Java PrefixResolver类代码示例

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
* Creates a parsed XPath expression with resolved namespaces. This is
* useful when an expression will be reused in an application since it
* makes it possible to compile the expression string into a more
* efficient internal form and preresolve all namespace prefixes which
* occur within the expression.
*
* @param expression The XPath expression string to be parsed.
* @param resolver The <code>resolver</code> permits translation of
*   prefixes within the XPath expression into appropriate namespace URIs
*   . If this is specified as <code>null</code>, any namespace prefix
*   within the expression will result in <code>DOMException</code>
*   being thrown with the code <code>NAMESPACE_ERR</code>.
* @return The compiled form of the XPath expression.
* @exception XPathException
*   INVALID_EXPRESSION_ERR: Raised if the expression is not legal
*   according to the rules of the <code>XPathEvaluator</code>i
* @exception DOMException
*   NAMESPACE_ERR: Raised if the expression contains namespace prefixes
*   which cannot be resolved by the specified
*   <code>XPathNSResolver</code>.
*
    * @see org.w3c.dom.xpath.XPathEvaluator#createExpression(String, XPathNSResolver)
    */
   public XPathExpression createExpression(
           String expression,
           XPathNSResolver resolver)
           throws XPathException, DOMException {

           try {

                   // If the resolver is null, create a dummy prefix resolver
                   XPath xpath =  new XPath(expression,null,
                        ((null == resolver) ? new DummyPrefixResolver() : ((PrefixResolver)resolver)),
                         XPath.SELECT);

       return new XPathExpressionImpl(xpath, m_doc);

           } catch (TransformerException e) {
                   // Need to pass back exception code DOMException.NAMESPACE_ERR also.
                   // Error found in DOM Level 3 XPath Test Suite.
                   if(e instanceof XPathStylesheetDOM3Exception)
                           throw new DOMException(DOMException.NAMESPACE_ERR,e.getMessageAndLocation());
                   else
                           throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,e.getMessageAndLocation());

           }
   }
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Used core method for getting {@code ScriptEngine} from {@code
 * org.netbeans.modules.templates.ScriptingCreateFromTemplateHandler}.
 */
private static ScriptEngine getScriptEngine() {
    if (manager == null) {
        synchronized (FileUtil.class) {
            if (manager == null) {
                ClassLoader loader = Lookup.getDefault().lookup(ClassLoader.class);
                try {
                    loader.loadClass(PrefixResolver.class.getName());
                } catch (ClassNotFoundException ex) {
                    Exceptions.printStackTrace(ex);
                }
                manager = new ScriptEngineManager(loader != null ? loader : Thread.currentThread().getContextClassLoader());
            }
        }
    }
    return manager.getEngineByName((String) "freemarker");
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Create a LocPathIterator object.
 *
 * @param nscontext The namespace context for this iterator,
 * should be OK if null.
 */
protected LocPathIterator(PrefixResolver nscontext)
{

  setLocPathIterator(this);
  m_prefixResolver = nscontext;
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Construct an XPath object.
 *
 * (Needs review -sc) This method initializes an XPathParser/
 * Compiler and compiles the expression.
 * @param exprString The XPath expression.
 * @param locator The location of the expression, may be null.
 * @param prefixResolver A prefix resolver to use to resolve prefixes to
 *                       namespace URIs.
 * @param type one of {@link #SELECT} or {@link #MATCH}.
 * @param errorListener The error listener, or null if default should be used.
 *
 * @throws javax.xml.transform.TransformerException if syntax or other error.
 */
public XPath(
        String exprString, SourceLocator locator, PrefixResolver prefixResolver, int type,
        ErrorListener errorListener)
          throws javax.xml.transform.TransformerException
{
  initFunctionTable();
  if(null == errorListener)
    errorListener = new com.sun.org.apache.xml.internal.utils.DefaultErrorHandler();

  m_patternString = exprString;

  XPathParser parser = new XPathParser(errorListener, locator);
  Compiler compiler = new Compiler(errorListener, locator, m_funcTable);

  if (SELECT == type)
    parser.initXPath(compiler, exprString, prefixResolver);
  else if (MATCH == type)
    parser.initMatchPattern(compiler, exprString, prefixResolver);
  else
    throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_CANNOT_DEAL_XPATH_TYPE, new Object[]{Integer.toString(type)})); //"Can not deal with XPath type: " + type);

  // System.out.println("----------------");
  Expression expr = compiler.compile(0);

  // System.out.println("expr: "+expr);
  this.setExpression(expr);

  if((null != locator) && locator instanceof ExpressionNode)
  {
      expr.exprSetParent((ExpressionNode)locator);
  }

