/*
 * Copyright (c) 2007, 2020, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * 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 com.sun.org.apache.xerces.internal.parsers;

import java.io.IOException;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.util.EntityResolverWrapper;
import com.sun.org.apache.xerces.internal.util.EntityResolver2Wrapper;
import com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper;
import com.sun.org.apache.xerces.internal.util.SAXMessageFormatter;
import com.sun.org.apache.xerces.internal.util.Status;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.utils.XMLSecurityManager;
import com.sun.org.apache.xerces.internal.utils.XMLSecurityPropertyManager;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
import com.sun.org.apache.xerces.internal.xni.parser.XMLParseException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLParserConfiguration;
import java.io.CharConversionException;
import org.w3c.dom.Node;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXParseException;
import org.xml.sax.ext.EntityResolver2;
import org.xml.sax.helpers.LocatorImpl;

/**
 * This is the main Xerces DOM parser class. It uses the abstract DOM
 * parser with a document scanner, a dtd scanner, and a validator, as
 * well as a grammar pool.
 *
 * @author Arnaud  Le Hors, IBM
 * @author Andy Clark, IBM
 *
 */
public class DOMParser
    extends AbstractDOMParser {

    //
    // Constants
    //

    // features

    /** Feature identifier: EntityResolver2. */
    protected static final String USE_ENTITY_RESOLVER2 =
        Constants.SAX_FEATURE_PREFIX + Constants.USE_ENTITY_RESOLVER2_FEATURE;

    protected static final String REPORT_WHITESPACE =
            Constants.SUN_SCHEMA_FEATURE_PREFIX + Constants.SUN_REPORT_IGNORED_ELEMENT_CONTENT_WHITESPACE;

    /** Property identifier: Security property manager. */
    private static final String XML_SECURITY_PROPERTY_MANAGER =
            Constants.XML_SECURITY_PROPERTY_MANAGER;

    // recognized features:
    private static final String[] RECOGNIZED_FEATURES = {
        REPORT_WHITESPACE
    };

    // properties

    /** Property identifier: symbol table. */
    protected static final String SYMBOL_TABLE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;

    /** Property identifier: XML grammar pool. */
    protected static final String XMLGRAMMAR_POOL =
        Constants.XERCES_PROPERTY_PREFIX+Constants.XMLGRAMMAR_POOL_PROPERTY;

    /** Recognized properties. */
    private static final String[] RECOGNIZED_PROPERTIES = {
        SYMBOL_TABLE,
        XMLGRAMMAR_POOL,
    };

    //
    // Data
    //

    // features

    /** Use EntityResolver2. */
    protected boolean fUseEntityResolver2 = true;

    //
    // Constructors
    //

    /**
     * Constructs a DOM parser using the specified parser configuration.
     */
    public DOMParser(XMLParserConfiguration config) {
        super(config);
    } // <init>(XMLParserConfiguration)

    /**
     * Constructs a DOM parser using the dtd/xml schema parser configuration.
     */
    public DOMParser() {
        this(null, null);
    } // <init>()

    /**
     * Constructs a DOM parser using the specified symbol table.
     */
    public DOMParser(SymbolTable symbolTable) {
        this(symbolTable, null);
    } // <init>(SymbolTable)


    /**
     * Constructs a DOM parser using the specified symbol table and
     * grammar pool.
     */
    public DOMParser(SymbolTable symbolTable, XMLGrammarPool grammarPool) {
        super(new XIncludeAwareParserConfiguration());

        // set properties
        fConfiguration.addRecognizedProperties(RECOGNIZED_PROPERTIES);
        if (symbolTable != null) {
            fConfiguration.setProperty(SYMBOL_TABLE, symbolTable);
        }
        if (grammarPool != null) {
            fConfiguration.setProperty(XMLGRAMMAR_POOL, grammarPool);
        }

        fConfiguration.addRecognizedFeatures(RECOGNIZED_FEATURES);

    } // <init>(SymbolTable,XMLGrammarPool)

