Java Token.STRING属性代码示例

public static boolean isTrivial (String formula) {
	// No formulas, just one constant or one variable.
	final ArrayList<AstNode> result = new ArrayList<AstNode>();
	parseIntoTree(formula).visit(new NodeVisitor(){

		@Override
		public boolean visit(AstNode node) {
			if(node.depth()>1){
				result.add(node);
				return false;
			}
			return true;
		}
		
	});
	if(result.size()>0){
		switch (result.get(0).getType()) {
			case Token.NUMBER: return true;
			case Token.NAME: return true;
			case Token.STRING: return true;
			default: return false;
		}
	}
	return false;
}
 

/**
 * 
 * @param n
 * @param objectName
 * @return
 */
private static String getScriptObjectName( Node n, String objectName )
{
	if ( n == null )
		return null;
	String result = null;
	if ( n.getType( ) == Token.NAME )
	{
		if ( objectName.equals( n.getString( ) ) )
		{
			Node dimNameNode = n.getNext( );
			if ( dimNameNode == null
					|| dimNameNode.getType( ) != Token.STRING )
				return null;

			return dimNameNode.getString( );
		}
	}

	result = getScriptObjectName( n.getFirstChild( ), objectName );
	if ( result == null )
		result = getScriptObjectName( n.getLastChild( ), objectName );

	return result;
}
 

/**
 * Return the Constant Expression referred by the total constants.
 * @param child
 * @return
 */
public static ConstantExpression getConstantExpression( Node child )
{
	if ( child.getFirstChild( ).getType( ) == Token.NAME
		&& child.getFirstChild( ).getString( ).equalsIgnoreCase( TOTAL )
		&& child.getLastChild( ).getType( ) == Token.STRING )
	{
		String property = child.getLastChild( ).getString( );
		if ( CURRENT_GROUP.equalsIgnoreCase( property )
			|| OVERALL.equalsIgnoreCase( property ) )
			return new ConstantExpression( property.toUpperCase( ) );
		if ( NO_FILTER.equalsIgnoreCase( property ) )
			return new ConstantExpression();
	}
	return null;
}
 

/**
 * compile outer column expression
 * @param refNode
 * @param tree
 * @param columnExprList
 * @throws BirtException
 */
private void compileOuterColRef( Node refNode, ScriptNode tree,
		List columnExprList ) throws BirtException
{
	int level = compileOuterColRefExpr( refNode );
	if ( level == -1 )
	{
		compileComplexExpr( refNode, tree, columnExprList );
	}
	else
	{
		Node nextNode = refNode.getLastChild( );
		if ( nextNode.getType( ) == Token.STRING )
		{
			ColumnBinding info = new ColumnBinding( nextNode.getString( ),
					"",
					level );
			columnExprList.add( info );
		}
	}
	return;
}
 

/**
 * 
 * @param n
 * @param objectName
 * @return
 */
private static void getScriptObjectName( Node n, String objectName, Set nameSet )
{
	if ( n == null )
		return;
	String result = null;
	if ( n.getType( ) == Token.NAME )
	{
		if ( objectName.equals( n.getString( ) ) )
		{
			Node dimNameNode = n.getNext( );
			if ( dimNameNode == null
					|| dimNameNode.getType( ) != Token.STRING )
				return;

			nameSet.add( dimNameNode.getString( ) );
		}
	}

	getScriptObjectName( n.getFirstChild( ), objectName, nameSet );
	getScriptObjectName( n.getNext( ), objectName, nameSet );
	getScriptObjectName( n.getLastChild( ), objectName, nameSet );
}
 

@Override
public boolean visit(AstNode node) {
	switch (node.getType()) {
	case Token.GETPROP: // foo.bar (firstChild="foo", lastChild="bar")
		PropertyGet propertyGet = (PropertyGet)node;
		int propType = propertyGet.getProperty().getType();
		if(propertyGet.getTarget().getType()==Token.NAME
				&& (propType == Token.STRING || propType == Token.NAME)
				&& objectName.equals(safeGetString(propertyGet.getTarget()))
		){
			resultSoFar.add(safeGetString(propertyGet.getProperty()));
		}
		break;
	case Token.GETELEM: // foo["bar"]
		ElementGet elemGet = (ElementGet)node;
		int elemType = elemGet.getElement().getType();
		if(elemGet.getTarget().getType()==Token.NAME
			&&  (elemType == Token.STRING || elemType==Token.NAME)
			&& objectName.equals(safeGetString(elemGet.getTarget()))
		){
			resultSoFar.add(safeGetString(elemGet.getElement()));
		}
		break;
	default:
		break;
	}
	return true;
}
 

protected static String safeGetString(AstNode node){
	if(node.getType() == Token.STRING){
		StringLiteral sl = (StringLiteral)node;
		return sl.getValue();
	}else if(node.getType()==Token.NUMBER){
		NumberLiteral nl = (NumberLiteral)node;
		return nl.getValue();
	}else{
		return node.getString();
	}
}
 