}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Create a Lexer object.
 *
 * @param compiler The owning compiler for this lexer.
 * @param resolver The prefix resolver for mapping qualified name prefixes
 *                 to namespace URIs.
 * @param xpathProcessor The parser that is processing strings to opcodes.
 */
Lexer(Compiler compiler, PrefixResolver resolver,
      XPathParser xpathProcessor)
{

  m_compiler = compiler;
  m_namespaceContext = resolver;
  m_processor = xpathProcessor;
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 *   Evaluate XPath string to an XObject.
 *   XPath namespace prefixes are resolved from the namespaceNode.
 *   The implementation of this is a little slow, since it creates
 *   a number of objects each time it is called.  This could be optimized
 *   to keep the same objects around, but then thread-safety issues would arise.
 *
 *   @param contextNode The node to start searching from.
 *   @param str A valid XPath string.
 *   @param prefixResolver Will be called if the parser encounters namespace
 *                         prefixes, to resolve the prefixes to URLs.
 *   @return An XObject, which can be used to obtain a string, number, nodelist, etc, should never be null.
 *   @see com.sun.org.apache.xpath.internal.objects.XObject
 *   @see com.sun.org.apache.xpath.internal.objects.XNull
 *   @see com.sun.org.apache.xpath.internal.objects.XBoolean
 *   @see com.sun.org.apache.xpath.internal.objects.XNumber
 *   @see com.sun.org.apache.xpath.internal.objects.XString
 *   @see com.sun.org.apache.xpath.internal.objects.XRTreeFrag
 *
 * @throws TransformerException
 */
public static XObject eval(
        Node contextNode, String str, PrefixResolver prefixResolver)
          throws TransformerException
{

  // Since we don't have a XML Parser involved here, install some default support
  // for things like namespaces, etc.
  // (Changed from: XPathContext xpathSupport = new XPathContext();
  //    because XPathContext is weak in a number of areas... perhaps
  //    XPathContext should be done away with.)
  // Create the XPath object.
  XPath xpath = new XPath(str, null, prefixResolver, XPath.SELECT, null);

  // Execute the XPath, and have it return the result
  XPathContext xpathSupport = new XPathContext();
  int ctxtNode = xpathSupport.getDTMHandleFromNode(contextNode);

  return xpath.execute(xpathSupport, ctxtNode, prefixResolver);
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Execute the expression.  Meant for reuse by other FilterExpr iterators
 * that are not derived from this object.
 */
public static XNodeSet executeFilterExpr(int context, XPathContext xctxt,
                                                                                              PrefixResolver prefixResolver,
                                                                                              boolean isTopLevel,
                                                                                              int stackFrame,
                                                                                              Expression expr )
  throws com.sun.org.apache.xml.internal.utils.WrappedRuntimeException
{
  PrefixResolver savedResolver = xctxt.getNamespaceContext();
  XNodeSet result = null;

  try
  {
    xctxt.pushCurrentNode(context);
    xctxt.setNamespaceContext(prefixResolver);

    // The setRoot operation can take place with a reset operation,
    // and so we may not be in the context of LocPathIterator#nextNode,
    // so we have to set up the variable context, execute the expression,
    // and then restore the variable context.

    if (isTopLevel)
    {
      // System.out.println("calling m_expr.execute(getXPathContext())");
      VariableStack vars = xctxt.getVarStack();

      // These three statements need to be combined into one operation.
      int savedStart = vars.getStackFrame();
      vars.setStackFrame(stackFrame);

      result = (com.sun.org.apache.xpath.internal.objects.XNodeSet) expr.execute(xctxt);
      result.setShouldCacheNodes(true);

      // These two statements need to be combined into one operation.
      vars.setStackFrame(savedStart);
    }
    else
        result = (com.sun.org.apache.xpath.internal.objects.XNodeSet) expr.execute(xctxt);

  }
  catch (javax.xml.transform.TransformerException se)
  {

    // TODO: Fix...
    throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException(se);
  }
  finally
  {
    xctxt.popCurrentNode();
    xctxt.setNamespaceContext(savedResolver);
  }
  return result;
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 *   Evaluate XPath string to an XObject.
 *   XPath namespace prefixes are resolved from the namespaceNode.
 *   The implementation of this is a little slow, since it creates
 *   a number of objects each time it is called.  This could be optimized
 *   to keep the same objects around, but then thread-safety issues would arise.
 *
 *   @param contextNode The node to start searching from.
 *   @param str A valid XPath string.
 *   @param prefixResolver Will be called if the parser encounters namespace
 *                         prefixes, to resolve the prefixes to URLs.
 *   @return An XObject, which can be used to obtain a string, number, nodelist, etc, should never be null.
 *   @see com.sun.org.apache.xpath.internal.objects.XObject
 *   @see com.sun.org.apache.xpath.internal.objects.XNull
 *   @see com.sun.org.apache.xpath.internal.objects.XBoolean
 *   @see com.sun.org.apache.xpath.internal.objects.XNumber
 *   @see com.sun.org.apache.xpath.internal.objects.XString
 *   @see com.sun.org.apache.xpath.internal.objects.XRTreeFrag
 *
 * @throws TransformerException
 */
public  XObject eval(
        Node contextNode, String str, PrefixResolver prefixResolver)
          throws TransformerException
{

