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package javax.xml.stream;

import com.sun.xml.internal.stream.XMLInputFactoryImpl;

import javax.xml.stream.util.XMLEventAllocator;

import javax.xml.transform.Source;

/**

 * Defines an abstract implementation of a factory for getting streams.

 *

 * The following table defines the standard properties of this specification.

 * Each property varies in the level of support required by each implementation.

 * The level of support required is described in the 'Required' column.

 *

 *    <thead>

 *      <tr>

 *        <th>Property Name</th>

 *        <th>Behavior</th>

 *        <th>Return type</th>

 *        <th>Default Value</th>

 *        <th>Required</th>

 *      </tr>

 * <tr><td>javax.xml.stream.isValidating</td><td>Turns on/off implementation specific DTD validation</td><td>Boolean</td><td>False</td><td>No</td></tr>

 * <tr><td>javax.xml.stream.isNamespaceAware</td><td>Turns on/off namespace processing for XML 1.0 support</td><td>Boolean</td><td>True</td><td>True (required) / False (optional)</td></tr>

 * <tr><td>javax.xml.stream.isCoalescing</td><td>Requires the processor to coalesce adjacent character data</td><td>Boolean</td><td>False</td><td>Yes</td></tr>

 * <tr><td>javax.xml.stream.isReplacingEntityReferences</td><td>replace internal entity references with their replacement text and report them as characters</td><td>Boolean</td><td>True</td><td>Yes</td></tr>

 *<tr><td>javax.xml.stream.isSupportingExternalEntities</td><td>Resolve external parsed entities</td><td>Boolean</td><td>Unspecified</td><td>Yes</td></tr>

 *<tr><td>javax.xml.stream.supportDTD</td><td>Use this property to request processors that do not support DTDs</td><td>Boolean</td><td>True</td><td>Yes</td></tr>

 *<tr><td>javax.xml.stream.reporter</td><td>sets/gets the impl of the XMLReporter </td><td>javax.xml.stream.XMLReporter</td><td>Null</td><td>Yes</td></tr>

 *<tr><td>javax.xml.stream.resolver</td><td>sets/gets the impl of the XMLResolver interface</td><td>javax.xml.stream.XMLResolver</td><td>Null</td><td>Yes</td></tr>

 *<tr><td>javax.xml.stream.allocator</td><td>sets/gets the impl of the XMLEventAllocator interface</td><td>javax.xml.stream.util.XMLEventAllocator</td><td>Null</td><td>Yes</td></tr>

 *    </tbody>

 *  </table>

 *

 *

 * @version 1.2

 * @author Copyright (c) 2009, 2015 by Oracle Corporation. All Rights Reserved.

 * @see XMLOutputFactory

 * @see XMLEventReader

 * @see XMLStreamReader

 * @see EventFilter

 * @see XMLReporter

 * @see XMLResolver

 * @see javax.xml.stream.util.XMLEventAllocator

 * @since 1.6

 */

public abstract class XMLInputFactory {

  /**

   * The property used to turn on/off namespace support,

   * this is to support XML 1.0 documents,

   * only the true setting must be supported

   */

  public static final String IS_NAMESPACE_AWARE=

    "javax.xml.stream.isNamespaceAware";

  /**

   * The property used to turn on/off implementation specific validation

   */

  public static final String IS_VALIDATING=

    "javax.xml.stream.isValidating";

  /**

   * The property that requires the parser to coalesce adjacent character data sections

   */

  public static final String IS_COALESCING=

    "javax.xml.stream.isCoalescing";

  /**

   * Requires the parser to replace internal

   * entity references with their replacement

   * text and report them as characters

   */

  public static final String IS_REPLACING_ENTITY_REFERENCES=

    "javax.xml.stream.isReplacingEntityReferences";

  /**

   *  The property that requires the parser to resolve external parsed entities

   */

  public static final String IS_SUPPORTING_EXTERNAL_ENTITIES=

    "javax.xml.stream.isSupportingExternalEntities";

  /**

   *  The property that requires the parser to support DTDs

   */

  public static final String SUPPORT_DTD=

    "javax.xml.stream.supportDTD";

  /**

   * The property used to

   * set/get the implementation of the XMLReporter interface

   */

  public static final String REPORTER=

    "javax.xml.stream.reporter";

  /**

   * The property used to set/get the implementation of the XMLResolver

   */

  public static final String RESOLVER=

    "javax.xml.stream.resolver";

  /**

   * The property used to set/get the implementation of the allocator

   */

  public static final String ALLOCATOR=

    "javax.xml.stream.allocator";

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

  protected XMLInputFactory(){}

  /**

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

   * system-default implementation.

   *

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

   *         system-default implementation.

   *

   * @since 9

   */

  public static XMLInputFactory newDefaultFactory() {

      return new XMLInputFactoryImpl();

  }

  /**

   * 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 XMLInputFactory newInstance()

    throws FactoryConfigurationError

  {

    return FactoryFinder.find(XMLInputFactory.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 XMLInputFactory implementation class to load:

   *

   * <ul>

   * <li>

   *   <p>Use the javax.xml.stream.XMLInputFactory 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 XMLInputFactory it

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

   * <p>

   *   Note that this is a new method that replaces the deprecated newInstance() method.

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

   *     the deprecated method.

   *

   * @throws FactoryConfigurationError in case of {@linkplain

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

   *   the implementation is not available or cannot be instantiated.

   */

  @Deprecated(since="1.7")

  public static XMLInputFactory newFactory()

    throws FactoryConfigurationError

  {

    return FactoryFinder.find(XMLInputFactory.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 XMLInputFactory newInstance(String factoryId,

          ClassLoader classLoader)

          throws FactoryConfigurationError {

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

      return FactoryFinder.find(XMLInputFactory.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 XMLInputFactory implementation class to load:

   * <ul>

   * <li>

   *   <p>

   *   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

   *   {@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>

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

   *   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.

