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From dona...@apache.org
Subject cvs commit: jakarta-ant/src/main/org/apache/tools/ant/taskdefs/optional/extension Extension.java
Date Thu, 18 Apr 2002 12:47:22 GMT
donaldp     02/04/18 05:47:22

  Added:       src/main/org/apache/tools/ant/taskdefs/optional/extension
                        Extension.java
  Log:
  Copy across Extension class from excalibur.extensions.*
  
  Revision  Changes    Path
  1.1                  jakarta-ant/src/main/org/apache/tools/ant/taskdefs/optional/extension/Extension.java
  
  Index: Extension.java
  ===================================================================
  /*
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2002 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 acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Ant", 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 names without prior written
   *    permission of the Apache Group.
   *
   * 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.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  package org.apache.tools.ant.taskdefs.optional.extension;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.StringTokenizer;
  import java.util.jar.Attributes;
  import java.util.jar.Manifest;
  
  /**
   * <p>Utility class that represents either an available "Optional Package"
   * (formerly known as "Standard Extension") as described in the manifest
   * of a JAR file, or the requirement for such an optional package.</p>
   *
   * <p>For more information about optional packages, see the document
   * <em>Optional Package Versioning</em> in the documentation bundle for your
   * Java2 Standard Edition package, in file
   * <code>guide/extensions/versioning.html</code>.</p>
   *
   * @author <a href="mailto:craigmcc@apache.org">Craig R. McClanahan</a>
   * @author <a href="mailto:peter@apache.org">Peter Donald</a>
   * @version $Revision: 1.1 $ $Date: 2002/04/18 12:47:22 $
   */
  public final class Extension
  {
      /**
       * Manifest Attribute Name object for EXTENSION_LIST.
       * @see Attributes.Name#EXTENSION_LIST
       */
      public static final Attributes.Name EXTENSION_LIST = Attributes.Name.EXTENSION_LIST;
  
      /**
       * <code>Name</code> object for <code>Optional-Extension-List</code>
       * manifest attribute used for declaring optional dependencies on
       * installed extensions. Note that the dependencies declared by this method
       * are not required for the library to operate but if present will be used.
       * It is NOT part of the official "Optional Package" specification.
       *
       * @see <a href="http://java.sun.com/j2se/1.3/docs/guide/extensions/spec.html#dependnecy">
       *      Installed extension dependency</a>
       */
      public static final Attributes.Name OPTIONAL_EXTENSION_LIST = new Attributes.Name( "Optional-Extension-List"
);
  
      /**
       * Manifest Attribute Name object for EXTENSION_NAME.
       * @see Attributes.Name#EXTENSION_NAME
       */
      public static final Attributes.Name EXTENSION_NAME = Attributes.Name.EXTENSION_NAME;
  
      /**
       * Manifest Attribute Name object for SPECIFICATION_VERSION.
       * @see Attributes.Name#SPECIFICATION_VERSION
       */
      public static final Attributes.Name SPECIFICATION_VERSION = Attributes.Name.SPECIFICATION_VERSION;
  
      /**
       * Manifest Attribute Name object for SPECIFICATION_VENDOR.
       * @see Attributes.Name#SPECIFICATION_VENDOR
       */
      public static final Attributes.Name SPECIFICATION_VENDOR = Attributes.Name.SPECIFICATION_VENDOR;
  
      /**
       * Manifest Attribute Name object for IMPLEMENTATION_VERSION.
       * @see Attributes.Name#IMPLEMENTATION_VERSION
       */
      public static final Attributes.Name IMPLEMENTATION_VERSION = Attributes.Name.IMPLEMENTATION_VERSION;
  
      /**
       * Manifest Attribute Name object for IMPLEMENTATION_VENDOR.
       * @see Attributes.Name#IMPLEMENTATION_VENDOR
       */
      public static final Attributes.Name IMPLEMENTATION_VENDOR = Attributes.Name.IMPLEMENTATION_VENDOR;
  
      /**
       * Manifest Attribute Name object for IMPLEMENTATION_URL.
       * @see Attributes.Name#IMPLEMENTATION_URL
       */
      public static final Attributes.Name IMPLEMENTATION_URL = Attributes.Name.IMPLEMENTATION_URL;
  
      /**
       * Manifest Attribute Name object for IMPLEMENTATION_VENDOR_ID.
       * @see Attributes.Name#IMPLEMENTATION_VENDOR_ID
       */
      public static final Attributes.Name IMPLEMENTATION_VENDOR_ID = Attributes.Name.IMPLEMENTATION_VENDOR_ID;
  