  // Since we don't have a XML Parser involved here, install some default support
  // for things like namespaces, etc.
  // (Changed from: XPathContext xpathSupport = new XPathContext();
  //    because XPathContext is weak in a number of areas... perhaps
  //    XPathContext should be done away with.)
  // Create the XPath object.
  XPath xpath = new XPath(str, null, prefixResolver, XPath.SELECT, null);

  // Execute the XPath, and have it return the result
  XPathContext xpathSupport = new XPathContext();
  int ctxtNode = xpathSupport.getDTMHandleFromNode(contextNode);

  return xpath.execute(xpathSupport, ctxtNode, prefixResolver);
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Given an string, init an XPath object for selections,
 * in order that a parse doesn't
 * have to be done each time the expression is evaluated.
 *
 * @param compiler The compiler object.
 * @param expression A string conforming to the XPath grammar.
 * @param namespaceContext An object that is able to resolve prefixes in
 * the XPath to namespaces.
 *
 * @throws javax.xml.transform.TransformerException
 */
public void initXPath(
        Compiler compiler, String expression, PrefixResolver namespaceContext)
          throws javax.xml.transform.TransformerException
{

  m_ops = compiler;
  m_namespaceContext = namespaceContext;
  m_functionTable = compiler.getFunctionTable();

  Lexer lexer = new Lexer(compiler, namespaceContext, this);

  lexer.tokenize(expression);

  m_ops.setOp(0,OpCodes.OP_XPATH);
  m_ops.setOp(OpMap.MAPINDEX_LENGTH,2);


      // Patch for Christine's gripe. She wants her errorHandler to return from
      // a fatal error and continue trying to parse, rather than throwing an exception.
      // Without the patch, that put us into an endless loop.
      //
      // %REVIEW% Is there a better way of doing this?
      // %REVIEW% Are there any other cases which need the safety net?
      //      (and if so do we care right now, or should we rewrite the XPath
      //      grammar engine and can fix it at that time?)
      try {

    nextToken();
    Expr();

    if (null != m_token)
    {
      String extraTokens = "";

      while (null != m_token)
      {
        extraTokens += "'" + m_token + "'";

        nextToken();

        if (null != m_token)
          extraTokens += ", ";
      }

      error(XPATHErrorResources.ER_EXTRA_ILLEGAL_TOKENS,
            new Object[]{ extraTokens });  //"Extra illegal tokens: "+extraTokens);
    }

  }
  catch (com.sun.org.apache.xpath.internal.XPathProcessorException e)
  {
        if(CONTINUE_AFTER_FATAL_ERROR.equals(e.getMessage()))
        {
              // What I _want_ to do is null out this XPath.
              // I doubt this has the desired effect, but I'm not sure what else to do.
              // %REVIEW%!!!
              initXPath(compiler, "/..",  namespaceContext);
        }
        else
              throw e;
  }

  compiler.shrink();
}
 

import com.sun.org.apache.xml.internal.utils.PrefixResolver; //导入依赖的package包/类
/**
 * Given an string, init an XPath object for pattern matches,
 * in order that a parse doesn't
 * have to be done each time the expression is evaluated.
 * @param compiler The XPath object to be initialized.
 * @param expression A String representing the XPath.
 * @param namespaceContext An object that is able to resolve prefixes in
 * the XPath to namespaces.
 *
 * @throws javax.xml.transform.TransformerException
 */
public void initMatchPattern(
        Compiler compiler, String expression, PrefixResolver namespaceContext)
          throws javax.xml.transform.TransformerException
{

  m_ops = compiler;
  m_namespaceContext = namespaceContext;
  m_functionTable = compiler.getFunctionTable();

  Lexer lexer = new Lexer(compiler, namespaceContext, this);

  lexer.tokenize(expression);

  m_ops.setOp(0, OpCodes.OP_MATCHPATTERN);
  m_ops.setOp(OpMap.MAPINDEX_LENGTH, 2);

  nextToken();
  Pattern();

  if (null != m_token)
  {
    String extraTokens = "";

    while (null != m_token)
    {
      extraTokens += "'" + m_token + "'";

      nextToken();

      if (null != m_token)
        extraTokens += ", ";
    }

    error(XPATHErrorResources.ER_EXTRA_ILLEGAL_TOKENS,
          new Object[]{ extraTokens });  //"Extra illegal tokens: "+extraTokens);
  }

  // Terminate for safety.
  m_ops.setOp(m_ops.getOp(OpMap.MAPINDEX_LENGTH), OpCodes.ENDOP);
  m_ops.setOp(OpMap.MAPINDEX_LENGTH, m_ops.getOp(OpMap.MAPINDEX_LENGTH)+1);

  m_ops.shrink();
}