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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * https://jaxp.dev.java.net/CDDLv1.0.html.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * https://jaxp.dev.java.net/CDDLv1.0.html
 * If applicable add the following below this CDDL HEADER
 * with the fields enclosed by brackets "[]" replaced with
 * your own identifying information: Portions Copyright
 * [year] [name of copyright owner]
 */

/*
 * $Id: DocumentBuilderFactory.java,v 1.6 2006/05/19 01:08:43 jeffsuttor Exp $
 * %W% %E%
 *
 * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
 */

package javax.xml.parsers;

import javax.xml.validation.Schema;

/**
 * Defines a factory API that enables applications to obtain a
 * parser that produces DOM object trees from XML documents.
 *
 * @author Jeff Suttor
 * @author Neeraj Bajaj
 *
 * @version $Revision: 1.7 $, $Date: 2007/26/04 20:34:00 $
 * Modified 26/04/2007 - Quentin Anciaux
 */

public abstract class DocumentBuilderFactory {
        
    /** The default property name according to the JAXP spec */
    private static final String DEFAULT_PROPERTY_NAME = "javax.xml.parsers.DocumentBuilderFactory";

    private boolean validating = false;
    private boolean namespaceAware = false;
    private boolean whitespace = false;
    private boolean expandEntityRef = true;
    private boolean ignoreComments = false;
    private boolean coalescing = false;
    
    private boolean canonicalState = false;
    
    /**
     * 
Protected constructor to prevent instantiation.
     * Use {@link #newInstance()}.

     */
    protected DocumentBuilderFactory () {
    }

    /**
     * Obtain a new instance of a
     * DocumentBuilderFactory. This static method creates
     * a new factory instance.
     * This method uses the following ordered lookup procedure to determine
     * the DocumentBuilderFactory implementation class to
     * load:
     * 
    
     * 
  • 
     * Use the javax.xml.parsers.DocumentBuilderFactory system
     * property.
     * 
    • 
     * 
  • 
     * Use the properties file "lib/jaxp.properties" in the JRE directory.
     * This configuration file is in standard java.util.Properties
     *  format and contains the fully qualified name of the
     * implementation class with the key being the system property defined
     * above.
     * 
     * The jaxp.properties file is read only once by the JAXP implementation
     * and it's values are then cached for future use.  If the file does not exist
     * when the first attempt is made to read from it, no further attempts are
     * made to check for its existence.  It is not possible to change the value
     * of any property in jaxp.properties after it has been read for the first time.
     * 
    • 
     * 
  • 
     * Use the Services API (as detailed in the JAR specification), if
     * available, to determine the classname. The Services API will look
     * for a classname in the file
     * META-INF/services/javax.xml.parsers.DocumentBuilderFactory
     * in jars available to the runtime.
     * 
    • 
     * 
  • 
     * Platform default DocumentBuilderFactory instance.
     * 
    • 
     * 

     *
     * Once an application has obtained a reference to a
     * DocumentBuilderFactory it can use the factory to
     * configure and obtain parser instances.
     * 
     * 
     * 
Tip for Trouble-shooting

     * 
Setting the jaxp.debug system property will cause
     * this method to print a lot of debug messages
     * to System.err about what it is doing and where it is looking at.

     * 
     * 
 If you have problems loading {@link DocumentBuilder}s, try:

     * 
     * java -Djaxp.debug=1 YourProgram ....
     * 

     * 
     * @return New instance of a DocumentBuilderFactory
     *
     * @throws FactoryConfigurationError if the implementation is not
     *   available or cannot be instantiated.
     */
    public static DocumentBuilderFactory newInstance() {
        try {
            return (DocumentBuilderFactory) FactoryFinder.find(
                /* The default property name according to the JAXP spec */
                "javax.xml.parsers.DocumentBuilderFactory",
                /* The fallback implementation class name */
                /* Modification to call Shani XML parser document
                 * builder factory - Quentin Anciaux - 26/04/2007 */
                "org.allcolor.xml.parser.CDocumentBuilderFactory");
        } catch (FactoryFinder.ConfigurationError e) {
            throw new FactoryConfigurationError(e.getException(),
                                                e.getMessage());
        }

    }

    /**
     * 
Obtain a new instance of a DocumentBuilderFactory from class name.
     * This function is useful when there are multiple providers in the classpath.
     * It gives more control to the application as it can specify which provider
     * should be loaded.

     *
     * 
Once an application has obtained a reference to a DocumentBuilderFactory 
     * it can use the factory to configure and obtain parser instances.

     * 
     * 
     * 
Tip for Trouble-shooting

     * 
Setting the jaxp.debug system property will cause
     * this method to print a lot of debug messages
     * to System.err about what it is doing and where it is looking at.