/**
 * 
 * @param n
 * @param objectName
 * @return
 */
private static String getScriptObjectName( Node n, String objectName )
{
	if ( n == null )
		return null;
	String result = null;
	if ( n.getType( ) == Token.NAME )
	{
		if ( objectName.equals( n.getString( ) ) )
		{
			Node dimNameNode = n.getNext( );
			if ( dimNameNode == null
					|| dimNameNode.getType( ) != Token.STRING )
				return null;

			return dimNameNode.getString( );
		}
	}

	result = getScriptObjectName( n.getFirstChild( ), objectName );
	if ( result == null )
		result = getScriptObjectName( n.getLastChild( ), objectName );
	
	if ( result == null )
		result = getScriptObjectName( n.getNext(), objectName );

	return result;
}
 

/**
 * An aggregation expression in the form of Total.xxx for example Total.sum(
 * row.x ) This means the first child is a GETPROP node, and its left child
 * is "Total" and its right child is "sum"
 * 
 * @param callNode
 * @return @throws
 *         DataException
 */
protected IAggrFunction getAggregationFunction( Node callNode )
		throws DataException
{

	Node firstChild = callNode.getFirstChild( );
	if ( firstChild.getType( ) != Token.GETPROP )
		return null;

	Node getPropLeftChild = firstChild.getFirstChild( );
	if ( getPropLeftChild.getType( ) != Token.NAME
			|| !getPropLeftChild.getString( ).equals( TOTAL ) )
		return null;

	Node getPropRightChild = firstChild.getLastChild( );
	if ( getPropRightChild.getType( ) != Token.STRING )
		return null;

	String aggrFuncName = getPropRightChild.getString( );
	IAggrFunction agg = AggregationManager.getInstance( )
			.getAggregation( aggrFuncName );
	if ( agg == null )
	{
		// Aggr function name after Total is invalid; this will eventuall
		// cause
		// an error. Report error now
		throw new DataException( ResourceConstants.INVALID_TOTAL_NAME,
				aggrFuncName );
	}
	return agg;
}
 

/**
 * if the Node is row Node, return true
 * 
 * @param refNode
 * @return
 */
private static boolean getDirectColRefExpr( Node refNode, boolean mode )
{
	assert ( refNode.getType( ) == Token.GETPROP || refNode.getType( ) == Token.GETELEM );

	Node rowName = refNode.getFirstChild( );
	assert ( rowName != null );
	if ( rowName.getType( ) != Token.NAME )
		return false;

	String str = rowName.getString( );
	assert ( str != null );
	if ( mode && !str.equals( STRING_ROW ) )
		return false;
	else if ( !mode && !str.equals( STRING_DATASET_ROW ) )
		return false;

	Node rowColumn = rowName.getNext( );
	assert ( rowColumn != null );

	if ( refNode.getType( ) == Token.GETPROP
			&& rowColumn.getType( ) == Token.STRING )
	{
		return true;
	}
	else if ( refNode.getType( ) == Token.GETELEM )
	{
		if ( rowColumn.getType( ) == Token.NUMBER
				|| rowColumn.getType( ) == Token.STRING )
			return true;
	}

	return false;
}
 

/**
 * if the Node is row Node, return true
 * 
 * @param refNode
 * @return
 */
private static boolean getDirectColRefExpr( Node refNode )
{
	assert ( refNode.getType( ) == Token.GETPROP || refNode.getType( ) == Token.GETELEM );

	Node rowName = refNode.getFirstChild( );
	assert ( rowName != null );
	if ( rowName.getType( ) != Token.NAME )
		return false;

	String str = rowName.getString( );
	assert ( str != null );
	if ( !str.equals( STRING_ROW ) )
		return false;

