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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 * accompanied this code).

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package javax.xml.stream;

import com.sun.xml.internal.stream.events.XMLEventFactoryImpl;

import java.util.Iterator;

import javax.xml.namespace.NamespaceContext;

import javax.xml.namespace.QName;

import javax.xml.stream.events.*;

/**

 * This interface defines a utility class for creating instances of

 * XMLEvents

 * @version 1.2

 * @author Copyright (c) 2009 by Oracle Corporation. All Rights Reserved.

 * @see javax.xml.stream.events.StartElement

 * @see javax.xml.stream.events.EndElement

 * @see javax.xml.stream.events.ProcessingInstruction

 * @see javax.xml.stream.events.Comment

 * @see javax.xml.stream.events.Characters

 * @see javax.xml.stream.events.StartDocument

 * @see javax.xml.stream.events.EndDocument

 * @see javax.xml.stream.events.DTD

 * @since 1.6

 */

public abstract class XMLEventFactory {

  protected XMLEventFactory(){}

    static final String JAXPFACTORYID = "javax.xml.stream.XMLEventFactory";

    static final String DEFAULIMPL = "com.sun.xml.internal.stream.events.XMLEventFactoryImpl";

   /**

   * Creates a new instance of the {@code XMLEventFactory} builtin

   * system-default implementation.

   *

   * @return A new instance of the {@code XMLEventFactory} builtin

   *         system-default implementation.

   *

   * @since 9

   */

  public static XMLEventFactory newDefaultFactory() {

      return new XMLEventFactoryImpl();

  }

  /**

   * Creates a new instance of the factory in exactly the same manner as the

   * {@link #newFactory()} method.

   * @throws FactoryConfigurationError if an instance of this factory cannot be loaded

   */

  public static XMLEventFactory newInstance()

    throws FactoryConfigurationError

  {

    return FactoryFinder.find(XMLEventFactory.class, DEFAULIMPL);

  }

  /**

   * Create a new instance of the factory.

   * <p>

   * This static method creates a new factory instance.

   * This method uses the following ordered lookup procedure to determine

   * the XMLEventFactory implementation class to load:

   * <ul>

   * <li>

   *   Use the javax.xml.stream.XMLEventFactory system property.

   * </li>

   * <li>

   *   <p>

   *   Use the configuration file "stax.properties". The file is in standard

   *   {@link java.util.Properties} format and typically located in the

   *   {@code conf} directory of the Java installation. It contains the fully qualified

   *   name of the implementation class with the key being the system property

   *   defined above.

   *

   *   <p>

   *   The stax.properties file is read only once by the implementation

   *   and its 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 stax.properties after it has been read for the first time.

   *

   *   <p>

   *   Use the jaxp configuration file "jaxp.properties". The file is in the same

   *   format as stax.properties and will only be read if stax.properties does

   *   not exist.

   * </li>

   * <li>

   *   <p>

   *   Use the service-provider loading facility, defined by the

   *   {@link java.util.ServiceLoader} class, to attempt to locate and load an

   *   implementation of the service using the {@linkplain

   *   java.util.ServiceLoader#load(java.lang.Class) default loading mechanism}:

   *   the service-provider loading facility will use the {@linkplain

   *   java.lang.Thread#getContextClassLoader() current thread's context class loader}

   *   to attempt to load the service. If the context class

   *   loader is null, the {@linkplain

   *   ClassLoader#getSystemClassLoader() system class loader} will be used.

   * </li>

   * <li>

   *   <p>

   *   Otherwise, the {@linkplain #newDefaultFactory() system-default}

   *   implementation is returned.

   * </li>

   * </ul>

   * <p>

   *   Once an application has obtained a reference to a XMLEventFactory it

   *   can use the factory to configure and obtain stream instances.

   *

   * @throws FactoryConfigurationError in case of {@linkplain

   *   java.util.ServiceConfigurationError service configuration error} or if

   *   the implementation is not available or cannot be instantiated.