    //
    // XMLReader methods
    //

    /**
     * Parses the input source specified by the given system identifier.
     * <p>
     * This method is equivalent to the following:
     * <pre>
     *     parse(new InputSource(systemId));
     * </pre>
     *
     * @param systemId The system identifier (URI).
     *
     * @exception org.xml.sax.SAXException Throws exception on SAX error.
     * @exception java.io.IOException Throws exception on i/o error.
     */
    public void parse(String systemId) throws SAXException, IOException {

        // parse document
        XMLInputSource source = new XMLInputSource(null, systemId, null, false);
        try {
            parse(source);
        }

        // wrap XNI exceptions as SAX exceptions
        catch (XMLParseException e) {
            Exception ex = e.getException();
            if (ex == null || ex instanceof CharConversionException) {
                // must be a parser exception; mine it for locator info and throw
                // a SAXParseException
                LocatorImpl locatorImpl = new LocatorImpl();
                locatorImpl.setPublicId(e.getPublicId());
                locatorImpl.setSystemId(e.getExpandedSystemId());
                locatorImpl.setLineNumber(e.getLineNumber());
                locatorImpl.setColumnNumber(e.getColumnNumber());
                throw (ex == null) ?
                        new SAXParseException(e.getMessage(), locatorImpl) :
                        new SAXParseException(e.getMessage(), locatorImpl, ex);
            }
            if (ex instanceof SAXException) {
                // why did we create an XMLParseException?
                throw (SAXException)ex;
            }
            if (ex instanceof IOException) {
                throw (IOException)ex;
            }
            throw new SAXException(ex);
        }
        catch (XNIException e) {
            e.printStackTrace();
            Exception ex = e.getException();
            if (ex == null) {
                throw new SAXException(e.getMessage());
            }
            if (ex instanceof SAXException) {
                throw (SAXException)ex;
            }
            if (ex instanceof IOException) {
                throw (IOException)ex;
            }
            throw new SAXException(ex);
        }

    } // parse(String)

    /**
     * parse
     *
     * @param inputSource
     *
     * @exception org.xml.sax.SAXException
     * @exception java.io.IOException
     */
    public void parse(InputSource inputSource)
        throws SAXException, IOException {

        // parse document
        try {
            XMLInputSource xmlInputSource =
                new XMLInputSource(inputSource.getPublicId(),
                                   inputSource.getSystemId(),
                                   null, false);
            xmlInputSource.setByteStream(inputSource.getByteStream());
            xmlInputSource.setCharacterStream(inputSource.getCharacterStream());
            xmlInputSource.setEncoding(inputSource.getEncoding());
            parse(xmlInputSource);
        }

        // wrap XNI exceptions as SAX exceptions
        catch (XMLParseException e) {
            Exception ex = e.getException();
            if (ex == null || ex instanceof CharConversionException) {
                // must be a parser exception; mine it for locator info and throw
                // a SAXParseException
                LocatorImpl locatorImpl = new LocatorImpl();
                locatorImpl.setPublicId(e.getPublicId());
                locatorImpl.setSystemId(e.getExpandedSystemId());
                locatorImpl.setLineNumber(e.getLineNumber());
                locatorImpl.setColumnNumber(e.getColumnNumber());
                throw (ex == null) ?
                        new SAXParseException(e.getMessage(), locatorImpl) :
                        new SAXParseException(e.getMessage(), locatorImpl, ex);
            }
            if (ex instanceof SAXException) {
                // why did we create an XMLParseException?
                throw (SAXException)ex;
            }
            if (ex instanceof IOException) {
                throw (IOException)ex;
            }
            throw new SAXException(ex);
        }
        catch (XNIException e) {
            Exception ex = e.getException();
            if (ex == null) {
                throw new SAXException(e.getMessage());
            }
            if (ex instanceof SAXException) {
                throw (SAXException)ex;
            }
            if (ex instanceof IOException) {
                throw (IOException)ex;
            }
            throw new SAXException(ex);
        }

