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Hibernate example source code file (FromReferenceNode.java)

This example Hibernate source code file (FromReferenceNode.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

ast, coremessagelogger, fromelement, fromelement, fromreferencenode, fromreferencenode, log, override, root_level, semanticexception, semanticexception, string, string, stringbuffer

The Hibernate FromReferenceNode.java source code

/*
 * 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 org.hibernate.internal.CoreMessageLogger;

import org.jboss.logging.Logger;
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 = 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;
        LOG.debugf("Resolved : %s -> %s", this.getPath(), this.getText());
	}

	public String getDisplayText() {
		StringBuffer buf = new StringBuffer();
		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;
	}

}

Other Hibernate examples (source code examples)

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