     * 
     * 
 If you have problems try:

     * 
     * java -Djaxp.debug=1 YourProgram ....
     * 

     * 
     * @param factoryClassName fully qualified factory class name that provides implementation of javax.xml.parsers.DocumentBuilderFactory.
     *
     * @param classLoader ClassLoader used to load the factory class. If null  
     *                     current Thread's context classLoader is used to load the factory class.
     *
     * @return New instance of a DocumentBuilderFactory
     *
     * @throws FactoryConfigurationError if factoryClassName is null, or 
     *                                   the factory class cannot be loaded, instantiated. 
     *
     * @see #newInstance()
     *
     * @since 1.6
     */
    public static DocumentBuilderFactory newInstance(String factoryClassName, ClassLoader classLoader){
        try {
            //do not fallback if given classloader can't find the class, throw exception
            return (DocumentBuilderFactory) FactoryFinder.newInstance(factoryClassName, classLoader, false);
        } catch (FactoryFinder.ConfigurationError e) {
            throw new FactoryConfigurationError(e.getException(),
                                                e.getMessage());
        }        
    }

    /**
     * Creates a new instance of a {@link javax.xml.parsers.DocumentBuilder}
     * using the currently configured parameters.
     *
     * @return A new instance of a DocumentBuilder.
     *
     * @throws ParserConfigurationException if a DocumentBuilder
     *   cannot be created which satisfies the configuration requested.
     */
    
    public abstract DocumentBuilder newDocumentBuilder()
        throws ParserConfigurationException;
    
    
    /**
     * Specifies that the parser produced by this code will
     * provide support for XML namespaces. By default the value of this is set
     * to false
     *
     * @param awareness true if the parser produced will provide support
     *                  for XML namespaces; false otherwise.
     */
    
    public void setNamespaceAware(boolean awareness) {
        this.namespaceAware = awareness;
    }

    /**
     * Specifies that the parser produced by this code will
     * validate documents as they are parsed. By default the value of this
     * is set to false.
     * 
     * 

     * Note that "the validation" here means
     * a validating
     * parser as defined in the XML recommendation.
     * In other words, it essentially just controls the DTD validation.
     * (except the legacy two properties defined in JAXP 1.2.)
     * 

     * 
     * 

     * To use modern schema languages such as W3C XML Schema or
     * RELAX NG instead of DTD, you can configure your parser to be
     * a non-validating parser by leaving the {@link #setValidating(boolean)}
     * method false, then use the {@link #setSchema(Schema)}
     * method to associate a schema to a parser.
     * 

     * 
     * @param validating true if the parser produced will validate documents
     *                   as they are parsed; false otherwise.
     */
    
    public void setValidating(boolean validating) {
        this.validating = validating;
    }

    /**
     * Specifies that the parsers created by this  factory must eliminate
     * whitespace in element content (sometimes known loosely as
     * 'ignorable whitespace') when parsing XML documents (see XML Rec
     * 2.10). Note that only whitespace which is directly contained within
     * element content that has an element only content model (see XML
     * Rec 3.2.1) will be eliminated. Due to reliance on the content model
     * this setting requires the parser to be in validating mode. By default
     * the value of this is set to false.
     *
     * @param whitespace true if the parser created must eliminate whitespace
     *                   in the element content when parsing XML documents;
     *                   false otherwise.
     */

    public void setIgnoringElementContentWhitespace(boolean whitespace) {
        this.whitespace = whitespace;
    }

    /**
     * Specifies that the parser produced by this code will
     * expand entity reference nodes. By default the value of this is set to
     * true
     *
     * @param expandEntityRef true if the parser produced will expand entity
     *                        reference nodes; false otherwise.
     */
    
    public void setExpandEntityReferences(boolean expandEntityRef) {
        this.expandEntityRef = expandEntityRef;
    }

    /**
     * 
Specifies that the parser produced by this code will
     * ignore comments. By default the value of this is set to false
     * .

     * 
     * @param ignoreComments boolean value to ignore comments during processing
     */
    
    public void setIgnoringComments(boolean ignoreComments) {
        this.ignoreComments = ignoreComments;
    }

    /**
     * Specifies that the parser produced by this code will
     * convert CDATA nodes to Text nodes and append it to the
     * adjacent (if any) text node. By default the value of this is set to
     * false
     *
     * @param coalescing  true if the parser produced will convert CDATA nodes
     *                    to Text nodes and append it to the adjacent (if any)
     *                    text node; false otherwise.
     */
    
    public void setCoalescing(boolean coalescing) {
        this.coalescing = coalescing;
    }

