Java Expression类代码示例

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
private boolean isUpdatingExpression(Expression ex) {
//logger.trace("isUpdatingExpression; got ex: {}; {}", ex.getClass().getName(), ex);
  	if (ex.isUpdatingExpression()) {
  		logger.debug("isUpdatingExpression; got updating ex: {}", ex);
  		return true;
  	}
  	if (ex instanceof IntegratedFunctionCall) {
  		String qName = ex.getExpressionName();
  		if (bg_remove_document.equals(qName) || bg_remove_cln_documents.equals(qName) || bg_store_document.equals(qName)) {
      		logger.trace("isUpdatingExpression; got updating UDF: {}", qName);
  			return true;
  		}
  	} else if (ex instanceof UserFunctionCall) {
  		UserFunctionCall ufc = (UserFunctionCall) ex;
  		ex = ufc.getFunction().getBody();
  	}  
  	
  	Iterator<Operand> itr = ex.operands().iterator();
  	while(itr.hasNext()) {
  		Expression e = itr.next().getChildExpression(); 
  		if (isUpdatingExpression(e)) {
  			return true;
  		}
  	}
  	return false;
  }
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public RunInstruction(Expression command, int timeout, List args) 
{
  this.command = command;
  this.timeout = timeout;

  nArgs = args.size();

  if (args.size() > 0 &&
      args.get(args.size() - 1) instanceof InputElement.InputInstruction) 
  {
    inputExpr = (InputElement.InputInstruction)args.get(args.size() - 1);
    --nArgs;
  }

  Expression[] sub = new Expression[args.size()];
  for (int i = 0; i < args.size(); i++)
    sub[i] = (Expression)args.get(i);
  setArguments(sub);
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
/**
 * Replace one subexpression by a replacement subexpression
 * @param original the original subexpression
 * @param replacement the replacement subexpression
 * @return true if the original subexpression is found
 */

public boolean replaceSubExpression(Expression original, Expression replacement) 
{
    boolean found = false;
    for (Entry<String, Expression> attrib : attribs.entrySet()) {
      Expression exp = attrib.getValue();
      if (exp == original) {
        attrib.setValue(replacement);
        found = true;
      }
    }
    if (content == original) {
        content = replacement;
        found = true;
    }
    return found;
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
/**
 * Calculates a string name for a given set of xsl:key definitions. This
 * is done very carefully to ensure that the same key will generate the
 * same name, regardless of ephemeral things like particular name codes
 * or other variables that might be different on a different run.
 *
 * @param pool          Name pool used to look up names
 * @param fingerName    Fingerprint of the key
 * @param definitions   List of key definitions
 * @param config        Associated Saxon configuration
 *
 * @return              A unique string for this xsl:key
 */
private String calcIndexName(NamePool pool, 
                             String fingerName,
                             List definitions,
                             Configuration config) 
{
  StringBuffer sbuf = new StringBuffer();
  sbuf.append("key|" + fingerName);
  for (int k = 0; k < definitions.size(); k++) 
  {
    KeyDefinition def = (KeyDefinition)definitions.get(k);

    // Capture the match pattern.
    String matchStr = def.getMatch().toString();
    sbuf.append("|" + Long.toString(Hash64.hash(matchStr), 16));
    
    // Capture the 'use' expression
    if (def.getUse() instanceof Expression) 
    {
      // Saxon likes to dump debug stuff to a PrintStream, and we need to
      // capture to a buffer.
      //
      ByteArrayOutputStream bytes = new ByteArrayOutputStream();
      PrintStream ps = new PrintStream(bytes);
      
      ((Expression)def.getUse()).display(10, ps, config);
      ps.flush();
      String useStr = bytes.toString();
      sbuf.append("|" + Long.toString(Hash64.hash(useStr), 16));
    }
    else
      sbuf.append("|non-exp");
  } // for k