      /**
       * Enum indicating that extension is compatible with other extension.
       */
      public static final Compatability COMPATIBLE =
          new Compatability( "COMPATIBLE" );
  
      /**
       * Enum indicating that extension requires an upgrade
       * of specification to be compatible with other extension.
       */
      public static final Compatability REQUIRE_SPECIFICATION_UPGRADE =
          new Compatability( "REQUIRE_SPECIFICATION_UPGRADE" );
  
      /**
       * Enum indicating that extension requires a vendor
       * switch to be compatible with other extension.
       */
      public static final Compatability REQUIRE_VENDOR_SWITCH =
          new Compatability( "REQUIRE_VENDOR_SWITCH" );
  
      /**
       * Enum indicating that extension requires an upgrade
       * of implementation to be compatible with other extension.
       */
      public static final Compatability REQUIRE_IMPLEMENTATION_UPGRADE =
          new Compatability( "REQUIRE_IMPLEMENTATION_UPGRADE" );
  
      /**
       * Enum indicating that extension is incompatible with
       * other extension in ways other than other enums
       * indicate). ie For example the other extension may have
       * a different ID.
       */
      public static final Compatability INCOMPATIBLE =
          new Compatability( "INCOMPATIBLE" );
  
      /**
       * The name of the optional package being made available, or required.
       */
      private String m_extensionName;
  
      /**
       * The version number (dotted decimal notation) of the specification
       * to which this optional package conforms.
       */
      private DeweyDecimal m_specificationVersion;
  
      /**
       * The name of the company or organization that originated the
       * specification to which this optional package conforms.
       */
      private String m_specificationVendor;
  
      /**
       * The unique identifier of the company that produced the optional
       * package contained in this JAR file.
       */
      private String m_implementationVendorID;
  
      /**
       * The name of the company or organization that produced this
       * implementation of this optional package.
       */
      private String m_implementationVendor;
  
      /**
       * The version number (dotted decimal notation) for this implementation
       * of the optional package.
       */
      private DeweyDecimal m_implementationVersion;
  
      /**
       * The URL from which the most recent version of this optional package
       * can be obtained if it is not already installed.
       */
      private String m_implementationURL;
  
      /**
       * Return an array of <code>Extension</code> objects representing optional
       * packages that are available in the JAR file associated with the
       * specified <code>Manifest</code>.  If there are no such optional
       * packages, a zero-length array is returned.
       *
       * @param manifest Manifest to be parsed
       * @return the "available" extensions in specified manifest
       */
      public static Extension[] getAvailable( final Manifest manifest )
      {
          if( null == manifest )
          {
              return new Extension[ 0 ];
          }
  
          final ArrayList results = new ArrayList();
  
          final Attributes mainAttributes = manifest.getMainAttributes();
          if( null != mainAttributes )
          {
              final Extension extension = getExtension( "", mainAttributes );
              if( null != extension )
              {
                  results.add( extension );
              }
          }
  
          final Map entries = manifest.getEntries();
          final Iterator keys = entries.keySet().iterator();
          while( keys.hasNext() )
          {
              final String key = (String)keys.next();
              final Attributes attributes = (Attributes)entries.get( key );
              final Extension extension = getExtension( "", attributes );
              if( null != extension )
              {
                  results.add( extension );
              }
          }
  
          return (Extension[])results.toArray( new Extension[ 0 ] );
      }
  
      /**
       * Return the set of <code>Extension</code> objects representing optional
       * packages that are required by the application contained in the JAR
       * file associated with the specified <code>Manifest</code>.  If there
       * are no such optional packages, a zero-length list is returned.
       *
       * @param manifest Manifest to be parsed
       * @return the dependencies that are specified in manifes
       */
      public static Extension[] getRequired( final Manifest manifest )
      {
          return getListed( manifest, EXTENSION_LIST );
      }
  
      /**
       * Return the set of <code>Extension</code> objects representing "Optional
       * Packages" that the application declares they will use if present. If
       * there are no such optional packages, a zero-length list is returned.
       *
       * @param manifest Manifest to be parsed
       * @return the optional dependencies that are specified in manifest
       */
      public static Extension[] getOptions( final Manifest manifest )
      {
          return getListed( manifest, OPTIONAL_EXTENSION_LIST );
      }
  
      /**
       * Add Extension to the specified manifest Attributes.
       *
       * @param attributes the attributes of manifest to add to
       * @param extension the extension
       */
      public static void addExtension( final Extension extension,
                                       final Attributes attributes )
      {
          addExtension( extension, "", attributes );
      }
  
