PlatformUtils.hpp
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上传日期:2007-01-10
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文件大小:21k
源码类别:
xml/soap/webservice
开发平台:
C/C++
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Id: PlatformUtils.hpp,v 1.12 2001/10/25 21:52:28 peiyongz Exp $
- */
- #if !defined(PLATFORMUTILS_HPP)
- #define PLATFORMUTILS_HPP
- #include <util/XercesDefs.hpp>
- #include <util/XMLException.hpp>
- class XMLMsgLoader;
- class XMLNetAccessor;
- class XMLTransService;
- //
- // For internal use only
- //
- // This class provides a simple abstract API via which lazily evaluated
- // data can be cleaned up.
- //
- class XMLUTIL_EXPORT XMLDeleter
- {
- public :
- virtual ~XMLDeleter();
- protected :
- XMLDeleter();
- private :
- XMLDeleter(const XMLDeleter&);
- void operator=(const XMLDeleter&);
- };
- /**
- * Utilities that must be implemented in a platform-specific way.
- *
- * This class contains methods that must be implemented in a platform
- * specific manner. The actual implementations of these methods are
- * available in the per-platform files indide <code>src/util/Platforms
- * </code>.
- */
- class XMLUTIL_EXPORT XMLPlatformUtils
- {
- public :
- /** @name Public Types */
- //@{
- enum PanicReasons
- {
- Panic_NoTransService
- , Panic_NoDefTranscoder
- , Panic_CantFindLib
- , Panic_UnknownMsgDomain
- , Panic_CantLoadMsgDomain
- , Panic_SynchronizationErr
- , Panic_SystemInit
- , PanicReasons_Count
- };
- //@}
- /** @name Public Static Data */
- //@{
- /** The network accessor
- *
- * This is provided by the per-platform driver, so each platform can
- * choose what actual implementation it wants to use. The object must
- * be dynamically allocated.
- *
- * <i>Note that you may optionally, if your platform driver does not
- * install a network accessor, set it manually from your client code
- * after calling Initialize(). This works because this object is
- * not required during initialization, and only comes into play during
- * actual XML parsing.</i>
- */
- static XMLNetAccessor* fgNetAccessor;
- /** The transcoding service.
- *
- * This is provided by the per platform driver, so each platform can
- * choose what implemenation it wants to use. When the platform
- * independent initialization code needs to get a transcoding service
- * object, it will call <code>makeTransService()</code> to ask the
- * per-platform code to create one. Only one transcoding service
- * object is reqeusted per-process, so it is shared and synchronized
- * among parser instances within that process.
- */
- static XMLTransService* fgTransService;
- //@}
- /** @name Initialization amd Panic methods */
- //@{
- /** Perform per-process parser initialization
- *
- * Initialization <b>must</b> be called first in any client code.
- */
- static void Initialize();
- /** Perform per-process parser termination
- *
- * The termination call is currently optional, to aid those dynamically
- * loading the parser to clean up before exit, or to avoid spurious
- * reports from leak detectors.
- */
- static void Terminate();
- /** The panic mechanism.
- *
- * If, during initialization, we cannot even get far enough along
- * to get transcoding up or get message loading working, we call
- * this method.</p>
- *
- * Each platform can implement it however they want. This method is
- * expected to display something meaningful and end the process. The
- * enum indicates why its being called, to allow the per-platform code
- * to display or log something more specific if desired.</p>
- *
- * @param reason The enumeration that defines the cause of the failure
- */
- static void panic
- (
- const PanicReasons reason
- );
- //@}
- /** @name File Methods */
- //@{
- /** Get the current file position
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to deterine the current position within
- * the passed file.
- *
- * Since the file API provided here only reads, if the host platform
- * supports separate read/write positions, only the read position is
- * of any interest, and hence should be the one returned.
- *
- * @param theFile The file handle
- */
- static unsigned int curFilePos(FileHandle theFile);
- /** Closes the file handle
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to close the passed file handle, and to
- * destroy the passed file handle and any allocated data or system
- * resources it contains.
- *
- * @param theFile The file handle to close
- */
- static void closeFile(FileHandle theFile);
- /** Returns the file size
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to determine the current size of the file
- * represented by the passed handle.
- *
- * @param theFile The file handle whose size you want
- *
- * @return Returns the size of the file in bytes
- */
- static unsigned int fileSize(FileHandle theFile);
- /** Opens the file
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to open passed file. If it fails, a
- * null handle pointer should be returned.
- *
- * @param fileName The string containing the name of the file
- *
- * @return The file handle of the opened file
- */
- static FileHandle openFile(const char* const fileName);
- /** Opens a named file
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to open the passed file. If it fails, a
- * null handle pointer should be returned.
- *
- * @param fileName The string containing the name of the file
- *
- * @return The file handle of the opened file
- */
- static FileHandle openFile(const XMLCh* const fileName);
- /** Opens the standard input as a file
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to open a handle to the standard input.
- * It should be a copy of the standard input handle, since it will
- * be closed later!
