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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.hql.internal.ast.tree;
import antlr.SemanticException;
import antlr.collections.AST;
import org.jboss.logging.Logger;
import org.hibernate.internal.CoreMessageLogger;
/**
* Represents a reference to a FROM element, for example a class alias in a WHERE clause.
*
* @author josh
*/
public abstract class FromReferenceNode extends AbstractSelectExpression
implements ResolvableNode, DisplayableNode, InitializeableNode, PathNode {
private static final CoreMessageLogger LOG = Logger.getMessageLogger( CoreMessageLogger.class, FromReferenceNode.class.getName() );
private FromElement fromElement;
private boolean resolved = false;
public static final int ROOT_LEVEL = 0;
@Override
public FromElement getFromElement() {
return fromElement;
}
public void setFromElement(FromElement fromElement) {
this.fromElement = fromElement;
}
/**
* Resolves the left hand side of the DOT.
*
* @throws SemanticException
*/
public void resolveFirstChild() throws SemanticException {
}
public String getPath() {
return getOriginalText();
}
public boolean isResolved() {
return resolved;
}
public void setResolved() {
this.resolved = true;
if ( LOG.isDebugEnabled() ) {
LOG.debugf( "Resolved : %s -> %s", this.getPath(), this.getText() );
}
}
public String getDisplayText() {
StringBuilder buf = new StringBuilder();
buf.append( "{" ).append( ( fromElement == null ) ? "no fromElement" : fromElement.getDisplayText() );
buf.append( "}" );
return buf.toString();
}
public void recursiveResolve(int level, boolean impliedAtRoot, String classAlias) throws SemanticException {
recursiveResolve( level, impliedAtRoot, classAlias, this );
}
public void recursiveResolve(int level, boolean impliedAtRoot, String classAlias, AST parent) throws SemanticException {
AST lhs = getFirstChild();
int nextLevel = level + 1;
if ( lhs != null ) {
FromReferenceNode n = ( FromReferenceNode ) lhs;
n.recursiveResolve( nextLevel, impliedAtRoot, null, this );
}
resolveFirstChild();
boolean impliedJoin = true;
if ( level == ROOT_LEVEL && !impliedAtRoot ) {
impliedJoin = false;
}
resolve( true, impliedJoin, classAlias, parent );
}
@Override
public boolean isReturnableEntity() throws SemanticException {
return !isScalar() && fromElement.isEntity();
}
public void resolveInFunctionCall(boolean generateJoin, boolean implicitJoin) throws SemanticException {
resolve( generateJoin, implicitJoin );
}
public void resolve(boolean generateJoin, boolean implicitJoin) throws SemanticException {
resolve( generateJoin, implicitJoin, null );
}
public void resolve(boolean generateJoin, boolean implicitJoin, String classAlias) throws SemanticException {
resolve( generateJoin, implicitJoin, classAlias, null );
}
public void prepareForDot(String propertyName) throws SemanticException {
}
/**
* Sub-classes can override this method if they produce implied joins (e.g. DotNode).
*
* @return an implied join created by this from reference.
*/
public FromElement getImpliedJoin() {
return null;
}
}