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

   */

  public static XMLInputFactory newFactory(String factoryId,

          ClassLoader classLoader)

          throws FactoryConfigurationError {

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

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

  }

  /**

   * Create a new XMLStreamReader from a reader

   * @param reader the XML data to read from

   * @throws XMLStreamException

   */

  public abstract XMLStreamReader createXMLStreamReader(java.io.Reader reader)

    throws XMLStreamException;

  /**

   * Create a new XMLStreamReader from a JAXP source.  This method is optional.

   * @param source the source to read from

   * @throws UnsupportedOperationException if this method is not

   * supported by this XMLInputFactory

   * @throws XMLStreamException

   */

  public abstract XMLStreamReader createXMLStreamReader(Source source)

    throws XMLStreamException;

  /**

   * Create a new XMLStreamReader from a java.io.InputStream

   * @param stream the InputStream to read from

   * @throws XMLStreamException

   */

  public abstract XMLStreamReader createXMLStreamReader(java.io.InputStream stream)

    throws XMLStreamException;

  /**

   * Create a new XMLStreamReader from a java.io.InputStream

   * @param stream the InputStream to read from

   * @param encoding the character encoding of the stream

   * @throws XMLStreamException

   */

  public abstract XMLStreamReader createXMLStreamReader(java.io.InputStream stream, String encoding)

    throws XMLStreamException;

  /**

   * Create a new XMLStreamReader from a java.io.InputStream

   * @param systemId the system ID of the stream

   * @param stream the InputStream to read from

   */

  public abstract XMLStreamReader createXMLStreamReader(String systemId, java.io.InputStream stream)

    throws XMLStreamException;

  /**

   * Create a new XMLStreamReader from a java.io.InputStream

   * @param systemId the system ID of the stream

   * @param reader the InputStream to read from

   */

  public abstract XMLStreamReader createXMLStreamReader(String systemId, java.io.Reader reader)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from a reader

   * @param reader the XML data to read from

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createXMLEventReader(java.io.Reader reader)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from a reader

   * @param systemId the system ID of the input

   * @param reader the XML data to read from

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createXMLEventReader(String systemId, java.io.Reader reader)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from an XMLStreamReader.  After being used

   * to construct the XMLEventReader instance returned from this method

   * the XMLStreamReader must not be used.

   * @param reader the XMLStreamReader to read from (may not be modified)

   * @return a new XMLEventReader

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createXMLEventReader(XMLStreamReader reader)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from a JAXP source.

   * Support of this method is optional.

   * @param source the source to read from

   * @throws UnsupportedOperationException if this method is not

   * supported by this XMLInputFactory

   */

  public abstract XMLEventReader createXMLEventReader(Source source)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from a java.io.InputStream

   * @param stream the InputStream to read from

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createXMLEventReader(java.io.InputStream stream)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from a java.io.InputStream

   * @param stream the InputStream to read from

   * @param encoding the character encoding of the stream

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createXMLEventReader(java.io.InputStream stream, String encoding)

    throws XMLStreamException;

  /**

   * Create a new XMLEventReader from a java.io.InputStream

   * @param systemId the system ID of the stream

   * @param stream the InputStream to read from

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createXMLEventReader(String systemId, java.io.InputStream stream)

    throws XMLStreamException;

  /**

   * Create a filtered reader that wraps the filter around the reader

   * @param reader the reader to filter

   * @param filter the filter to apply to the reader

   * @throws XMLStreamException

   */

  public abstract XMLStreamReader createFilteredReader(XMLStreamReader reader, StreamFilter filter)

    throws XMLStreamException;

  /**

   * Create a filtered event reader that wraps the filter around the event reader

   * @param reader the event reader to wrap

   * @param filter the filter to apply to the event reader

   * @throws XMLStreamException

   */

  public abstract XMLEventReader createFilteredReader(XMLEventReader reader, EventFilter filter)

    throws XMLStreamException;

  /**

   * The resolver that will be set on any XMLStreamReader or XMLEventReader created

   * by this factory instance.

   */

  public abstract XMLResolver getXMLResolver();

  /**

   * The resolver that will be set on any XMLStreamReader or XMLEventReader created

   * by this factory instance.

   * @param resolver the resolver to use to resolve references

   */

  public abstract void  setXMLResolver(XMLResolver resolver);

  /**

   * The reporter that will be set on any XMLStreamReader or XMLEventReader created

   * by this factory instance.

   */

  public abstract XMLReporter getXMLReporter();

  /**

   * The reporter that will be set on any XMLStreamReader or XMLEventReader created

   * by this factory instance.

   * @param reporter the resolver to use to report non fatal errors

   */

  public abstract void setXMLReporter(XMLReporter reporter);

  /**

   * Allows the user to set specific feature/property on the underlying

   * implementation. The underlying implementation is not required to support

   * every setting of every property in the specification and may use

   * IllegalArgumentException to signal that an unsupported property may not be

   * set with the specified value.

   * <p>

   * All implementations that implement JAXP 1.5 or newer are required to

   * support the {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_DTD} property.

   * <ul>

   *   <li>

   *        <p>

   *        Access to external DTDs, external Entity References is restricted to the

   *        protocols specified by the property. If access is denied during parsing

   *        due to the restriction of this property, {@link javax.xml.stream.XMLStreamException}

   *        will be thrown by the {@link javax.xml.stream.XMLStreamReader#next()} or

   *        {@link javax.xml.stream.XMLEventReader#nextEvent()} method.

   *

   *   </li>

   * </ul>

   * @param name The name of the property (may not be null)

   * @param value The value of the property

   * @throws java.lang.IllegalArgumentException if the property is not supported

   */