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Hibernate's core ORM functionality
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.hql.internal.ast.tree;
import org.hibernate.hql.internal.antlr.HqlSqlTokenTypes;
import org.hibernate.internal.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import antlr.SemanticException;
import antlr.collections.AST;
/**
* 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 = CoreLogging.messageLogger( FromReferenceNode.class );
private FromElement fromElement;
private boolean resolved;
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 {
}
@Override
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() );
}
}
@Override
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();
}
@Override
public void resolveInFunctionCall(boolean generateJoin, boolean implicitJoin) throws SemanticException {
resolve( generateJoin, implicitJoin );
}
@Override
public void resolve(boolean generateJoin, boolean implicitJoin) throws SemanticException {
resolve( generateJoin, implicitJoin, null );
}
@Override
public void resolve(boolean generateJoin, boolean implicitJoin, String classAlias) throws SemanticException {
resolve( generateJoin, implicitJoin, classAlias, null );
}
public void resolve(boolean generateJoin, boolean implicitJoin, String classAlias, AST parent)
throws SemanticException {
resolve( generateJoin, implicitJoin, classAlias, parent, 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;
}
@SuppressWarnings("SimplifiableIfStatement")
protected boolean isFromElementUpdateOrDeleteRoot(FromElement element) {
if ( element.getFromClause().getParentFromClause() != null ) {
// its not even a root...
return false;
}
return getWalker().getStatementType() == HqlSqlTokenTypes.DELETE
|| getWalker().getStatementType() == HqlSqlTokenTypes.UPDATE;
}
}