- *
- * @return The file handle of the standard input stream
- */
- static FileHandle openStdInHandle();
- /** Reads the file buffer
- *
- * This must be implemented by the per-platform driver, which should
- * use local file services to read up to 'toRead' bytes of data from
- * the passed file, and return those bytes in the 'toFill' buffer. It
- * is not an error not to read the requested number of bytes. When the
- * end of file is reached, zero should be returned.
- *
- * @param theFile The file handle to be read from.
- * @param toRead The maximum number of byte to read from the current
- * position
- * @param toFill The byte buffer to fill
- *
- * @return Returns the number of bytes read from the stream or file
- */
- static unsigned int readFileBuffer
- (
- FileHandle theFile
- , const unsigned int toRead
- , XMLByte* const toFill
- );
- /** Resets the file handle
- *
- * This must be implemented by the per-platform driver which will use
- * local file services to reset the file position to the start of the
- * the file.
- *
- * @param theFile The file handle that you want to reset
- */
- static void resetFile(FileHandle theFile);
- //@}
- /** @name File System Methods */
- //@{
- /** Gets the full path from a relative path
- *
- * This must be implemented by the per-platform driver. It should
- * complete a relative path using the 'current directory', or whatever
- * the local equivalent of a current directory is. If the passed
- * source path is actually fully qualified, then a straight copy of it
- * will be returned.
- *
- * @param srcPath The path of the file for which you want the full path
- *
- * @return Returns the fully qualified path of the file name including
- * the file name. This is dyanmically allocated and must be deleted
- * by the caller when its no longer needed!
- */
- static XMLCh* getFullPath(const XMLCh* const srcPath);
- /** Determines if a path is relative or absolute
- *
- * This must be implemented by the per-platform driver, which should
- * determine whether the passed path is relative or not. The concept
- * of relative and absolute might be... well relative on different
- * platforms. But, as long as the determination is made consistently
- * and in coordination with the weavePaths() method, it should work
- * for any platform.
- *
- * @param toCheck The file name which you want to check
- *
- * @return Returns true if the filename appears to be relative
- */
- static bool isRelative(const XMLCh* const toCheck);
- /** Utility to join two paths
- *
- * This must be implemented by the per-platform driver, and should
- * weave the relative path part together with the base part and return
- * a new path that represents this combination.
- *
- * If the relative part turns out to be fully qualified, it will be
- * returned as is. If it is not, then it will be woven onto the
- * passed base path, by removing one path component for each leading
- * "../" (or whatever is the equivalent in the local system) in the
- * relative path.
- *
- * @param basePath The string containing the base path
- * @param relativePath The string containing the relative path
- *
- * @return Returns a string containing the 'woven' path. It should
- * be dynamically allocated and becomes the responsibility of the
- * caller to delete.
- */
- static XMLCh* weavePaths
- (
- const XMLCh* const basePath
- , const XMLCh* const relativePath
- );
- //@}
- /** @name Timing Methods */
- //@{
- /** Gets the system time in milliseconds
- *
- * This must be implemented by the per-platform driver, which should
- * use local services to return the current value of a running
- * millisecond timer. Note that the value returned is only as accurate
- * as the millisecond time of the underyling host system.
- *
- * @return Returns the system time as an unsigned long
- */
- static unsigned long getCurrentMillis();
- //@}
- /** @name Mutex Methods */
- //@{
- /** Closes a mutex handle
- *
- * Each per-platform driver must implement this. Only it knows what
- * the actual content of the passed mutex handle is.
- *
- * @param mtxHandle The mutex handle that you want to close
- */
- static void closeMutex(void* const mtxHandle);
- /** Locks a mutex handle
- *
- * Each per-platform driver must implement this. Only it knows what
- * the actual content of the passed mutex handle is.
- *
- * @param mtxHandle The mutex handle that you want to lock
- */
- static void lockMutex(void* const mtxHandle);
- /** Make a new mutex
- *
- * Each per-platform driver must implement this. Only it knows what
- * the actual content of the passed mutex handle is. The returned
- * handle pointer will be eventually passed to closeMutex() which is
- * also implemented by the platform driver.
- */
- static void* makeMutex();
- /** Unlocks a mutex
- *
- * Each per-platform driver must implement this. Only it knows what
- * the actual content of the passed mutex handle is.
- *
- * Note that, since the underlying system synchronization services
- * are used, Xerces cannot guarantee that lock/unlock operaitons are
- * correctly enforced on a per-thread basis or that incorrect nesting
- * of lock/unlock operations will be caught.
- *
- * @param mtxGandle The mutex handle that you want to unlock
- */
- static void unlockMutex(void* const mtxHandle);
- //@}
- /** @name External Message Support */
- //@{
- /** Loads the message set from among the available domains
- *
- * The returned object must be dynamically allocated and the caller
- * becomes responsible for cleaning it up.