	Node rowColumn = rowName.getNext( );
	assert ( rowColumn != null );

	if ( refNode.getType( ) == Token.GETPROP
			&& rowColumn.getType( ) == Token.STRING )
	{
		return true;
	}
	else if ( refNode.getType( ) == Token.GETELEM )
	{
		if ( rowColumn.getType( ) == Token.NUMBER
				|| rowColumn.getType( ) == Token.STRING )
			return true;
	}

	return false;
}
 

/**
 * process child node
 * 
 * @param parent
 * @param child
 * @param tree
 * @param columnExprList
 * @throws BirtException
 */
private void processChild( Node child, ScriptNode tree,
		List columnExprList ) throws BirtException
{
	switch ( child.getType( ) )
	{
		case Token.NUMBER :
		case Token.STRING :
		case Token.NULL :
		case Token.TRUE :
		case Token.FALSE :
			break;

		case Token.GETPROP :
		case Token.GETELEM :
		case Token.SETPROP :
		case Token.SETELEM :
		{
			compileDirectColRefExpr( child, tree, columnExprList );
			break;
		}
		case Token.CALL :
			compileAggregateExpr( child, tree, columnExprList );
			break;
		default :
			compileComplexExpr( child, tree, columnExprList );
	}

}
 

/**
 * compile row position expression
 * @param refNode
 * @param tree
 * @param columnExprList
 * @throws BirtException
 */
private void compileRowPositionRef( Node refNode, ScriptNode tree,
		List columnExprList ) throws BirtException
{
	Node rowFirstNode = refNode.getFirstChild( );

	if ( rowFirstNode.getType( ) == Token.GETELEM
			|| rowFirstNode.getType( ) == Token.SETELEM )
	{
		Node rowNode = rowFirstNode.getFirstChild( );
		if ( rowNode != null
				&& rowNode.getType( ) == Token.NAME
				&& rowNode.getString( ).equals( ROWS_0_INDICATOR ) )
		{
			Node rowColumn = rowNode.getNext( );
			if ( rowColumn.getDouble( ) == 0.0 )
			{
				rowColumn = rowFirstNode.getNext( );
				if ( rowColumn.getType( ) == Token.STRING
						&& ( refNode.getType( ) == Token.GETELEM || refNode.getType( ) == Token.SETELEM ) )
				{
					ColumnBinding binding = new ColumnBinding( rowColumn.getString( ),
							ExpressionUtil.createJSDataSetRowExpression( rowColumn.getString( ) ),
							1 );
					columnExprList.add( binding );;
				}
			}
		}
	}
}
 

/**
 * compile the complex expression
 * 
 * @param complexNode
 * @throws BirtException
 */
private void compileComplexExpr( Node complexNode, ScriptNode tree,
		List columnExprList ) throws BirtException
{
	Node child = complexNode.getFirstChild( );
	while ( child != null )
	{
		if ( child.getType( ) == Token.FUNCTION )
		{
			int index = getFunctionIndex( child.getString( ), tree );
			compileFunctionNode( tree.getFunctionNode( index ),
					tree,
					columnExprList );
		}
		// keep reference to next child, since subsequent steps could
		// lose
		// the reference to it
		Node nextChild = child.getNext( );

		// do not include constants into the sub-expression list
		if ( child.getType( ) == Token.NUMBER
				|| child.getType( ) == Token.STRING
				|| child.getType( ) == Token.TRUE
				|| child.getType( ) == Token.FALSE
				|| child.getType( ) == Token.NULL )
		{
			processChild( child, tree, columnExprList );
			child = nextChild;
			continue;
		}

		processChild( child, tree, columnExprList );
		child = nextChild;
	}
}
 

protected static Set<String> findFeaturePathsUnder(Node node, List<String> pathSoFar) {
	Set<String> resultSoFar = new TreeSet<String>();
	switch (node.getType()) {
	case Token.NAME: // e.g. the x in x + 42
		if (pathSoFar != null) {
			pathSoFar.add(node.getString());
		} else {
			resultSoFar.add(node.getString());
		}
		break;
	case Token.STRING:
		if (pathSoFar != null) {
			pathSoFar.add(node.getString());
		}
		break;
	case Token.GETPROP: // e.g. foo.bar
		boolean topLevel = pathSoFar == null;
		if (topLevel) {
			pathSoFar = new ArrayList<String>();
		}
		for (Node child = node.getFirstChild(); child != null; child = child.getNext()) {
			resultSoFar.addAll(findFeaturePathsUnder(child, pathSoFar));
		}
		if (topLevel) {
			resultSoFar.add(getPathString(pathSoFar));
		}
		return resultSoFar;
	case Token.SETNAME: // Left-hand variable being written:  x in x = y;
	case Token.VAR:
	case Token.CALL:
		// ignore the left side and process the right side now
		resultSoFar.addAll(findFeaturePathsWithinRightSide(node));
		break;
	default:
		break;
	}
	// Now do the nested subexpressions, for all cases that said break instead of return.
	for (Node child = node.getFirstChild(); child != null; child = child.getNext()) {
		resultSoFar.addAll(findFeaturePathsUnder(child, pathSoFar));
	}
	return resultSoFar;
}