    } // parse(InputSource)

    /**
     * Sets the resolver used to resolve external entities. The EntityResolver
     * interface supports resolution of public and system identifiers.
     *
     * @param resolver The new entity resolver. Passing a null value will
     *                 uninstall the currently installed resolver.
     */
    public void setEntityResolver(EntityResolver resolver) {

        try {
            XMLEntityResolver xer = (XMLEntityResolver) fConfiguration.getProperty(ENTITY_RESOLVER);
            if (fUseEntityResolver2 && resolver instanceof EntityResolver2) {
                if (xer instanceof EntityResolver2Wrapper) {
                    EntityResolver2Wrapper er2w = (EntityResolver2Wrapper) xer;
                    er2w.setEntityResolver((EntityResolver2) resolver);
                }
                else {
                    fConfiguration.setProperty(ENTITY_RESOLVER,
                            new EntityResolver2Wrapper((EntityResolver2) resolver));
                }
            }
            else {
                if (xer instanceof EntityResolverWrapper) {
                    EntityResolverWrapper erw = (EntityResolverWrapper) xer;
                    erw.setEntityResolver(resolver);
                }
                else {
                    fConfiguration.setProperty(ENTITY_RESOLVER,
                            new EntityResolverWrapper(resolver));
                }
            }
        }
        catch (XMLConfigurationException e) {
            // do nothing
        }

    } // setEntityResolver(EntityResolver)

    /**
     * Return the current entity resolver.
     *
     * @return The current entity resolver, or null if none
     *         has been registered.
     * @see #setEntityResolver
     */
    public EntityResolver getEntityResolver() {

        EntityResolver entityResolver = null;
        try {
            XMLEntityResolver xmlEntityResolver =
                (XMLEntityResolver)fConfiguration.getProperty(ENTITY_RESOLVER);
            if (xmlEntityResolver != null) {
                if (xmlEntityResolver instanceof EntityResolverWrapper) {
                    entityResolver =
                        ((EntityResolverWrapper) xmlEntityResolver).getEntityResolver();
                }
                else if (xmlEntityResolver instanceof EntityResolver2Wrapper) {
                    entityResolver =
                        ((EntityResolver2Wrapper) xmlEntityResolver).getEntityResolver();
                }
            }
        }
        catch (XMLConfigurationException e) {
            // do nothing
        }
        return entityResolver;

    } // getEntityResolver():EntityResolver

    /**
     * Allow an application to register an error event handler.
     *
     * <p>If the application does not register an error handler, all
     * error events reported by the SAX parser will be silently
     * ignored; however, normal processing may not continue.  It is
     * highly recommended that all SAX applications implement an
     * error handler to avoid unexpected bugs.</p>
     *
     * <p>Applications may register a new or different handler in the
     * middle of a parse, and the SAX parser must begin using the new
     * handler immediately.</p>
     *
     * @param errorHandler The error handler.
     * @exception java.lang.NullPointerException If the handler
     *            argument is null.
     * @see #getErrorHandler
     */
    public void setErrorHandler(ErrorHandler errorHandler) {

        try {
            XMLErrorHandler xeh = (XMLErrorHandler) fConfiguration.getProperty(ERROR_HANDLER);
            if (xeh instanceof ErrorHandlerWrapper) {
                ErrorHandlerWrapper ehw = (ErrorHandlerWrapper) xeh;
                ehw.setErrorHandler(errorHandler);
            }
            else {
                fConfiguration.setProperty(ERROR_HANDLER,
                        new ErrorHandlerWrapper(errorHandler));
            }
        }
        catch (XMLConfigurationException e) {
            // do nothing
        }

    } // setErrorHandler(ErrorHandler)

    /**
     * Return the current error handler.
     *
     * @return The current error handler, or null if none
     *         has been registered.
     * @see #setErrorHandler
     */
    public ErrorHandler getErrorHandler() {