    /**
     * Indicates whether or not the factory is configured to produce
     * parsers which are namespace aware.
     *
     * @return  true if the factory is configured to produce parsers which
     *          are namespace aware; false otherwise.
     */
    
    public boolean isNamespaceAware() {
        return namespaceAware;
    }

    /**
     * Indicates whether or not the factory is configured to produce
     * parsers which validate the XML content during parse.
     *
     * @return  true if the factory is configured to produce parsers
     *          which validate the XML content during parse; false otherwise.
     */
    
    public boolean isValidating() {
        return validating;
    }

    /**
     * Indicates whether or not the factory is configured to produce
     * parsers which ignore ignorable whitespace in element content.
     *
     * @return  true if the factory is configured to produce parsers
     *          which ignore ignorable whitespace in element content;
     *          false otherwise.
     */
    
    public boolean isIgnoringElementContentWhitespace() {
        return whitespace;
    }

    /**
     * Indicates whether or not the factory is configured to produce
     * parsers which expand entity reference nodes.
     *
     * @return  true if the factory is configured to produce parsers
     *          which expand entity reference nodes; false otherwise.
     */
    
    public boolean isExpandEntityReferences() {
        return expandEntityRef;
    }

    /**
     * Indicates whether or not the factory is configured to produce
     * parsers which ignores comments.
     *
     * @return  true if the factory is configured to produce parsers
     *          which ignores comments; false otherwise.
     */
    
    public boolean isIgnoringComments() {
        return ignoreComments;
    }

    /**
     * Indicates whether or not the factory is configured to produce
     * parsers which converts CDATA nodes to Text nodes and appends it to
     * the adjacent (if any) Text node.
     *
     * @return  true if the factory is configured to produce parsers
     *          which converts CDATA nodes to Text nodes and appends it to
     *          the adjacent (if any) Text node; false otherwise.
     */
    
    public boolean isCoalescing() {
        return coalescing;
    }

    /**
     * Allows the user to set specific attributes on the underlying
     * implementation.
     *
     * @param name The name of the attribute.
     * @param value The value of the attribute.
     *
     * @throws IllegalArgumentException thrown if the underlying
     *   implementation doesn't recognize the attribute.
     */
    public abstract void setAttribute(String name, Object value)
                throws IllegalArgumentException;

    /**
     * Allows the user to retrieve specific attributes on the underlying
     * implementation.
     *
     * @param name The name of the attribute.
     *
     * @return value The value of the attribute.
     *
     * @throws IllegalArgumentException thrown if the underlying
     *   implementation doesn't recognize the attribute.
     */
    public abstract Object getAttribute(String name)
                throws IllegalArgumentException;
                
	/**
	 * 
Set a feature for this DocumentBuilderFactory and DocumentBuilders created by this factory.

	 * 
	 * 

	 * Feature names are fully qualified {@link java.net.URI}s.
	 * Implementations may define their own features.
	 * A {@link ParserConfigurationException} is thrown if this DocumentBuilderFactory or the
	 * DocumentBuilders it creates cannot support the feature.
	 * It is possible for a DocumentBuilderFactory to expose a feature value but be unable to change its state.
	 * 

	 * 
	 * 

	 * All implementations are required to support the {@link javax.xml.XMLConstants#FEATURE_SECURE_PROCESSING} feature.
	 * When the feature is:

	 * 
    
	 *   
  • 
	 *     true: the implementation will limit XML processing to conform to implementation limits.
	 *     Examples include enity expansion limits and XML Schema constructs that would consume large amounts of resources.
	 *     If XML processing is limited for security reasons, it will be reported via a call to the registered
	 *    {@link org.xml.sax.ErrorHandler#fatalError(SAXParseException exception)}.
	 *     See {@link  DocumentBuilder#setErrorHandler(org.xml.sax.ErrorHandler errorHandler)}.
	 *   
    • 
	 *   
  • 
	 *     false: the implementation will processing XML according to the XML specifications without
	 *     regard to possible implementation limits.
	 *   
    • 
	 * 

	 * 
	 * @param name Feature name.
	 * @param value Is feature state true or false.
	 *  
	 * @throws ParserConfigurationException if this DocumentBuilderFactory or the DocumentBuilders
	 *   it creates cannot support this feature.
     * @throws NullPointerException If the name parameter is null.
	 */
	public abstract void setFeature(String name, boolean value)
		throws ParserConfigurationException;

	/**
	 * 
Get the state of the named feature.

	 * 
	 * 

	 * Feature names are fully qualified {@link java.net.URI}s.
	 * Implementations may define their own features.
	 * An {@link ParserConfigurationException} is thrown if this DocumentBuilderFactory or the
	 * DocumentBuilders it creates cannot support the feature.
	 * It is possible for an DocumentBuilderFactory to expose a feature value but be unable to change its state.
	 * 

	 * 
	 * @param name Feature name.
	 * 
	 * @return State of the named feature.
	 * 
	 * @throws ParserConfigurationException if this DocumentBuilderFactory
	 *   or the DocumentBuilders it creates cannot support this feature.
	 */
	public abstract boolean getFeature(String name)
		throws ParserConfigurationException;
                
    
    /** 
Get current state of canonicalization.