- *
- * @param msgDomain The message domain which you want to load
- */
- static XMLMsgLoader* loadMsgSet(const XMLCh* const msgDomain);
- //@}
- /** @name Miscellaneous synchronization methods */
- //@{
- /** Conditionally updates or returns a single word variable atomically
- *
- * This must be implemented by the per-platform driver. The
- * compareAndSwap subroutine performs an atomic operation which
- * compares the contents of a single word variable with a stored old
- * value. If the values are equal, a new value is stored in the single
- * word variable and TRUE is returned; otherwise, the old value is set
- * to the current value of the single word variable and FALSE is
- * returned.
- *
- * The compareAndSwap subroutine is useful when a word value must be
- * updated only if it has not been changed since it was last read.
- *
- * Note: The word containing the single word variable must be aligned
- * on a full word boundary.
- *
- * @param toFill Specifies the address of the single word variable
- * @param newValue Specifies the new value to be conditionally assigned
- * to the single word variable.
- * @param toCompare Specifies the address of the old value to be checked
- * against (and conditionally updated with) the value of the single word
- * variable.
- *
- * @return Returns the new value assigned to the single word variable
- */
- static void* compareAndSwap
- (
- void** toFill
- , const void* const newValue
- , const void* const toCompare
- );
- //@}
- /** @name Atomic Increment and Decrement */
- //@{
- /** Increments a single word variable atomically.
- *
- * This must be implemented by the per-platform driver. The
- * atomicIncrement subroutine increments one word in a single atomic
- * operation. This operation is useful when a counter variable is shared
- * between several threads or processes. When updating such a counter
- * variable, it is important to make sure that the fetch, update, and
- * store operations occur atomically (are not interruptible).
- *
- * @param location Specifies the address of the word variable to be
- * incremented.
- *
- * @return The function return value is positive if the result of the
- * operation was positive. Zero if the result of the operation was zero.
- * Negative if the result of the operation was negative. Except for the
- * zero case, the value returned may differ from the actual result of
- * the operation - only the sign and zero/nonzero state is guaranteed
- * to be correct.
- */
- static int atomicIncrement(int& location);
- /** Decrements a single word variable atomically.
- *
- * This must be implemented by the per-platform driver. The
- * atomicDecrement subroutine increments one word in a single atomic
- * operation. This operation is useful when a counter variable is shared
- * between several threads or processes. When updating such a counter
- * variable, it is important to make sure that the fetch, update, and
- * store operations occur atomically (are not interruptible).
- *
- * @param location Specifies the address of the word variable to be
- * decremented.
- *
- * @return The function return value is positive if the result of the
- * operation was positive. Zero if the result of the operation was zero.
- * Negative if the result of the operation was negative. Except for the
- * zero case, the value returned may differ from the actual result of the
- * operation - only the sign and zero/nonzero state is guaranteed to be
- * correct.
- */
- static int atomicDecrement(int& location);
- //@}
- /** @name NEL Character Handling */
- //@{
- /**
- * This function enables the recognition of NEL char as whitespace chars
- * which is disabled by default.
- * It is only called once per process. Once it is set, any subsequent calls
- * will result in exception being thrown.
- *
- * Note: Turning this option on will make the parser non complicant.
- */
- static void recognizeNEL(bool state);
- /**
- * Return the value of fgNEL flag.
- */
- static bool isNELRecognized();
- //@}
- private :
- /** @name Private static methods */
- //@{
- /** Loads a message set from the available domains
- *
- * @param msgDomain The message domain containing the message to be
- * loaded
- */
- static XMLMsgLoader* loadAMsgSet(const XMLCh* const msgDomain);
- /** Creates a net accessor object.
- *
- * Each per-platform driver must implement this method. However,
- * having a Net Accessor is optional and this method can return a
- * null pointer if remote access via HTTP and FTP URLs is not required.
- *
- * @return An object derived from XMLNetAccessor. It must be dynamically
- * allocated, since it will be deleted later.
- */
- static XMLNetAccessor* makeNetAccessor();
- /** Creates a Transoding service
- *
- * Each per-platform driver must implement this method and return some
- * derivative of the XMLTransService class. This object serves as the
- * transcoder factory for this process. The object must be dynamically
- * allocated and the caller is responsible for cleaning it up.
- *
- * @return A dynamically allocated object of some class derived from
- * the XMLTransService class.
- */
- static XMLTransService* makeTransService();
- /** Does initialization for a particular platform
- *
- * Each per-platform driver must implement this to do any low level
- * system initialization required. It <b>cannot</b> use any XML
- * parser or utilities services!
- */
- static void platformInit();
- /** Does termination for a particular platform
- *
- * Each per-platform driver must implement this to do any low level
- * system resource cleanup required. It <b>cannot</b> use any XML
- * parser or utilities services!
- */
- static void platformTerm();
- //@}
- };
- MakeXMLException(XMLPlatformUtilsException, XMLUTIL_EXPORT)
- // ---------------------------------------------------------------------------
- // XMLDeleter: Public Destructor
- // ---------------------------------------------------------------------------
- inline XMLDeleter::~XMLDeleter()
- {
- }
- // ---------------------------------------------------------------------------
- // XMLDeleter: Hidden constructors and operators
- // ---------------------------------------------------------------------------
- inline XMLDeleter::XMLDeleter()
- {
- }
- #endif