   */

  public static XMLEventFactory newFactory()

    throws FactoryConfigurationError

  {

    return FactoryFinder.find(XMLEventFactory.class, DEFAULIMPL);

  }

  /**

   * Create a new instance of the factory

   *

   * @param factoryId             Name of the factory to find, same as

   *                              a property name

   * @param classLoader           classLoader to use

   * @return the factory implementation

   * @throws FactoryConfigurationError if an instance of this factory cannot be loaded

   *

   * @deprecated  This method has been deprecated to maintain API consistency.

   *              All newInstance methods have been replaced with corresponding

   *              newFactory methods. The replacement {@link

   *              #newFactory(java.lang.String, java.lang.ClassLoader)}

   *              method defines no changes in behavior.

   */

  @Deprecated(since="1.7")

  public static XMLEventFactory newInstance(String factoryId,

          ClassLoader classLoader)

          throws FactoryConfigurationError {

      //do not fallback if given classloader can't find the class, throw exception

      return FactoryFinder.find(XMLEventFactory.class, factoryId, classLoader, null);

  }

  /**

   * Create a new instance of the factory.

   * If the classLoader argument is null, then the ContextClassLoader is used.

   * <p>

   * This method uses the following ordered lookup procedure to determine

   * the XMLEventFactory implementation class to load:

   * <ul>

   * <li>

   *   Use the value of the system property identified by {@code factoryId}.

   * </li>

   * <li>

   *   <p>

   *   Use the configuration file "stax.properties". The file is in standard

   *   {@link java.util.Properties} format and typically located in the

   *   conf directory of the Java installation. It contains the fully qualified

   *   name of the implementation class with the key being the system property

   *   defined above.

   *

   *   <p>

   *   The stax.properties file is read only once by the implementation

   *   and its 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 stax.properties after it has been read for the first time.

   *

   *   <p>

   *   Use the jaxp configuration file "jaxp.properties". The file is in the same

   *   format as stax.properties and will only be read if stax.properties does

   *   not exist.

   * </li>

   * <li>

   *   <p>

   *   If {@code factoryId} is "javax.xml.stream.XMLEventFactory",

   *   use the service-provider loading facility, defined by the

   *   {@link java.util.ServiceLoader} class, to attempt to {@linkplain

   *   java.util.ServiceLoader#load(java.lang.Class, java.lang.ClassLoader) locate and load}

   *   an implementation of the service using the specified {@code ClassLoader}.

   *   If {@code classLoader} is null, the {@linkplain

   *   java.util.ServiceLoader#load(java.lang.Class) default loading mechanism} will apply:

   *   That is, the service-provider loading facility will use the {@linkplain

   *   java.lang.Thread#getContextClassLoader() current thread's context class loader}

   *   to attempt to load the service. If the context class

   *   loader is null, the {@linkplain

   *   ClassLoader#getSystemClassLoader() system class loader} will be used.

   * </li>

   * <li>

   *   <p>

   *   Otherwise, throws a {@link FactoryConfigurationError}.

   * </li>

   * </ul>

   *

   * <p>

   * Note that this is a new method that replaces the deprecated

   *   {@link #newInstance(java.lang.String, java.lang.ClassLoader)

   *   newInstance(String factoryId, ClassLoader classLoader)} method.

   * No changes in behavior are defined by this replacement method relative

   * to the deprecated method.

   *

   * @apiNote The parameter factoryId defined here is inconsistent with that

   * of other JAXP factories where the first parameter is fully qualified

   * factory class name that provides implementation of the factory.

   *

   * @param factoryId             Name of the factory to find, same as

   *                              a property name

   * @param classLoader           classLoader to use

   * @return the factory implementation

   * @throws FactoryConfigurationError in case of {@linkplain

   *   java.util.ServiceConfigurationError service configuration error} or if

   *   the implementation is not available or cannot be instantiated.

   */

  public static XMLEventFactory newFactory(String factoryId,

                                           ClassLoader classLoader)

          throws FactoryConfigurationError {

      //do not fallback if given classloader can't find the class, throw exception

      return FactoryFinder.find(XMLEventFactory.class, factoryId, classLoader, null);

  }

 /**

   * This method allows setting of the Location on each event that

   * is created by this factory.  The values are copied by value into

   * the events created by this factory.  To reset the location

   * information set the location to null.