        ErrorHandler errorHandler = null;
        try {
            XMLErrorHandler xmlErrorHandler =
                (XMLErrorHandler)fConfiguration.getProperty(ERROR_HANDLER);
            if (xmlErrorHandler != null &&
                xmlErrorHandler instanceof ErrorHandlerWrapper) {
                errorHandler = ((ErrorHandlerWrapper)xmlErrorHandler).getErrorHandler();
            }
        }
        catch (XMLConfigurationException e) {
            // do nothing
        }
        return errorHandler;

    } // getErrorHandler():ErrorHandler

    /**
     * Set the state of any feature in a SAX2 parser.  The parser
     * might not recognize the feature, and if it does recognize
     * it, it might not be able to fulfill the request.
     *
     * @param featureId The unique identifier (URI) of the feature.
     * @param state The requested state of the feature (true or false).
     *
     * @exception SAXNotRecognizedException If the
     *            requested feature is not known.
     * @exception SAXNotSupportedException If the
     *            requested feature is known, but the requested
     *            state is not supported.
     */
    public void setFeature(String featureId, boolean state)
        throws SAXNotRecognizedException, SAXNotSupportedException {

        try {

            // http://xml.org/sax/features/use-entity-resolver2
            //   controls whether the methods of an object implementing
            //   org.xml.sax.ext.EntityResolver2 will be used by the parser.
            //
            if (featureId.equals(USE_ENTITY_RESOLVER2)) {
                if (state != fUseEntityResolver2) {
                    fUseEntityResolver2 = state;
                    // Refresh EntityResolver wrapper.
                    setEntityResolver(getEntityResolver());
                }
                return;
            }

            //
            // Default handling
            //

            fConfiguration.setFeature(featureId, state);
        }
        catch (XMLConfigurationException e) {
            String identifier = e.getIdentifier();
            if (e.getType() == Status.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "feature-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "feature-not-supported", new Object [] {identifier}));
            }
        }

    } // setFeature(String,boolean)

    /**
     * Query the state of a feature.
     *
     * Query the current state of any feature in a SAX2 parser.  The
     * parser might not recognize the feature.
     *
     * @param featureId The unique identifier (URI) of the feature
     *                  being set.
     * @return The current state of the feature.
     * @exception org.xml.sax.SAXNotRecognizedException If the
     *            requested feature is not known.
     * @exception SAXNotSupportedException If the
     *            requested feature is known but not supported.
     */
    public boolean getFeature(String featureId)
        throws SAXNotRecognizedException, SAXNotSupportedException {

        try {

            // http://xml.org/sax/features/use-entity-resolver2
            //   controls whether the methods of an object implementing
            //   org.xml.sax.ext.EntityResolver2 will be used by the parser.
            //
            if (featureId.equals(USE_ENTITY_RESOLVER2)) {
                return fUseEntityResolver2;
            }

            //
            // Default handling
            //

            return fConfiguration.getFeature(featureId);
        }
        catch (XMLConfigurationException e) {
            String identifier = e.getIdentifier();
            if (e.getType() == Status.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "feature-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "feature-not-supported", new Object [] {identifier}));
            }
        }

    } // getFeature(String):boolean

    /**
     * Set the value of any property in a SAX2 parser.  The parser
     * might not recognize the property, and if it does recognize
     * it, it might not support the requested value.
     *
     * @param propertyId The unique identifier (URI) of the property
     *                   being set.
     * @param value The value to which the property is being set.
     *
     * @exception SAXNotRecognizedException If the
     *            requested property is not known.
     * @exception SAXNotSupportedException If the
     *            requested property is known, but the requested
     *            value is not supported.
     */
    public void setProperty(String propertyId, Object value)
        throws SAXNotRecognizedException, SAXNotSupportedException {
        /**
         * It's possible for users to set a security manager through the interface.
         * If it's the old SecurityManager, convert it to the new XMLSecurityManager
         */
        if (propertyId.equals(Constants.SECURITY_MANAGER)) {
            securityManager = XMLSecurityManager.convert(value, securityManager);
            setProperty0(Constants.SECURITY_MANAGER, securityManager);
            return;
        }
        if (propertyId.equals(Constants.XML_SECURITY_PROPERTY_MANAGER)) {
            if (value == null) {
                securityPropertyManager = new XMLSecurityPropertyManager();
            } else {
                securityPropertyManager = (XMLSecurityPropertyManager)value;
            }
            setProperty0(Constants.XML_SECURITY_PROPERTY_MANAGER, securityPropertyManager);
            return;
        }

