picturedetailtag.java

来自「一个免费wap站」· Java 代码 · 共 136 行

package com.eline.wap.catalog.taglib.wml;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.blue.imageio.ImageGenerator;
import com.blue.imageio.Size;
import com.eline.wap.catalog.client.CatalogHelper;
import com.eline.wap.catalog.exceptions.CatalogException;
import com.eline.wap.catalog.model.Item;
import com.eline.wap.catalog.model.SingleItem;
import com.eline.wap.catalog.util.ImageProcessor;
import com.eline.wap.cmi.exceptions.CMIException;
import com.eline.wap.cmi.model.MobileCapability;
import com.eline.wap.cmi.util.BrowserCapabilities;
import com.eline.wap.common.util.AppLogger;
import com.eline.wap.resource.client.PictureHelper;
import com.eline.wap.resource.model.Picture;

public class PictureDetailTag extends TagSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = -1096132425690169410L;

	private int catalogId;
	private Item item = null;
	private Picture picture = null;
	
	private String previewURL = null;
	private String downloadURL = null;

	public int doStartTag() throws JspException {
		try {
			CatalogHelper catalogHelper = new CatalogHelper();
			PictureHelper pictureHelper = new PictureHelper();

			item = catalogHelper.getItem(catalogId);
			if (item == null
					|| !(item instanceof SingleItem)
					|| ((SingleItem) item).getSingleAttribute() != SingleItem.SINGLE_PICTURE)
				throw new CatalogException("Invalid item specified.");
			
			picture = pictureHelper.getPicture(((SingleItem) item).getResourceId());

		} catch (Exception e) {
			// throw new JspException(e.getMessage());
			writeErrorBody(e.getMessage());
			return SKIP_BODY;
		}
		return EVAL_BODY_INCLUDE;
	}
	
	private void writeErrorBody(String message) {
		JspWriter out = pageContext.getOut();
		try {
			out.println("<b>Sorry, Error occures!</b><br/>");
			if (message != null && message.length() > 0)
				out.println("message: " + message);
		} catch (IOException e) {}
	}
	
	public int doEndTag() throws JspException {
		picture = null;
		previewURL = null;
		downloadURL = null;

		return EVAL_PAGE;
	}

	public void setCatalogId(int catalogId) {
		this.catalogId = catalogId;
	}

	public Item getItem() {
		return item;
	}

	public Picture getPicture() {
		return picture;
	}
	
	public String getPreviewPictureURL() {
		if (previewURL == null) {
			try {
				ImageProcessor processor = new ImageProcessor(pageContext, picture);
				previewURL = processor.getPreviewImageURL();
			} catch (CatalogException e) {
				AppLogger.error("PictureDetailTag.getPreviewPictureURL() CatalogException : " + e.getMessage());
				return null;
			}
		}
		return previewURL;
	}
	
	public MobileCapability getMobileCapability() {
		MobileCapability result = null;
		try {
			BrowserCapabilities capabilities = new BrowserCapabilities(pageContext);
			result = capabilities.getCurrent();
		} catch (CMIException e) {}
		return result;
	}

	public String getDownloadPictureURL() {
		if (downloadURL == null) {
			try {
				BrowserCapabilities capabilities = new BrowserCapabilities(pageContext);
				String extension = capabilities.getCurrent().getPreferredImageMime();
				
				String mime = extension.equalsIgnoreCase("jpg") ? ImageGenerator.MIME_JPG
						: extension.equalsIgnoreCase("gif") ? ImageGenerator.MIME_GIF
								: ImageGenerator.MIME_PNG;

				Size size = new Size();
				size.setWidth(capabilities.getCurrent().getScreenPixelsWidth());
				size.setHeight(capabilities.getCurrent().getScreenPixelsHeight());
	
				ImageProcessor processor = new ImageProcessor(pageContext, picture);
				downloadURL = processor.getImageURL(size, mime);
			} catch (CMIException e) {
				AppLogger.error("PictureDetailTag.getPreviewPictureURL() CMIException : " + e.getMessage());
				return null;
			} catch (CatalogException e) {
				AppLogger.error("PictureDetailTag.getPreviewPictureURL() CatalogException : " + e.getMessage());
				return null;
			}
		}
		return downloadURL;
	}
}