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package org.apache.tapestry.contrib.services.impl; |
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import org.apache.commons.logging.Log; |
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import org.apache.hivemind.util.Defense; |
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import org.apache.tapestry.IRequestCycle; |
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import org.apache.tapestry.engine.IEngineService; |
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import org.apache.tapestry.engine.ILink; |
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import org.apache.tapestry.error.RequestExceptionReporter; |
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import org.apache.tapestry.services.LinkFactory; |
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import org.apache.tapestry.services.ServiceConstants; |
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import org.apache.tapestry.util.ContentType; |
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import org.apache.tapestry.web.WebRequest; |
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import org.apache.tapestry.web.WebResponse; |
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import javax.imageio.ImageIO; |
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import javax.servlet.http.HttpServletResponse; |
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import java.awt.image.BufferedImage; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import java.util.HashMap; |
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import java.util.Map; |
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public class RoundedCornerService implements IEngineService { |
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public static final String SERVICE_NAME = "rounded"; |
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public static final String PARM_COLOR = "c"; |
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public static final String PARM_BACKGROUND_COLOR = "bc"; |
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public static final String PARM_WIDTH = "w"; |
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public static final String PARM_HEIGHT = "h"; |
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public static final String PARM_ANGLE = "a"; |
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public static final String PARM_SHADOW_WIDTH ="sw"; |
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public static final String PARM_SHADOW_OPACITY ="o"; |
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public static final String PARM_SHADOW_SIDE = "s"; |
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public static final String PARM_WHOLE_SHADOW = "shadow"; |
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public static final String PARM_ARC_HEIGHT = "ah"; |
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public static final String PARM_ARC_WIDTH = "aw"; |
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private static final long MONTH_SECONDS = 60 * 60 * 24 * 30; |
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private static final long EXPIRES = System.currentTimeMillis() + 365 * 24 * 60 * 60 * 1000L; |
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private RequestExceptionReporter _exceptionReporter; |
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private LinkFactory _linkFactory; |
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private WebRequest _request; |
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private WebResponse _response; |
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private RoundedCornerGenerator _generator = new RoundedCornerGenerator(); |
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private Map _imageCache = new HashMap(); |
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private Log _log; |
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private String _nonTransparentFormatName = "gif"; |
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public void initialize() |
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{ |
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String[] names = ImageIO.getWriterFormatNames(); |
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boolean supportsGif = false; |
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for (int i=0; i < names.length; i++) |
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{ |
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if (names[i].toLowerCase().equals("gif")) |
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{ |
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supportsGif = true; |
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break; |
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} |
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} |
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if (!supportsGif) |
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{ |
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_nonTransparentFormatName = "jpeg"; |
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} |
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} |
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public ILink getLink(boolean post, Object parameter) |
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{ |
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Defense.notNull(parameter, "parameter"); |
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Defense.isAssignable(parameter, Object[].class, "parameter"); |
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Object[] parms = (Object[]) parameter; |
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Map parameters = new HashMap(); |
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parameters.put(ServiceConstants.SERVICE, getName()); |
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parameters.put(ServiceConstants.PARAMETER, parms); |
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return _linkFactory.constructLink(this, post, parameters, false); |
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} |
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public void service(IRequestCycle cycle) |
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throws IOException |
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{ |
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if (_request.getHeader("If-Modified-Since") != null) |
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{ |
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_response.setStatus(HttpServletResponse.SC_NOT_MODIFIED); |
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return; |
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} |
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String color = cycle.getParameter(PARM_COLOR); |
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String bgColor = cycle.getParameter(PARM_BACKGROUND_COLOR); |
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int width = getIntParam(cycle.getParameter(PARM_WIDTH)); |
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int height = getIntParam(cycle.getParameter(PARM_HEIGHT)); |
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String angle = cycle.getParameter(PARM_ANGLE); |
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int shadowWidth = getIntParam(cycle.getParameter(PARM_SHADOW_WIDTH)); |
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float shadowOpacity = getFloatParam(cycle.getParameter(PARM_SHADOW_OPACITY)); |
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String side = cycle.getParameter(PARM_SHADOW_SIDE); |
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boolean wholeShadow = Boolean.valueOf(cycle.getParameter(PARM_WHOLE_SHADOW)).booleanValue(); |
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float arcWidth = getFloatParam(cycle.getParameter(PARM_ARC_WIDTH)); |
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float arcHeight = getFloatParam(cycle.getParameter(PARM_ARC_HEIGHT)); |
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String hashKey = color + bgColor + width + height + angle + shadowWidth + shadowOpacity + side + wholeShadow; |
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ByteArrayOutputStream bo = null; |
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try { |
