Package org.eclipse.persistence.internal.jpa.parsing

Source Code of org.eclipse.persistence.internal.jpa.parsing.LiteralNode

/*******************************************************************************
* Copyright (c) 1998, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
*     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/ 
package org.eclipse.persistence.internal.jpa.parsing;

import org.eclipse.persistence.queries.ObjectLevelReadQuery;
import org.eclipse.persistence.queries.ReportQuery;

import org.eclipse.persistence.expressions.*;
import org.eclipse.persistence.internal.expressions.*;

/**
* INTERNAL
* <p><b>Purpose</b>: Superclass for literals (String, Integer, Float, Character, ...)
* <p><b>Responsibilities</b>:<ul>
* <li> Maintain the literal being represented
* <li> Print to a string
* <li> Answer if the node is completely built
* </ul>
*    @author Jon Driscoll and Joel Lucuik
*    @since TopLink 4.0
*/
public class LiteralNode extends Node {
    public java.lang.Object literal;

    /**
     * Return a new LiteralNode.
     */
    public LiteralNode() {
        super();
    }

    /**
     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            reportQuery.addAttribute("CONSTANT", generateExpression(context));
        }
       
    }

    /**
     * INTERNAL
     * Generate the a new EclipseLink ConstantExpression for this node.
     */
    public Expression generateExpression(GenerationContext context) {
        Expression whereClause = new ConstantExpression(getLiteral(), context.getBaseExpression());
        return whereClause;
    }

    /**
     * INTERNAL
     * Return the literal
     */
    public String getAsString() {
        return getLiteral().toString();
    }

    /**
     * Insert the method's description here.
     * Creation date: (12/21/00 10:51:48 AM)
     * @return java.lang.Object
     */
    public java.lang.Object getLiteral() {
        return literal;
    }

    /**
     * INTERNAL
     * Is this a literal node
     */
    public boolean isLiteralNode() {
        return true;
    }

    /**
     * Insert the method's description here.
     * Creation date: (12/21/00 10:51:48 AM)
     * @param newLiteral java.lang.Object
     */
    public void setLiteral(java.lang.Object newLiteral) {
        literal = newLiteral;
    }

    public String toString(int indent) {
        StringBuffer buffer = new StringBuffer();
        toStringIndent(indent, buffer);
        buffer.append(toStringDisplayName() + "[" + getLiteral() + "]");
        return buffer.toString();
    }
}
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