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JasperReports Library
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/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2014 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.web.util;

import java.awt.Dimension;
import java.io.IOException;
import java.util.Collections;
import java.util.List;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRPrintImage;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.JRWrappingSvgRenderer;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.engine.Renderable;
import net.sf.jasperreports.engine.RenderableUtil;
import net.sf.jasperreports.engine.export.HtmlExporter;
import net.sf.jasperreports.engine.type.ImageTypeEnum;
import net.sf.jasperreports.engine.type.ModeEnum;
import net.sf.jasperreports.engine.type.RenderableTypeEnum;
import net.sf.jasperreports.web.WebReportContext;
import net.sf.jasperreports.web.servlets.JasperPrintAccessor;


/**
 * @author Teodor Danciu ([email protected])
 */
public class ImageWebResourceHandler implements WebResourceHandler
{
	/**
	 *
	 */
	public static final String REQUEST_PARAMETER_IMAGE_NAME = "image";

			
	/**
	 *
	 */
	public boolean handleResource(JasperReportsContext jasperReportsContext, HttpServletRequest request, HttpServletResponse response)
	{
		String imageName = request.getParameter(REQUEST_PARAMETER_IMAGE_NAME);
		if (imageName == null)
		{
			return false;
		}

		byte[] imageData = null;
		String imageMimeType = null;

		if ("px".equals(imageName))
		{
			try
			{
				Renderable pxRenderer = 
					RenderableUtil.getInstance(jasperReportsContext).getRenderable("net/sf/jasperreports/engine/images/pixel.GIF");
				imageData = pxRenderer.getImageData(jasperReportsContext);
				imageMimeType = ImageTypeEnum.GIF.getMimeType();
			}
			catch (JRException e)
			{
				throw new JRRuntimeException(e);
			}
		}
		else
		{
			WebReportContext webReportContext = WebReportContext.getInstance(request, false);
			
			if (webReportContext == null)
			{
				throw new JRRuntimeException("No web report context found.");
			}
			
			JasperPrintAccessor jasperPrintAccessor = (JasperPrintAccessor) webReportContext.getParameterValue(
					WebReportContext.REPORT_CONTEXT_PARAMETER_JASPER_PRINT_ACCESSOR);
			if (jasperPrintAccessor == null)
			{
				throw new JRRuntimeException("No JasperPrint found in report context.");
			}
			
			List jasperPrintList = Collections.singletonList(jasperPrintAccessor.getJasperPrint());
			
			JRPrintImage image = HtmlExporter.getImage(jasperPrintList, imageName);
			
			Renderable renderer = image.getRenderable();
			if (renderer.getTypeValue() == RenderableTypeEnum.SVG)
			{
				renderer = 
					new JRWrappingSvgRenderer(
						renderer, 
						new Dimension(image.getWidth(), image.getHeight()),
						ModeEnum.OPAQUE == image.getModeValue() ? image.getBackcolor() : null
						);
			}

			imageMimeType = renderer.getImageTypeValue().getMimeType();
			
			try
			{
				imageData = renderer.getImageData(jasperReportsContext);
			}
			catch (JRException e)
			{
				throw new JRRuntimeException(e);
			}
		}

		if (imageData != null && imageData.length > 0)
		{
			if (imageMimeType != null) 
			{
				response.setHeader("Content-Type", imageMimeType);
			}
			response.setContentLength(imageData.length);
			
			ServletOutputStream outputStream = null;
			try
			{
				outputStream = response.getOutputStream();
				outputStream.write(imageData, 0, imageData.length);
				outputStream.flush();
			}
			catch (IOException e)
			{
				throw new JRRuntimeException(e);
			}
			finally
			{
				if (outputStream != null)
				{
					try
					{
						outputStream.close();
					}
					catch (IOException e)
					{
					}
				}
			}
		}
		
		return true;
	}


}