/*

 * 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.

 */

/*

 * $Id: InputSource.hpp 568078 2007-08-21 11:43:25Z amassari $

 */

#ifndef INPUTSOURCE_HPP

#define INPUTSOURCE_HPP

#include <xercesc/util/PlatformUtils.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class BinInputStream;

/**

  * A single input source for an XML entity.

  *

  * <p>This class encapsulates information about an input source in a

  * single object, which may include a public identifier or a system

  * identifier</p>

  *

  * <p>There are two places that the application will deliver this input

  * source to the parser: as the argument to the Parser::parse method, or as

  * the return value of the EntityResolver::resolveEntity method.</p>

  *

  * <p>InputSource is never used directly, but is the base class for a number

  * of derived classes for particular types of input sources. Derivatives are

  * provided (in the framework/ directory) for URL input sources, memory buffer

  * input sources, and so on.</p>

  *

  * <p>When it is time to parse the input described by an input source, it

  * will be asked to create a binary stream for that source. That stream will

  * be used to input the data of the source. The derived class provides the

  * implementation of the makeStream() method, and provides a type of stream

  * of the correct type for the input source it represents.

  *

  * <p>An InputSource object belongs to the application: the parser never

  * modifies them in any way. They are always passed by const reference so

  * the parser will make a copy of any input sources that it must keep

  * around beyond the call.</p>

  *

  * @see Parser#parse

  * @see EntityResolver#resolveEntity

  */

class SAX_EXPORT InputSource : public XMemory

{

public:

    // -----------------------------------------------------------------------

    //  All constructors are hidden, just the destructor is available

    // -----------------------------------------------------------------------

    /** @name Destructor */

    //@{

  /**

    * Destructor

    *

    */

    virtual ~InputSource();

    //@}

    // -----------------------------------------------------------------------

    /** @name Virtual input source interface */

    //@{

  /**

    * Makes the byte stream for this input source.

    *

    * <p>The derived class must create and return a binary input stream of an

    * appropriate type for its kind of data source. The returned stream must

    * be dynamically allocated and becomes the parser's property.

    * </p>

    *

    * @see BinInputStream

    */

    virtual BinInputStream* makeStream() const = 0;

    //@}

    // -----------------------------------------------------------------------

    /** @name Getter methods */

    //@{

  /**

    * An input source can be set to force the parser to assume a particular

    * encoding for the data that input source reprsents, via the setEncoding()

    * method. This method returns name of the encoding that is to be forced.

    * If the encoding has never been forced, it returns a null pointer.

    *

    * @return The forced encoding, or null if none was supplied.

    * @see #setEncoding

    */

    virtual const XMLCh* getEncoding() const;

  /**

    * Get the public identifier for this input source.

    *

    * @return The public identifier, or null if none was supplied.

    * @see #setPublicId

    */

    virtual const XMLCh* getPublicId() const;

  /**

    * Get the system identifier for this input source.

    *

    * <p>If the system ID is a URL, it will be fully resolved.</p>

    *

    * @return The system identifier.

    * @see #setSystemId

    */

    virtual const XMLCh* getSystemId() const;

  /**

    * Get the flag that indicates if the parser should issue fatal error if this input source

    * is not found.

    *

    * @return True if the parser should issue fatal error if this input source is not found.

    *         False if the parser issue warning message instead.

    * @see #setIssueFatalErrorIfNotFound

    */

    virtual bool getIssueFatalErrorIfNotFound() const;

    MemoryManager* getMemoryManager() const;

    //@}

    // -----------------------------------------------------------------------

    /** @name Setter methods */

    //@{

  /**

    * Set the encoding which will be required for use with the XML text read

    * via a stream opened by this input source.

    *

    * <p>This is usually not set, allowing the encoding to be sensed in the

    * usual XML way. However, in some cases, the encoding in the file is known

    * to be incorrect because of intermediate transcoding, for instance

    * encapsulation within a MIME document.

    *

    * @param encodingStr The name of the encoding to force.

    */

    virtual void setEncoding(const XMLCh* const encodingStr);

  /**

    * Set the public identifier for this input source.

    *

    * <p>The public identifier is always optional: if the application writer

    * includes one, it will be provided as part of the location information.</p>

    *

    * @param publicId The public identifier as a string.