        if (securityManager == null) {
            securityManager = new XMLSecurityManager(true);
            setProperty0(Constants.SECURITY_MANAGER, securityManager);
        }

        if (securityPropertyManager == null) {
            securityPropertyManager = new XMLSecurityPropertyManager();
            setProperty0(Constants.XML_SECURITY_PROPERTY_MANAGER, securityPropertyManager);
        }
        int index = securityPropertyManager.getIndex(propertyId);

        if (index > -1) {
            /**
             * this is a direct call to this parser, not a subclass since
             * internally the support of this property is done through
             * XMLSecurityPropertyManager
             */
            securityPropertyManager.setValue(index, XMLSecurityPropertyManager.State.APIPROPERTY, (String)value);
        } else {
            //check if the property is managed by security manager
            if (!securityManager.setLimit(propertyId, XMLSecurityManager.State.APIPROPERTY, value)) {
                //fall back to the default configuration to handle the property
                setProperty0(propertyId, value);
            }
        }
    }

    public void setProperty0(String propertyId, Object value)
        throws SAXNotRecognizedException, SAXNotSupportedException {
        try {
            fConfiguration.setProperty(propertyId, value);
        }
        catch (XMLConfigurationException e) {
            String identifier = e.getIdentifier();
            if (e.getType() == Status.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "property-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "property-not-supported", new Object [] {identifier}));
            }
        }

    } // setProperty(String,Object)

    /**
     * Query the value of a property.
     *
     * Return the current value of a property in a SAX2 parser.
     * The parser might not recognize the property.
     *
     * @param propertyId The unique identifier (URI) of the property
     *                   being set.
     * @return The current value of the property.
     * @exception org.xml.sax.SAXNotRecognizedException If the
     *            requested property is not known.
     * @exception SAXNotSupportedException If the
     *            requested property is known but not supported.
     */
    public Object getProperty(String propertyId)
        throws SAXNotRecognizedException, SAXNotSupportedException {

       if (propertyId.equals(CURRENT_ELEMENT_NODE)) {
           boolean deferred = false;
           try {
               deferred = getFeature(DEFER_NODE_EXPANSION);
           }
           catch (XMLConfigurationException e){
               // ignore
           }
           if (deferred) {
               throw new SAXNotSupportedException("Current element node cannot be queried when node expansion is deferred.");
           }
           return (fCurrentNode!=null &&
                   fCurrentNode.getNodeType() == Node.ELEMENT_NODE)? fCurrentNode:null;
       }

        try {
            XMLSecurityPropertyManager spm = (XMLSecurityPropertyManager)
                    fConfiguration.getProperty(XML_SECURITY_PROPERTY_MANAGER);
            int index = spm.getIndex(propertyId);
            if (index > -1) {
                return spm.getValueByIndex(index);
            }

            return fConfiguration.getProperty(propertyId);
        }
        catch (XMLConfigurationException e) {
            String identifier = e.getIdentifier();
            if (e.getType() == Status.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "property-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                    SAXMessageFormatter.formatMessage(fConfiguration.getLocale(),
                    "property-not-supported", new Object [] {identifier}));
            }
        }

    } // getProperty(String):Object

    /**
     * Returns this parser's XMLParserConfiguration.
     */
    public XMLParserConfiguration getXMLParserConfiguration() {
        return fConfiguration;
    } // getXMLParserConfiguration():XMLParserConfiguration

} // class DOMParser
