oracle.toplink.essentials.internal.parsing.DotNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.exceptions.EJBQLException;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.internal.expressions.*;
import oracle.toplink.essentials.mappings.DatabaseMapping;
import oracle.toplink.essentials.mappings.DirectToFieldMapping;
import oracle.toplink.essentials.queryframework.ObjectLevelReadQuery;
import oracle.toplink.essentials.queryframework.ReportQuery;
/**
* INTERNAL
* Purpose: This node represents an 'DOT' (i.e. '.') on the input
* stream. The left and right will depend on the input stream.
*
Responsibilities:
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class DotNode extends LogicalOperatorNode {
private Object enumConstant;
/**
* INTERNAL
* Apply this node to the passed query
*/
public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
if (theQuery.isReportQuery()){
ReportQuery reportQuery = (ReportQuery)theQuery;
reportQuery.addAttribute(resolveAttribute(), generateExpression(context));
reportQuery.dontRetrievePrimaryKeys();
}
}
/**
* INTERNAL
* Check the left child node for an unqualified field access. The method
* delegates to the left most expression of multi-navigation path
* expression.
*/
public Node qualifyAttributeAccess(ParseTreeContext context) {
if (getLeft() != null) {
setLeft(getLeft().qualifyAttributeAccess(context));
}
return this;
}
/**
* INTERNAL
* Validate node and calculate its type.
* Check for enum literals.
*/
public void validate(ParseTreeContext context) {
TypeHelper typeHelper = context.getTypeHelper();
String name = ((AttributeNode)right).getAttributeName();
// check for fully qualified type names
Node leftMost = getLeftMostNode();
if (isDeclaredVariable(leftMost, context)) {
left.validate(context);
checkNavigation(left, context);
Object type = typeHelper.resolveAttribute(left.getType(), name);
if (type == null) {
// could not resolve attribute
throw EJBQLException.unknownAttribute(
context.getQueryInfo(), right.getLine(), right.getColumn(),
name, typeHelper.getTypeName(left.getType()));
}
setType(type);
right.setType(type);
} else {
// Check for enum literal access
String typeName = left.getAsString();
Object type = resolveEnumTypeName(typeName, typeHelper);
if ((type != null) && typeHelper.isEnumType(type)) {
enumConstant = typeHelper.resolveEnumConstant(type, name);
if (enumConstant == null) {
throw EJBQLException.invalidEnumLiteral(context.getQueryInfo(),
right.getLine(), right.getColumn(), typeName, name);
}
} else {
// left most node is not an identification variable and
// dot expression doe not denote an enum literal access =>
// unknown identification variable
throw EJBQLException.aliasResolutionException(
context.getQueryInfo(), leftMost.getLine(),
leftMost.getColumn(), leftMost.getAsString());
}
setType(type);
right.setType(type);
}
}
/**
* INTERNAL
* Checks whether the left hand side of this dot node is navigable.
*/
private void checkNavigation(Node node, ParseTreeContext context) {
TypeHelper typeHelper = context.getTypeHelper();
// Checks whether the type of the dot node allows a navigation.
Object type = node.getType();
if (!typeHelper.isEntityClass(type) &&
!typeHelper.isEmbeddable(type) &&
!typeHelper.isEnumType(type)) {
throw EJBQLException.invalidNavigation(
context.getQueryInfo(), node.getLine(), node.getColumn(),
this.getAsString(), node.getAsString(),
typeHelper.getTypeName(type));
}
// Special check to disallow collection valued relationships
if (node.isDotNode()) {
Node left = node.getLeft();
AttributeNode right = (AttributeNode)node.getRight();
if (typeHelper.isCollectionValuedRelationship(
left.getType(), right.getAttributeName())) {
throw EJBQLException.invalidCollectionNavigation(
context.getQueryInfo(), right.getLine(), right.getColumn(),
this.getAsString(), right.getAttributeName());
}
}
}
/** */
private boolean isDeclaredVariable(Node node, ParseTreeContext context) {
if (node.isVariableNode()) {
String name = ((VariableNode)node).getCanonicalVariableName();
return context.isVariable(name);
}
return false;
}
/**
* INTERNAL
* Return a TopLink expression by getting the required variables using the
* left and right nodes
* "emp.address.city" = builder.get("address").get("city")
*/
public Expression generateExpression(GenerationContext context) {
Node left = getLeft();
Node right = getRight();
if (enumConstant != null) {
// enum literal access
return new ConstantExpression(enumConstant, new ExpressionBuilder());
} else {
// Get the left expression
Expression whereClause = left.generateExpression(context);
// Calculate the mapping and pass it to the right expression
if (right.isAttributeNode()) {
((AttributeNode)right).setMapping(resolveMapping(context));
}
// Or it with whatever the right expression is
whereClause = right.addToExpression(whereClause, context);
// and return the expression...
return whereClause;
}
}
/**
* INTERNAL
* Yes, this is a dot node
*/
public boolean isDotNode() {
return true;
}
/**
* INTERNAL
* ():
* Answer true if the SELECTed node has a left and right, and the right represents
* a direct-to-field mapping.
*/
public boolean endsWithDirectToField(GenerationContext context) {
DatabaseMapping mapping = resolveMapping(context);
return (mapping != null) && mapping.isDirectToFieldMapping();
}
/**
* INTERNAL
* Returns the attribute type if the right represents a direct-to-field mapping.
*/
public Class getTypeOfDirectToField(GenerationContext context) {
DatabaseMapping mapping = resolveMapping(context);
if ((mapping != null) && mapping.isDirectToFieldMapping()) {
return ((DirectToFieldMapping)mapping).getAttributeClassification();
}
return null;
}
/**
* INTERNAL
* ():
* Answer true if the node has a left and right, and the right represents
* a collection mapping.
*/
public boolean endsWithCollectionField(GenerationContext context) {
DatabaseMapping mapping = resolveMapping(context);
return (mapping != null) && mapping.isCollectionMapping();
}
/**
* INTERNAL
* Answer the name of the attribute which is represented by the receiver's
* right node.
*/
public String resolveAttribute() {
return ((AttributeNode)getRight()).getAttributeName();
}
/**
* INTERNAL
* Answer the mapping resulting from traversing the receiver's nodes
*/
public DatabaseMapping resolveMapping(GenerationContext context) {
Class leftClass = getLeft().resolveClass(context);
return getRight().resolveMapping(context, leftClass);
}
/**
* resolveClass: Answer the class which results from traversing the mappings for the receiver's nodes
*/
public Class resolveClass(GenerationContext context) {
Class leftClass = getLeft().resolveClass(context);
return getRight().resolveClass(context, leftClass);
}
/**
* INTERNAL
* Get the string representation of this node.
*/
public String getAsString() {
return left.getAsString() + "." + right.getAsString();
}
/**
* INTERNAL
* Return the left most node of a dot expr, so return 'a' for 'a.b.c'.
*/
private Node getLeftMostNode() {
return left.isDotNode() ? ((DotNode)left).getLeftMostNode() : left;
}
/**
* INTERNAL
* Returns the type representation for the specified type name. The method
* looks for inner classes if it cannot resolve the type name.
*/
private Object resolveEnumTypeName(String name, TypeHelper helper) {
Object type = helper.resolveTypeName(name);
if (type == null) {
// check for inner enum type
int index = name.lastIndexOf('.');
if (index != -1) {
name = name.substring(0, index) + '$' + name.substring(index+1);
type = helper.resolveTypeName(name);
}
}
return type;
}
}