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Explore the source code of the class JRBaseDataRange.java

/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2016 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports 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 JasperReports. If not, see .
 */
package net.sf.jasperreports.charts.base;

import java.io.Serializable;

import net.sf.jasperreports.charts.JRDataRange;
import net.sf.jasperreports.engine.JRConstants;
import net.sf.jasperreports.engine.JRExpression;
import net.sf.jasperreports.engine.JRExpressionCollector;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.base.JRBaseObjectFactory;
import net.sf.jasperreports.engine.util.JRCloneUtils;

/**
 * An immutable instantiation of a {@link net.sf.jasperreports.charts.JRDataRange JRDataRange}, suitable for holding
 * a range.
 *
 * @author Barry Klawans ([email protected])
 */
public class JRBaseDataRange implements JRDataRange, Serializable
{
	/**
	 *
	 */
	private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;

	/**
	 * The expression used to calculate the lower bound of the range.
	 */
	protected JRExpression lowExpression;

	/**
	 * The expression used to calculate the upper bound of the range.
	 */
	protected JRExpression highExpression;


	/**
	 * Constructs a copy of an existing range.
	 *
	 * @param dataRange the range to copy
	 */
	public JRBaseDataRange(JRDataRange dataRange)
	{
		if (dataRange != null)
		{
			this.lowExpression = dataRange.getLowExpression();
			this.highExpression = dataRange.getHighExpression();
		}
}

	/**
	 * Creates a copy of an existing range and registers all of the expressions
	 * with a factory object.  Once the expressions have been registered they will
	 * be included when the report is compiled.
	 *
	 * @param dataRange the range to copy
	 * @param factory the factory to register the expressions with
	 */
	public JRBaseDataRange(JRDataRange dataRange, JRBaseObjectFactory factory)
	{
		factory.put(dataRange, this);

		lowExpression = factory.getExpression(dataRange.getLowExpression());
		highExpression = factory.getExpression(dataRange.getHighExpression());
	}


	@Override
	public JRExpression getLowExpression()
	{
		return lowExpression;
	}
	@Override
	public JRExpression getHighExpression()
	{
		return highExpression;
	}


	/**
	 * Registers all of the expressions with the collector.  If the expressions
	 * have been registered with one of the report's factory they will be included
	 * when the report is compiled.
	 *
	 * @param collector the expression collector to use
	 */
	public void collectExpressions(JRExpressionCollector collector)
	{
		collector.collect(this);
	}

	@Override
	public Object clone() 
	{
		JRBaseDataRange clone = null;
		
		try
		{
			clone = (JRBaseDataRange)super.clone();
		}
		catch (CloneNotSupportedException e)
		{
			throw new JRRuntimeException(e);
		}

		clone.lowExpression = JRCloneUtils.nullSafeClone(lowExpression);
		clone.highExpression = JRCloneUtils.nullSafeClone(highExpression);
		
		return clone;
	}
}