      /**
       * Add Extension to the specified manifest Attributes.
       * Use the specified prefix so that dependencies can added
       * with a prefix such as "java3d-" etc.
       *
       * @param attributes the attributes of manifest to add to
       * @param extension the extension
       * @param prefix the name to prefix to extension
       */
      public static void addExtension( final Extension extension,
                                       final String prefix,
                                       final Attributes attributes )
      {
          attributes.putValue( prefix + EXTENSION_NAME,
                               extension.getExtensionName() );
  
          final String specificationVendor = extension.getSpecificationVendor();
          if( null != specificationVendor )
          {
              attributes.putValue( prefix + SPECIFICATION_VENDOR,
                                   specificationVendor );
          }
  
          final DeweyDecimal specificationVersion = extension.getSpecificationVersion();
          if( null != specificationVersion )
          {
              attributes.putValue( prefix + SPECIFICATION_VERSION,
                                   specificationVersion.toString() );
          }
  
          final String implementationVendorID = extension.getImplementationVendorID();
          if( null != implementationVendorID )
          {
              attributes.putValue( prefix + IMPLEMENTATION_VENDOR_ID,
                                   implementationVendorID );
          }
  
          final String implementationVendor = extension.getImplementationVendor();
          if( null != implementationVendor )
          {
              attributes.putValue( prefix + IMPLEMENTATION_VENDOR,
                                   implementationVendor );
          }
  
          final DeweyDecimal implementationVersion = extension.getImplementationVersion();
          if( null != implementationVersion )
          {
              attributes.putValue( prefix + IMPLEMENTATION_VERSION,
                                   implementationVersion.toString() );
          }
  
          final String implementationURL = extension.getImplementationURL();
          if( null != implementationURL )
          {
              attributes.putValue( prefix + IMPLEMENTATION_URL,
                                   implementationURL );
          }
      }
  
      /**
       * The constructor to create Extension object.
       * Note that every component is allowed to be specified
       * but only the extensionName is mandatory.
       *
       * @param extensionName the name of extension.
       * @param specificationVersion the specification Version of extension.
       * @param specificationVendor the specification Vendor of extension.
       * @param implementationVersion the implementation Version of extension.
       * @param implementationVendor the implementation Vendor of extension.
       * @param implementationVendorId the implementation VendorId of extension.
       * @param implementationURL the implementation URL of extension.
       */
      public Extension( final String extensionName,
                        final String specificationVersion,
                        final String specificationVendor,
                        final String implementationVersion,
                        final String implementationVendor,
                        final String implementationVendorId,
                        final String implementationURL )
      {
          m_extensionName = extensionName;
          m_specificationVendor = specificationVendor;
  
          if( null != specificationVersion )
          {
              try
              {
                  m_specificationVersion = new DeweyDecimal( specificationVersion );
              }
              catch( final NumberFormatException nfe )
              {
                  final String error = "Bad specification version format '" + specificationVersion
+
                      "' in '" + extensionName + "'. (Reason: " + nfe + ")";
                  throw new IllegalArgumentException( error );
              }
          }
  
          m_implementationURL = implementationURL;
          m_implementationVendor = implementationVendor;
          m_implementationVendorID = implementationVendorId;
  
          if( null != implementationVersion )
          {
              try
              {
                  m_implementationVersion = new DeweyDecimal( implementationVersion );
              }
              catch( final NumberFormatException nfe )
              {
                  final String error = "Bad implementation version format '" + implementationVersion
+
                      "' in '" + extensionName + "'. (Reason: " + nfe + ")";
                  throw new IllegalArgumentException( error );
              }
          }
  
          if( null == m_extensionName )
          {
              throw new NullPointerException( "extensionName property is null" );
          }
      }
  
      /**
       * Get the name of the extension.
       *
       * @return the name of the extension
       */
      public String getExtensionName()
      {
          return m_extensionName;
      }
  
      /**
       * Get the vendor of the extensions specification.
       *
       * @return the vendor of the extensions specification.
       */
      public String getSpecificationVendor()
      {
          return m_specificationVendor;
      }
  
      /**
       * Get the version of the extensions specification.
       *
       * @return the version of the extensions specification.
       */
      public DeweyDecimal getSpecificationVersion()
      {
          return m_specificationVersion;
      }
  
      /**
       * Get the url of the extensions implementation.
       *
       * @return the url of the extensions implementation.
       */
      public String getImplementationURL()
      {
          return m_implementationURL;
      }
  
      /**
       * Get the vendor of the extensions implementation.
       *
       * @return the vendor of the extensions implementation.
       */
      public String getImplementationVendor()
      {
          return m_implementationVendor;
      }
  
