of determining that the text containing
     * only whitespace characters should be considered ignorable. For
     * example, the validator can determine if a length of whitespace
     * characters in the document are ignorable based on the element
     * content model.
     * 
     * @param text   The ignorable whitespace.
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void ignorableWhitespace(XMLString text, Augmentations augs) throws XNIException {
        // unlikely to be called, but you never know...
        if (fAnnotationDepth != -1 ) {
            schemaDOM.characters(text);
        }
    }
    
    /**
     * The start of a CDATA section.
     * 
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void startCDATA(Augmentations augs) throws XNIException {
        // only deal with CDATA boundaries within an annotation.
        if (fAnnotationDepth != -1) {
            schemaDOM.startAnnotationCDATA();
        }
    }
    
    /**
     * The end of a CDATA section.
     * 
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void endCDATA(Augmentations augs) throws XNIException {
        // only deal with CDATA boundaries within an annotation.
        if (fAnnotationDepth != -1) {
            schemaDOM.endAnnotationCDATA();
        }
    }
    
    
    //
    // other methods
    //
    
    /**
     * Returns the DOM document object.
     */
    public Document getDocument() {
        return schemaDOM;
    }
    
    /**
     * Delegates to SchemaParsingConfig.setFeature
     * @param featureId
     * @param state
     */
    public void setFeature(String featureId, boolean state){
    	config.setFeature(featureId, state);
    }
    
    /**
     * Delegates to SchemaParsingConfig.getFeature
     * @param featureId
     * @return boolean
     */
    public boolean getFeature(String featureId){
        return config.getFeature(featureId);
    }
    
    /**
     * Delegates to SchemaParsingConfig.setProperty.
     * @param propertyId
     * @param value
     */
    public void setProperty(String propertyId, Object value){
        config.setProperty(propertyId, value);
    }
    
    /**
     * Delegates to SchemaParsingConfig.getProperty.
     * @param propertyId
     * @return Object
     */
    public Object getProperty(String propertyId){
        return config.getProperty(propertyId);
    }
    
    /**
     * Delegates to SchemaParsingConfig.setEntityResolver.
     * @param er XMLEntityResolver
     */
    public void setEntityResolver(XMLEntityResolver er) {
    	config.setEntityResolver(er);
    }
    
    /**
     * Delegates parsing to SchemaParsingConfig
     * 
     * @param inputSource
     * @throws IOException
     */
    public void parse(XMLInputSource inputSource) throws IOException {
        config.parse(inputSource);
    }
    
    /**
     * Reset SchemaParsingConfig
     */
    public void reset() {
    	((SchemaParsingConfig)config).reset();
    }
    
    /**
     * ResetNodePool on SchemaParsingConfig
     */
    public void resetNodePool() {
    	((SchemaParsingConfig)config).resetNodePool();
    }
    
    /**
     * A simple boolean based stack.
     * 
     * @xerces.internal
     */
    private static final class BooleanStack {

        //
        // Data
        //

        /** Stack depth. */
        private int fDepth;

        /** Stack data. */
        private boolean[] fData;
        
        //
        // Constructor
        //
        
        public BooleanStack () {}

        //
        // Public methods
        //

        /** Returns the size of the stack. */
        public int size() {
            return fDepth;
        }

        /** Pushes a value onto the stack. */
        public void push(boolean value) {
            ensureCapacity(fDepth + 1);
            fData[fDepth++] = value;
        }

        /** Pops a value off of the stack. */
        public boolean pop() {
            return fData[--fDepth];
        }

        /** Clears the stack. */
        public void clear() {
            fDepth = 0;
        }

        //
        // Private methods
        //

        /** Ensures capacity. */
        private void ensureCapacity(int size) {
            if (fData == null) {
                fData = new boolean[32];
            }
            else if (fData.length <= size) {
                boolean[] newdata = new boolean[fData.length * 2];
                System.arraycopy(fData, 0, newdata, 0, fData.length);
                fData = newdata;
            }
        }
    }
}