    * @see Locator#getPublicId

    * @see SAXParseException#getPublicId

    * @see #getPublicId

    */

    virtual void setPublicId(const XMLCh* const publicId);

  /**

    * Set the system identifier for this input source.

    *

    * <p>Set the system identifier for this input source.

    *

    * </p>The system id is always required. The public id may be used to map

    * to another system id, but the system id must always be present as a fall

    * back.

    *

    * <p>If the system ID is a URL, it must be fully resolved.</p>

    *

    * @param systemId The system identifier as a string.

    * @see #getSystemId

    * @see Locator#getSystemId

    * @see SAXParseException#getSystemId

    */

    virtual void setSystemId(const XMLCh* const systemId);

  /**

    * Indicates if the parser should issue fatal error if this input source

    * is not found.  If set to false, the parser issue warning message instead.

    *

    * @param  flag True if the parser should issue fatal error if this input source is not found.

    *               If set to false, the parser issue warning message instead.  (Default: true)

    *

    * @see #getIssueFatalErrorIfNotFound

    */

    virtual void setIssueFatalErrorIfNotFound(const bool flag);

    //@}

protected :

    // -----------------------------------------------------------------------

    //  Hidden constructors

    // -----------------------------------------------------------------------

    /** @name Constructors and Destructor */

    //@{

    /** Default constructor */

    InputSource(MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    /** Constructor with a system identifier as XMLCh type.

      * @param systemId The system identifier (URI).

      * @param manager    Pointer to the memory manager to be used to

      *                   allocate objects.

      */

    InputSource(const XMLCh* const systemId,

                MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    /** Constructor with a system and public identifiers

      * @param systemId The system identifier (URI).

      * @param publicId The public identifier as in the entity definition.

      * @param manager    Pointer to the memory manager to be used to

      *                   allocate objects.

      */

    InputSource

    (

        const   XMLCh* const   systemId

        , const XMLCh* const   publicId

        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager

    );

    /** Constructor witha system identifier as string

      * @param systemId The system identifier (URI).

      * @param manager    Pointer to the memory manager to be used to

      *                   allocate objects.

      */

    InputSource(const char* const systemId,

                MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    /** Constructor witha system and public identifiers. Both as string

      * @param systemId The system identifier (URI).

      * @param publicId The public identifier as in the entity definition.

      * @param manager    Pointer to the memory manager to be used to

      *                   allocate objects.

      */

    InputSource

    (

        const   char* const systemId

        , const char* const publicId

        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager

    );

    //@}

private:

    // -----------------------------------------------------------------------

    //  Unimplemented constructors and operators

    // -----------------------------------------------------------------------

    InputSource(const InputSource&);

    InputSource& operator=(const InputSource&);

    // -----------------------------------------------------------------------

    //  Private data members

    //

    //  fEncoding

    //      This is the encoding to use. Usually this is null, which means

    //      to use the information found in the file itself. But, if set,

    //      this encoding will be used without question.

    //

    //  fPublicId

    //      This is the optional public id for the input source. It can be

    //      null if none is desired.

    //

    //  fSystemId

    //      This is the system id for the input source. This is what is

    //      actually used to open the source.

    //

    //  fFatalErrorIfNotFound

    // -----------------------------------------------------------------------

    MemoryManager* const fMemoryManager;

    XMLCh*         fEncoding;

    XMLCh*         fPublicId;

    XMLCh*         fSystemId;

    bool           fFatalErrorIfNotFound;

};

// ---------------------------------------------------------------------------

//  InputSource: Getter methods

// ---------------------------------------------------------------------------

inline const XMLCh* InputSource::getEncoding() const

{

    return fEncoding;

}

inline const XMLCh* InputSource::getPublicId() const

{

    return fPublicId;

}

inline const XMLCh* InputSource::getSystemId() const

{

    return fSystemId;

}

inline bool InputSource::getIssueFatalErrorIfNotFound() const

{

    return fFatalErrorIfNotFound;

}

inline MemoryManager* InputSource::getMemoryManager() const

{

    return fMemoryManager;

}

// ---------------------------------------------------------------------------

//  InputSource: Setter methods

// ---------------------------------------------------------------------------

inline void InputSource::setIssueFatalErrorIfNotFound(const bool flag)

{

    fFatalErrorIfNotFound = flag;

}

XERCES_CPP_NAMESPACE_END

#endif