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String type = (bgColor != null) ? _nonTransparentFormatName : "png"; |
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byte[] data = (byte[])_imageCache.get(hashKey); |
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if (data != null) |
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{ |
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writeImageResponse(data, type); |
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return; |
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} |
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BufferedImage image = null; |
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if (wholeShadow) |
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{ |
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image = _generator.buildShadow(color, bgColor, width, height, arcWidth, arcHeight, shadowWidth, shadowOpacity); |
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} else if (side != null) |
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{ |
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image = _generator.buildSideShadow(side, shadowWidth, shadowOpacity); |
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} else |
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{ |
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image = _generator.buildCorner(color, bgColor, width, height, angle, shadowWidth, shadowOpacity); |
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} |
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bo = new ByteArrayOutputStream(); |
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boolean success = ImageIO.write(image, type, bo); |
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data = bo.toByteArray(); |
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if (!success || data == null || data.length < 1) |
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{ |
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_log.error("Image generated had zero length byte array or failed to convert from parameters of:\n" |
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+ "[color:" + color + ", bgColor:" + bgColor |
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+ ", width:" + width + ", height:" + height |
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+ ", angle:" + angle + ", shadowWidth:" + shadowWidth |
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+ ", shadowOpacity:" + shadowOpacity + ", side:" + side |
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+ ", wholeShadow: " + wholeShadow + ", arcWidth: " + arcWidth |
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+ ", arcHeight:" + arcHeight + "\n image: " + image); |
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_response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
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return; |
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} |
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_imageCache.put(hashKey, data); |
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writeImageResponse(data, type); |
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} catch (IOException eof) |
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{ |
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} catch (Throwable ex) { |
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ex.printStackTrace(); |
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_exceptionReporter.reportRequestException("Error creating image.", ex); |
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} finally { |
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try { |
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if (bo != null) { |
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bo.close(); |
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} |
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} catch (Throwable t) { |
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} |
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} |
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} |
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void writeImageResponse(byte[] data, String type) |
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throws Exception |
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{ |
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OutputStream os = null; |
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try { |
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_response.setDateHeader("Expires", EXPIRES); |
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_response.setHeader("Cache-Control", "public, max-age=" + (MONTH_SECONDS * 3)); |
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_response.setContentLength(data.length); |
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os = _response.getOutputStream(new ContentType("image/" + type)); |
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os.write(data); |
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} finally { |
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try { |
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if (os != null) { |
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os.flush(); |
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os.close(); |
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} |
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} catch (Throwable t) { |
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} |
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} |
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} |
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private int getIntParam(String value) |
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{ |
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if (value == null) |
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return -1; |
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return Integer.valueOf(value).intValue(); |
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} |
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private float getFloatParam(String value) |
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{ |
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if (value == null) |
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return -1f; |
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return Float.valueOf(value).floatValue(); |
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} |
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public String getName() |
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{ |
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return SERVICE_NAME; |
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} |
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public void setExceptionReporter(RequestExceptionReporter exceptionReporter) |
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{ |
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_exceptionReporter = exceptionReporter; |
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} |
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public void setLinkFactory(LinkFactory linkFactory) |
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{ |
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_linkFactory = linkFactory; |
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} |
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public void setRequest(WebRequest request) |
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{ |
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_request = request; |
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} |
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public void setResponse(WebResponse response) |
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{ |
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_response = response; |
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} |
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public void setLog(Log log) |
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{ |
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_log = log; |
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} |
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} |