      /**
       * Get the vendorID of the extensions implementation.
       *
       * @return the vendorID of the extensions implementation.
       */
      public String getImplementationVendorID()
      {
          return m_implementationVendorID;
      }
  
      /**
       * Get the version of the extensions implementation.
       *
       * @return the version of the extensions implementation.
       */
      public DeweyDecimal getImplementationVersion()
      {
          return m_implementationVersion;
      }
  
      /**
       * Return a Compatibility enum indicating the relationship of this
       * <code>Extension</code> with the specified <code>Extension</code>.
       *
       * @param required Description of the required optional package
       * @return the enum indicating the compatability (or lack thereof)
       *         of specifed extension
       */
      public Compatability getCompatibilityWith( final Extension required )
      {
          // Extension Name must match
          if( !m_extensionName.equals( required.getExtensionName() ) )
          {
              return INCOMPATIBLE;
          }
  
          // Available specification version must be >= required
          final DeweyDecimal specificationVersion = required.getSpecificationVersion();
          if( null != specificationVersion )
          {
              if( null == m_specificationVersion ||
                  !isCompatible( m_specificationVersion, specificationVersion ) )
              {
                  return REQUIRE_SPECIFICATION_UPGRADE;
              }
          }
  
          // Implementation Vendor ID must match
          final String implementationVendorId = required.getImplementationVendorID();
          if( null != implementationVendorId )
          {
              if( null == m_implementationVendorID ||
                  !m_implementationVendorID.equals( implementationVendorId ) )
              {
                  return REQUIRE_VENDOR_SWITCH;
              }
          }
  
          // Implementation version must be >= required
          final DeweyDecimal implementationVersion = required.getImplementationVersion();
          if( null != implementationVersion )
          {
              if( null == m_implementationVersion ||
                  !isCompatible( m_implementationVersion, implementationVersion ) )
              {
                  return REQUIRE_IMPLEMENTATION_UPGRADE;
              }
          }
  
          // This available optional package satisfies the requirements
          return COMPATIBLE;
      }
  
      /**
       * Return <code>true</code> if the specified <code>Extension</code>
       * (which represents an optional package required by an application)
       * is satisfied by this <code>Extension</code> (which represents an
       * optional package that is already installed.  Otherwise, return
       * <code>false</code>.
       *
       * @param required Description of the required optional package
       * @return true if the specified extension is compatible with this extension
       */
      public boolean isCompatibleWith( final Extension required )
      {
          return ( COMPATIBLE == getCompatibilityWith( required ) );
      }
  
      /**
       * Return a String representation of this object.
       *
       * @return string representation of object.
       */
      public String toString()
      {
          final String lineSeparator = System.getProperty( "line.separator" );
          final String brace = ": ";
  
          final StringBuffer sb = new StringBuffer( EXTENSION_NAME.toString() );
          sb.append( brace );
          sb.append( m_extensionName );
          sb.append( lineSeparator );
  
          if( null != m_specificationVersion )
          {
              sb.append( SPECIFICATION_VERSION );
              sb.append( brace );
              sb.append( m_specificationVersion );
              sb.append( lineSeparator );
          }
  
          if( null != m_specificationVendor )
          {
              sb.append( SPECIFICATION_VENDOR );
              sb.append( brace );
              sb.append( m_specificationVendor );
              sb.append( lineSeparator );
          }
  
          if( null != m_implementationVersion )
          {
              sb.append( IMPLEMENTATION_VERSION );
              sb.append( brace );
              sb.append( m_implementationVersion );
              sb.append( lineSeparator );
          }
  
          if( null != m_implementationVendorID )
          {
              sb.append( IMPLEMENTATION_VENDOR_ID );
              sb.append( brace );
              sb.append( m_implementationVendorID );
              sb.append( lineSeparator );
          }
  
          if( null != m_implementationVendor )
          {
              sb.append( IMPLEMENTATION_VENDOR );
              sb.append( brace );
              sb.append( m_implementationVendor );
              sb.append( lineSeparator );
          }
  
          if( null != m_implementationURL )
          {
              sb.append( IMPLEMENTATION_URL );
              sb.append( brace );
              sb.append( m_implementationURL );
              sb.append( lineSeparator );
          }
  
          return sb.toString();
      }
  
      /**
       * Return <code>true</code> if the first version number is greater than
       * or equal to the second; otherwise return <code>false</code>.
       *
       * @param first First version number (dotted decimal)
       * @param second Second version number (dotted decimal)
       */
      private boolean isCompatible( final DeweyDecimal first, final DeweyDecimal second )
      {
          return first.isGreaterThanOrEqual( second );
      }
  