     *
     * @return current state canonicalization control
     */
    /*
    public boolean getCanonicalization() {
        return canonicalState;
    }
    */
    
    
    /**
     * Gets the {@link Schema} object specified through
     * the {@link #setSchema(Schema schema)} method.
     *
     * @return
     *      the {@link Schema} object that was last set through
     *      the {@link #setSchema(Schema)} method, or null
     *      if the method was not invoked since a {@link DocumentBuilderFactory}
     *      is created.
     *
     * @throws UnsupportedOperationException When implementation does not
     *   override this method.
     *
     * @since 1.5
     */
    public Schema getSchema() {
        throw new UnsupportedOperationException(
            "This parser does not support specification \""
            + this.getClass().getPackage().getSpecificationTitle()
            + "\" version \""
            + this.getClass().getPackage().getSpecificationVersion()
            + "\""
            );

    }
    
    /* 
Set canonicalization control to true or
     * false.

     *
     * @param state of canonicalization
     */
    /*
    public void setCanonicalization(boolean state) {
        canonicalState = state;
    }
    */
    
    /**
     * 
Set the {@link Schema} to be used by parsers created
     * from this factory.
     * 
     * 

     * When a {@link Schema} is non-null, a parser will use a validator
     * created from it to validate documents before it passes information
     * down to the application.
     * 
     * 
When errors are found by the validator, the parser is responsible
     * to report them to the user-specified {@link org.xml.sax.ErrorHandler}
     * (or if the error handler is not set, ignore them or throw them), just
     * like any other errors found by the parser itself.
     * In other words, if the user-specified {@link org.xml.sax.ErrorHandler}
     * is set, it must receive those errors, and if not, they must be
     * treated according to the implementation specific
     * default error handling rules.
     * 
     * 

     * A validator may modify the outcome of a parse (for example by
     * adding default values that were missing in documents), and a parser
     * is responsible to make sure that the application will receive
     * modified DOM trees.  
     * 
     * 

     * Initialy, null is set as the {@link Schema}. 
     * 
     * 

     * This processing will take effect even if
     * the {@link #isValidating()} method returns false.
     * 
     * 
It is an error to use
     * the http://java.sun.com/xml/jaxp/properties/schemaSource
     * property and/or the http://java.sun.com/xml/jaxp/properties/schemaLanguage
     * property in conjunction with a {@link Schema} object.
     * Such configuration will cause a {@link ParserConfigurationException}
     * exception when the {@link #newDocumentBuilder()} is invoked.

     *
     *  
     * 
Note for implmentors

     *
     * 

     * A parser must be able to work with any {@link Schema}
     * implementation. However, parsers and schemas are allowed
     * to use implementation-specific custom mechanisms
     * as long as they yield the result described in the specification.
     * 

     *
     * @param schema Schema to use or null
     *   to remove a schema.
     *
     * @throws UnsupportedOperationException When implementation does not
     *   override this method.
     *
     * @since 1.5
     */
    public void setSchema(Schema schema) {
        throw new UnsupportedOperationException(
            "This parser does not support specification \""
            + this.getClass().getPackage().getSpecificationTitle()
            + "\" version \""
            + this.getClass().getPackage().getSpecificationVersion()
            + "\""
            );
    }
    

    
    /**
     * 
Set state of XInclude processing.

     * 
     * 
If XInclude markup is found in the document instance, should it be
     * processed as specified in 
     * XML Inclusions (XInclude) Version 1.0.

     * 
     * 
XInclude processing defaults to false.

     * 
     * @param state Set XInclude processing to true or
     *   false
     *
     * @throws UnsupportedOperationException When implementation does not
     *   override this method.
     *
     * @since 1.5
     */
    public void setXIncludeAware(final boolean state) {
        throw new UnsupportedOperationException(
            "This parser does not support specification \""
            + this.getClass().getPackage().getSpecificationTitle()
            + "\" version \""
            + this.getClass().getPackage().getSpecificationVersion()
            + "\""
            );
    }

    /**
     * 
Get state of XInclude processing.

     * 
     * @return current state of XInclude processing
     *
     * @throws UnsupportedOperationException When implementation does not
     *   override this method.
     *
     * @since 1.5
     */
    public boolean isXIncludeAware() {
        throw new UnsupportedOperationException(
            "This parser does not support specification \""
            + this.getClass().getPackage().getSpecificationTitle()
            + "\" version \""
            + this.getClass().getPackage().getSpecificationVersion()
            + "\""
            );
    }
}




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