PaginatedExpressionImpl.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it).
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openspcoop2.generic_project.expression.impl;

import org.openspcoop2.generic_project.exception.ExpressionException;
import org.openspcoop2.generic_project.exception.ExpressionNotImplementedException;
import org.openspcoop2.generic_project.expression.IPaginatedExpression;
import org.openspcoop2.generic_project.expression.impl.formatter.IObjectFormatter;


/**
 * PaginatedExpressionImpl
 * 
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class PaginatedExpressionImpl extends ExpressionImpl implements IPaginatedExpression {

    public PaginatedExpressionImpl() throws ExpressionException {
        super();
    }
    public PaginatedExpressionImpl(IObjectFormatter objectFormatter) throws ExpressionException{
        super(objectFormatter);
    }
    public PaginatedExpressionImpl(ExpressionImpl expr) throws ExpressionException{
        super(expr);
    }
    
    private Integer limit = null;
    private Integer offset = null;
    
    /**
     * Sets the maximum number of results
     * 
     * @param limit maximum number of results 
     * @return the instance of itself
     * @throws ExpressionNotImplementedException Method not implemented
     * @throws ExpressionException Error Processing
     */
    @Override
    public IPaginatedExpression limit(int limit) throws ExpressionNotImplementedException,
            ExpressionException {
        this.limit = limit;
        return this;
    }

    /**
     * Set the offset from which to search
     * 
     * @param offset offset
     * @return the instance of itself
     * @throws ExpressionNotImplementedException Method not implemented
     * @throws ExpressionException Error Processing
     */
    @Override
    public IPaginatedExpression offset(int offset) throws ExpressionNotImplementedException,
            ExpressionException {
        this.offset = offset;
        return this;
    }

    public Integer getLimit() {
        return this.limit;
    }

    public Integer getOffset() {
        return this.offset;
    }



    
    /* ToString */
    @Override
    public String toString(){
        String s = super.toString(false);
        if(s==null){
            return s;
        }
        else{
            StringBuilder bf = new StringBuilder();
            bf.append(s);
            
            if(this.limit!=null && this.limit>=0){
                bf.append(" LIMIT "+this.limit);
            }
            
            if(this.offset!=null && this.offset>=0){
                bf.append(" OFFSET "+this.offset);
            }
            
            this.printForceIndex(bf);
            
            return bf.toString();
        }
    }
}