Examples of org.datanucleus.query.node.Node

org.datanucleus.query.node.Node
Representation of a node in a tree of nodes. Has a parent, and a list of children. Each node has a type and a value. Optionally has a set of properties; these represent arguments when part of a method call.

     */
    public Node parse(String expression)
    {
        p = new Lexer(expression, paramPrefixes, true);
        stack = new Stack();
        Node result = processExpression();


        if (p.ci.getIndex() != p.ci.getEndIndex())
        {
            // Error occurred in the JDOQL processing due to syntax error(s)
            String unparsed = p.getInput().substring(p.ci.getIndex());

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        }
        if (!processIdentifier())
        {
            throw new QueryCompilerSyntaxException("expected identifier", p.getIndex(), p.getInput());
        }
        Node nodeVariable = stack.pop();
        Node nodeType = stack.pop();
        nodeType.appendChildNode(nodeVariable);
        return nodeType;
    }

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    private Node[] processFromExpression()
    {
        // "candidate [AS] alias"
        // This will create a node of type "Node.CLASS" and child of type "Node.NAME" (alias)
        processExpression();
        Node id = stack.pop();
        StringBuilder className = new StringBuilder(id.getNodeValue().toString());
        while (id.getChildNodes().size() > 0)
        {
            id = id.getFirstChild();
            className.append(".").append(id.getNodeValue().toString());
        }


        String alias = p.parseIdentifier();
        if (alias != null && alias.equalsIgnoreCase("AS"))
        {
            alias = p.parseIdentifier();
        }
        if (alias == null)
        {
            alias = "this";
        }


        // Create candidate class node with alias, and put at top of stack
        Node classNode = new Node(NodeType.CLASS, className.toString());
        Node aliasNode = new Node(NodeType.NAME, alias);
        classNode.insertChildNode(aliasNode);
        stack.push(classNode);


        return new Node[] {classNode};
    }

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        stack = new Stack();
        List nodes = new ArrayList();
        do
        {
            processExpression();
            Node expr = stack.pop();


            String alias = p.parseIdentifier();
            if (alias != null && alias.equalsIgnoreCase("AS"))
            {
                alias = p.parseIdentifier();
            }
            if (alias != null)
            {
                Node aliasNode = new Node(NodeType.NAME, alias);
                expr.appendChildNode(aliasNode);
            }


            nodes.add(expr);
        }

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        stack = new Stack();
        List nodes = new ArrayList();
        do
        {
            processExpression();
            Node expr = stack.pop();
            nodes.add(expr);
        }
        while (p.parseString(","));
        return (Node[])nodes.toArray(new Node[nodes.size()]);
    }

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            {
                throw new QueryCompilerSyntaxException("Parsing variable list and expected variable name",
                    p.getIndex(), p.getInput());
            }


            Node nodeVariable = stack.pop();
            String varName = (String)nodeVariable.getNodeValue();
            if (!JDOQLQueryHelper.isValidJavaIdentifierForJDOQL(varName))
            {
                throw new NucleusUserException(LOCALISER.msg("021105",varName));
            }


            Node nodeType = stack.pop();
            nodes.add(new Node[]{nodeType, nodeVariable});
        }
        while (p.parseString(";"));
        return (Node[][]) nodes.toArray(new Node[nodes.size()][2]);
    }

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            {
                throw new QueryCompilerSyntaxException(LOCALISER.msg("021101", expression));
            }
            String classDecl = subTokeniser.nextToken();
            String parameterName = subTokeniser.nextToken();
            Node declNode = new Node(NodeType.IDENTIFIER, classDecl);
            Node nameNode = new Node(NodeType.IDENTIFIER, parameterName);
            nodes.add(new Node[]{declNode, nameNode});
        }


        return (Node[][]) nodes.toArray(new Node[nodes.size()][2]);
    }

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        {
            processExpression();
            if (p.parseString("ascending") || p.parseString("asc") ||
                p.parseString("ASCENDING") || p.parseString("ASC"))
            {
                Node expr = new Node(NodeType.OPERATOR, "ascending");
                stack.push(expr);
            }
            else if (p.parseString("descending") || p.parseString("desc") ||
                     p.parseString("DESCENDING") || p.parseString("DESC"))
            {
                Node expr = new Node(NodeType.OPERATOR, "descending");
                stack.push(expr);
            }
            else
            {
                // Default to ascending
                Node expr = new Node(NodeType.OPERATOR, "ascending");
                stack.push(expr);
            }
            Node expr = new Node(NodeType.OPERATOR, "order");
            expr.insertChildNode(stack.pop());
            if (!stack.empty())
            {
                expr.insertChildNode(stack.pop());
            }
            nodes.add(expr);
        }
        while (p.parseChar(','));

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        processConditionalAndExpression();


        while (p.parseString("||"))
        {
            processConditionalAndExpression();
            Node expr = new Node(NodeType.OPERATOR, "||");
            expr.insertChildNode(stack.pop());
            expr.insertChildNode(stack.pop());
            stack.push(expr);
        }
    }

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        processInclusiveOrExpression();


        while (p.parseString("&&"))
        {
            processInclusiveOrExpression();
            Node expr = new Node(NodeType.OPERATOR, "&&");
            expr.insertChildNode(stack.pop());
            expr.insertChildNode(stack.pop());
            stack.push(expr);
        }
    }

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Related Classes of org.datanucleus.query.node.Node

org.datanucleus.query.compiler.JavaQueryCompiler

org.datanucleus.query.compiler.JDOQLParser

org.datanucleus.query.compiler.JPQLParser

org.datanucleus.query.compiler.SQLParser

org.datanucleus.query.expression.ExpressionCompiler

java.util.ArrayList

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