  return sbuf.toString();
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public Optional<Variable> eval(String expressionString) {
    QueryModule evaluatedModule = getModule();
    StaticContext wrappingContext = wrapContext(evaluatedModule);
    if (wrappingContext != null) {
        try {
            Expression expression = ExpressionTool.make(expressionString, wrappingContext, 0, Token.EOF, null);
            final ExpressionVisitor visitor = ExpressionVisitor.make(wrappingContext);
            expression = expression.typeCheck(visitor, new ContextItemStaticInfo(Type.ITEM_TYPE, true));
            SlotManager stackFrameMap = xPathContext.getStackFrame().getStackFrameMap();
            final int variables = stackFrameMap.getNumberOfVariables();
            ExpressionTool.allocateSlots(expression, variables, stackFrameMap);
            final SequenceIterator it = expression.iterate(xPathContext);
            String[] sequenceValue = SaxonItemConverter.getSequenceValue(it);
            if (sequenceValue != null) {
                return Optional.of(new Variable("evalResult", sequenceValue[1], sequenceValue[0]));
            } else {
                return Optional.empty();
            }
        } catch (AssertionError | Exception e) {
            System.err.println("Unable to evaluate: '" + expressionString + "'");
            e.printStackTrace();
            return Optional.empty();
        }
    }
    return Optional.empty();
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
@Override
public Expression inject(Expression expression, StaticContext staticContext, int construct, StructuredQName qName) {
    log("injecting trace for =" + expression.getClass() + " line: " + expression.getLocation().getLineNumber() + " construct: " + construct + " module: " + staticContext.getSystemId());
    TraceExpression trace = new TraceExpression(expression);
    trace.setNamespaceResolver(staticContext.getNamespaceResolver());
    trace.setConstructType(construct);
    trace.setObjectName(qName);
    return trace;
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
@Override
  public Expression compile(Compilation exec, ComponentDeclaration decl) throws XPathException {

if (select == null) {
	select = compileSequenceConstructor(exec, decl, iterateAxis(AxisInfo.CHILD), false);
}

      return new TestInstruction(select);
  }
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
@Override
  public Expression compile(Compilation exec, ComponentDeclaration decl) throws XPathException {
if (html == null) {
	html = compileSequenceConstructor(exec, decl, iterateAxis(AxisInfo.CHILD), false);
}
	
      return new HtmlDialogInstruction(title, size, html, propertiesKey, buttons, blockParent, cssRules, cssUri, resizable);
  }
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public HtmlDialogInstruction(	Expression title, 
     								Expression size, 
     								Expression html, 
     								Expression properties, 
     								Expression buttons, 
     								Expression blockParent,
     								Expression cssRules,
     								Expression cssUri,
     								Expression resizable) {
     	//logger.info("HtmlDialogInstruction: " + title + ", " + size + ", " + html + ", " + properties + ", " + buttons);
Expression[] subs = {title, size, html, properties, buttons, blockParent, cssRules, cssUri, resizable};
     	setArguments(subs);
     }
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
private void setParentPath(ExpressionBuilder eb, int exIndex, PathBuilder path) {
	com.bagri.core.query.Expression ex = eb.getExpression(exIndex);
	if (ex != null) {
		path.setPath(ex.getPath());
		logger.trace("iterate; path switched to: {}; from index: {}", path, exIndex);
	}
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public Expression compile(Executable exec)
  throws XPathException 
{
  InputInstruction inst = new InputInstruction();
  initializeInstruction(exec, inst);
  return inst;
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public Expression compile(Executable exec)
  throws XPathException 
{
  ArgInstruction inst = new ArgInstruction();
  initializeInstruction(exec, inst);
  return inst;
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public Expression compile(Executable exec)
  throws XPathException 
{
  QueryInstruction inst = new QueryInstruction(connection,
                                               column,
                                               table,
                                               where,
                                               rowTag,
                                               colTag,
                                               disable);
  return inst;
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public QueryInstruction(Expression connection, Expression column,
                        Expression table, Expression where, String rowTag,
                        String colTag, boolean disable) 
{
  Expression[] sub = { connection, column, table, where };
  setArguments(sub);
  this.rowTag = rowTag;
  this.colTag = colTag;
  this.options = (disable ? ReceiverOptions.DISABLE_ESCAPING : 0);
}
 

import net.sf.saxon.expr.Expression; //导入依赖的package包/类
public Expression compile(Executable exec)
  throws XPathException 
{
  return new ConnectInstruction(database,
                                driver,
                                user,
                                password,
                                getPropertyInstructions(exec));
}