      /**
       * Retrieve all the extensions listed under a particular key
       * (Usually EXTENSION_LIST or OPTIONAL_EXTENSION_LIST).
       *
       * @param manifest the manifest to extract extensions from
       * @param listKey the key used to get list (Usually
       *        EXTENSION_LIST or OPTIONAL_EXTENSION_LIST)
       * @return the list of listed extensions
       */
      private static Extension[] getListed( final Manifest manifest,
                                            final Attributes.Name listKey )
      {
          final ArrayList results = new ArrayList();
          final Attributes mainAttributes = manifest.getMainAttributes();
  
          if( null != mainAttributes )
          {
              getExtension( mainAttributes, results, listKey );
          }
  
          final Map entries = manifest.getEntries();
          final Iterator keys = entries.keySet().iterator();
          while( keys.hasNext() )
          {
              final String key = (String)keys.next();
              final Attributes attributes = (Attributes)entries.get( key );
              getExtension( attributes, results, listKey );
          }
  
          return (Extension[])results.toArray( new Extension[ 0 ] );
      }
  
      /**
       * Add required optional packages defined in the specified attributes entry, if any.
       *
       * @param attributes Attributes to be parsed
       * @param required list to add required optional packages to
       * @param listKey the key to use to lookup list, usually EXTENSION_LIST
       *    or OPTIONAL_EXTENSION_LIST
       */
      private static void getExtension( final Attributes attributes,
                                       final ArrayList required,
                                       final Attributes.Name listKey )
      {
          final String names = attributes.getValue( listKey );
          if( null == names )
          {
              return;
          }
  
          final String[] extentions = split( names, " " );
          for( int i = 0; i < extentions.length; i++ )
          {
              final String prefix = extentions[ i ] + "-";
              final Extension extension = getExtension( prefix, attributes );
  
              if( null != extension )
              {
                  required.add( extension );
              }
          }
      }
  
      /**
       * Splits the string on every token into an array of strings.
       *
       * @param string the string
       * @param onToken the token
       * @return the resultant array
       */
      private static final String[] split( final String string, final String onToken )
      {
          final StringTokenizer tokenizer = new StringTokenizer( string, onToken );
          final String[] result = new String[ tokenizer.countTokens() ];
  
          for( int i = 0; i < result.length; i++ )
          {
              result[ i ] = tokenizer.nextToken();
          }
  
          return result;
      }
  
      /**
       * Extract an Extension from Attributes.
       * Prefix indicates the prefix checked for each string.
       * Usually the prefix is <em>"&lt;extension&gt;-"</em> if looking
for a
       * <b>Required</b> extension. If you are looking for an <b>Available</b>
extension
       * then the prefix is <em>""</em>.
       *
       * @param prefix the prefix for each attribute name
       * @param attributes Attributes to searched
       * @return the new Extension object, or null
       */
      private static Extension getExtension( final String prefix, final Attributes attributes
)
      {
          //WARNING: We trim the values of all the attributes because
          //Some extension declarations are badly defined (ie have spaces
          //after version or vendorID)
          final String nameKey = prefix + EXTENSION_NAME;
          final String name = getTrimmedString( attributes.getValue( nameKey ) );
          if( null == name )
          {
              return null;
          }
  
          final String specVendorKey = prefix + SPECIFICATION_VENDOR;
          final String specVendor = getTrimmedString( attributes.getValue( specVendorKey )
);
          final String specVersionKey = prefix + SPECIFICATION_VERSION;
          final String specVersion = getTrimmedString( attributes.getValue( specVersionKey
) );
  
          final String impVersionKey = prefix + IMPLEMENTATION_VERSION;
          final String impVersion = getTrimmedString( attributes.getValue( impVersionKey )
);
          final String impVendorKey = prefix + IMPLEMENTATION_VENDOR;
          final String impVendor = getTrimmedString( attributes.getValue( impVendorKey ) );
          final String impVendorIDKey = prefix + IMPLEMENTATION_VENDOR_ID;
          final String impVendorId = getTrimmedString( attributes.getValue( impVendorIDKey
) );
          final String impURLKey = prefix + IMPLEMENTATION_URL;
          final String impURL = getTrimmedString( attributes.getValue( impURLKey ) );
  
          return new Extension( name, specVersion, specVendor, impVersion,
                                impVendor, impVendorId, impURL );
      }
  
      /**
       * Trim the supplied string if the string is non-null
       *
       * @param value the string to trim or null
       * @return the trimmed string or null
       */
      private static String getTrimmedString( final String value )
      {
          if( null == value )
          {
              return null;
          }
          else
          {
              return value.trim();
          }
      }
  }
  
  
  

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