   * @param location the location to set on each event created

   */

  public abstract void setLocation(Location location);

  /**

   * Create a new Attribute

   * @param prefix the prefix of this attribute, may not be null

   * @param namespaceURI the attribute value is set to this value, may not be null

   * @param localName the local name of the XML name of the attribute, localName cannot be null

   * @param value the attribute value to set, may not be null

   * @return the Attribute with specified values

   */

  public abstract Attribute createAttribute(String prefix, String namespaceURI, String localName, String value);

  /**

   * Create a new Attribute

   * @param localName the local name of the XML name of the attribute, localName cannot be null

   * @param value the attribute value to set, may not be null

   * @return the Attribute with specified values

   */

  public abstract Attribute createAttribute(String localName, String value);

  /**

   * Create a new Attribute

   * @param name the qualified name of the attribute, may not be null

   * @param value the attribute value to set, may not be null

   * @return the Attribute with specified values

   */

  public abstract Attribute createAttribute(QName name, String value);

  /**

   * Create a new default Namespace

   * @param namespaceURI the default namespace uri

   * @return the Namespace with the specified value

   */

  public abstract Namespace createNamespace(String namespaceURI);

  /**

   * Create a new Namespace

   * @param prefix the prefix of this namespace, may not be null

   * @param namespaceUri the attribute value is set to this value, may not be null

   * @return the Namespace with the specified values

   */

  public abstract Namespace createNamespace(String prefix, String namespaceUri);

  /**

   * Create a new StartElement.  Namespaces can be added to this StartElement

   * by passing in an Iterator that walks over a set of Namespace interfaces.

   * Attributes can be added to this StartElement by passing an iterator

   * that walks over a set of Attribute interfaces.

   *

   * @param name the qualified name of the attribute, may not be null

   * @param attributes an optional unordered set of objects that

   * implement Attribute to add to the new StartElement, may be null

   * @param namespaces an optional unordered set of objects that

   * implement Namespace to add to the new StartElement, may be null

   * @return an instance of the requested StartElement

   */

  public abstract StartElement createStartElement(QName name,

                                                  Iterator<? extends Attribute> attributes,

                                                  Iterator<? extends Namespace> namespaces);

  /**

   * Create a new StartElement.  This defaults the NamespaceContext to

   * an empty NamespaceContext.  Querying this event for its namespaces or

   * attributes will result in an empty iterator being returned.

   *

   * @param namespaceUri the uri of the QName of the new StartElement

   * @param localName the local name of the QName of the new StartElement

   * @param prefix the prefix of the QName of the new StartElement

   * @return an instance of the requested StartElement

   */

  public abstract StartElement createStartElement(String prefix,

                                                  String namespaceUri,

                                                  String localName);

  /**

   * Create a new StartElement.  Namespaces can be added to this StartElement

   * by passing in an Iterator that walks over a set of Namespace interfaces.

   * Attributes can be added to this StartElement by passing an iterator

   * that walks over a set of Attribute interfaces.

   *

   * @param namespaceUri the uri of the QName of the new StartElement

   * @param localName the local name of the QName of the new StartElement

   * @param prefix the prefix of the QName of the new StartElement

   * @param attributes an unordered set of objects that implement

   * Attribute to add to the new StartElement

   * @param namespaces an unordered set of objects that implement

   * Namespace to add to the new StartElement

   * @return an instance of the requested StartElement

   */

  public abstract StartElement createStartElement(String prefix,

                                                  String namespaceUri,

                                                  String localName,

                                                  Iterator<? extends Attribute> attributes,

                                                  Iterator<? extends Namespace> namespaces

                                                  );

  /**

   * Create a new StartElement.  Namespaces can be added to this StartElement

   * by passing in an Iterator that walks over a set of Namespace interfaces.

   * Attributes can be added to this StartElement by passing an iterator

   * that walks over a set of Attribute interfaces.

