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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */
// Copyright (c) 1998, 2007, Oracle. All rights reserved.  
package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.descriptors.ClassDescriptor;
import oracle.toplink.essentials.exceptions.EJBQLException;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.mappings.DatabaseMapping;

/**
 * INTERNAL
 * 

Purpose: Represent a attribute. * *

Responsibilities:

    *
*/ public class AttributeNode extends Node { /** The attribute name. */ private String name; /** Flag indicating outer join */ private boolean outerJoin; /** */ private boolean requiresCollectionAttribute; /** */ private DatabaseMapping mapping; /** * Create a new AttributeNode */ public AttributeNode() { super(); } /** * Create a new AttributeNode with the passed name * @param name the attribute name */ public AttributeNode(String name) { setAttributeName(name); } /** * INTERNAL * If called this AttributeNode represents an unqualified field access. * The method returns a DotNode representing a qualified field access with * the base variable as left child node and the attribute as right child * node. */ public Node qualifyAttributeAccess(ParseTreeContext context) { return (Node)context.getNodeFactory().newQualifiedAttribute( getLine(), getColumn(), context.getBaseVariable(), name); } /** * INTERNAL * Validate the current node and calculates its type. */ public void validate(ParseTreeContext context) { // The type is calculated in the parent DotNode. } /** */ public Expression addToExpression(Expression parentExpression, GenerationContext context) { if (isCollectionAttribute()) { //special case for NOT MEMBER OF if (context.hasMemberOfNode()) { return parentExpression.noneOf(name, new ExpressionBuilder().equal(context.getMemberOfNode().getLeftExpression())); } return outerJoin ? parentExpression.anyOfAllowingNone(name) : parentExpression.anyOf(name); } else { // check whether collection attribute is required if (requiresCollectionAttribute()) { throw EJBQLException.invalidCollectionMemberDecl( context.getParseTreeContext().getQueryInfo(), getLine(), getColumn(), name); } if (context.shouldUseOuterJoins() || isOuterJoin()) { return parentExpression.getAllowingNull(name); } else { return parentExpression.get(name); } } } /** * INTERNAL * Is this node an AttributeNode */ public boolean isAttributeNode() { return true; } /** */ public String getAttributeName() { return name; } /** */ public void setAttributeName(String name) { this.name = name; } /** */ public boolean isOuterJoin() { return outerJoin; } /** */ public void setOuterJoin(boolean outerJoin) { this.outerJoin = outerJoin; } /** */ public boolean requiresCollectionAttribute() { return requiresCollectionAttribute; } /** */ public void setRequiresCollectionAttribute(boolean requiresCollectionAttribute) { this.requiresCollectionAttribute = requiresCollectionAttribute; } /** */ public DatabaseMapping getMapping() { return mapping; } /** */ public void setMapping(DatabaseMapping mapping) { this.mapping = mapping; } /** */ public boolean isCollectionAttribute() { DatabaseMapping mapping = getMapping(); return (mapping != null) && mapping.isCollectionMapping(); } /** * resolveMapping: Answer the mapping which corresponds to my variableName. */ public DatabaseMapping resolveMapping(GenerationContext context, Class ownerClass) { ClassDescriptor descriptor = context.getSession().getDescriptor(ownerClass); return (descriptor==null) ? null : descriptor.getMappingForAttributeName(getAttributeName()); } /** * resolveClass: Answer the class for the mapping associated with the my variableName in the ownerClass. * Answer null if the node represents a mapping that doesn't exist */ public Class resolveClass(GenerationContext context, Class ownerClass) { DatabaseMapping mapping; mapping = resolveMapping(context, ownerClass); // if we are working with a direct-to-field, or the mapping's null, // return the owner class // Returning the ownerClass when the mapping is null delegates error handling // to the query rather than me if ((mapping == null) || (mapping.isDirectToFieldMapping())) { return ownerClass; } ClassDescriptor descriptor = mapping.getReferenceDescriptor(); return (descriptor==null) ? null : descriptor.getJavaClass(); //return mapping.getReferenceDescriptor().getJavaClass(); } public String toString(int indent) { StringBuffer buffer = new StringBuffer(); toStringIndent(indent, buffer); buffer.append(toStringDisplayName() + "[" + getAttributeName() + "]"); return buffer.toString(); } /** * INTERNAL * Get the string representation of this node. */ public String getAsString() { return getAttributeName(); } }




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