   *

   * @param namespaceUri the uri of the QName of the new StartElement

   * @param localName the local name of the QName of the new StartElement

   * @param prefix the prefix of the QName of the new StartElement

   * @param attributes an unordered set of objects that implement

   * Attribute to add to the new StartElement, may be null

   * @param namespaces an unordered set of objects that implement

   * Namespace to add to the new StartElement, may be null

   * @param context the namespace context of this element

   * @return an instance of the requested StartElement

   */

  public abstract StartElement createStartElement(String prefix,

                                                  String namespaceUri,

                                                  String localName,

                                                  Iterator<? extends Attribute> attributes,

                                                  Iterator<? extends Namespace> namespaces,

                                                  NamespaceContext context

                                                  );

  /**

   * Create a new EndElement

   * @param name the qualified name of the EndElement

   * @param namespaces an optional unordered set of objects that

   * implement Namespace that have gone out of scope, may be null

   * @return an instance of the requested EndElement

   */

  public abstract EndElement createEndElement(QName name,

                                              Iterator<? extends Namespace> namespaces);

  /**

   * Create a new EndElement

   * @param namespaceUri the uri of the QName of the new StartElement

   * @param localName the local name of the QName of the new StartElement

   * @param prefix the prefix of the QName of the new StartElement

   * @return an instance of the requested EndElement

   */

  public abstract EndElement createEndElement(String prefix,

                                              String namespaceUri,

                                              String localName);

  /**

   * Create a new EndElement

   * @param namespaceUri the uri of the QName of the new StartElement

   * @param localName the local name of the QName of the new StartElement

   * @param prefix the prefix of the QName of the new StartElement

   * @param namespaces an unordered set of objects that implement

   * Namespace that have gone out of scope, may be null

   * @return an instance of the requested EndElement

   */

  public abstract EndElement createEndElement(String prefix,

                                              String namespaceUri,

                                              String localName,

                                              Iterator<? extends Namespace> namespaces);

  /**

   * Create a Characters event, this method does not check if the content

   * is all whitespace.  To create a space event use #createSpace(String)

   * @param content the string to create

   * @return a Characters event

   */

  public abstract Characters createCharacters(String content);

  /**

   * Create a Characters event with the CData flag set to true

   * @param content the string to create

   * @return a Characters event

   */

  public abstract Characters createCData(String content);

  /**

   * Create a Characters event with the isSpace flag set to true

   * @param content the content of the space to create

   * @return a Characters event

   */

  public abstract Characters createSpace(String content);

  /**

   * Create an ignorable space

   * @param content the space to create

   * @return a Characters event

   */

  public abstract Characters createIgnorableSpace(String content);

  /**

   * Creates a new instance of a StartDocument event

   * @return a StartDocument event

   */

  public abstract StartDocument createStartDocument();

  /**

   * Creates a new instance of a StartDocument event

   *

   * @param encoding the encoding style

   * @param version the XML version

   * @param standalone the status of standalone may be set to "true" or "false"

   * @return a StartDocument event

   */

  public abstract StartDocument createStartDocument(String encoding,

                                                  String version,

                                                  boolean standalone);

  /**

   * Creates a new instance of a StartDocument event

   *

   * @param encoding the encoding style

   * @param version the XML version

   * @return a StartDocument event

   */

  public abstract StartDocument createStartDocument(String encoding,

                                                  String version);

  /**

   * Creates a new instance of a StartDocument event

   *

   * @param encoding the encoding style

   * @return a StartDocument event

   */

  public abstract StartDocument createStartDocument(String encoding);

  /**

   * Creates a new instance of an EndDocument event

   * @return an EndDocument event

   */

  public abstract EndDocument createEndDocument();

  /** Creates a new instance of a EntityReference event

   *

   * @param name The name of the reference

   * @param declaration the declaration for the event

   * @return an EntityReference event

   */

  public abstract EntityReference createEntityReference(String name,

                                                        EntityDeclaration declaration);

  /**

   * Create a comment

   * @param text The text of the comment

   * a Comment event

   */

  public abstract Comment createComment(String text);

  /**

   * Create a processing instruction

   * @param target The target of the processing instruction

   * @param data The text of the processing instruction

   * @return a ProcessingInstruction event

   */

  public abstract ProcessingInstruction createProcessingInstruction(String target,

                                                                   String data);

  /**

   * Create a document type definition event

   * This string contains the entire document type declaration that matches

   * the doctypedecl in the XML 1.0 specification

   * @param dtd the text of the document type definition

   * @return a DTD event

   */

  public abstract DTD createDTD(String dtd);

}