org.tiefaces.components.websheet.service.TieWebSheetPicturesService.java Source code

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Here is the source code for org.tiefaces.components.websheet.service.TieWebSheetPicturesService.java

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/*
 * Copyright 2017 TieFaces.
 * Licensed under MIT
 */

package org.tiefaces.components.websheet.service;

import java.io.ByteArrayInputStream;
import java.io.Serializable;
import java.util.logging.Logger;

import javax.enterprise.context.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseId;
import javax.inject.Named;

import org.apache.poi.ss.usermodel.PictureData;
import org.primefaces.model.DefaultStreamedContent;
import org.primefaces.model.StreamedContent;

/**
 * This serve as a managed bean for retrieve picture from session.
 * 
 * @author Jason Jiang
 *
 */

@Named
@SessionScoped
public class TieWebSheetPicturesService implements Serializable {

    /**
     * serialVersionUID.
     */
    private static final long serialVersionUID = 6230419110838095593L;
    /** log instance. */
    private static final Logger LOG = Logger.getLogger(TieWebSheetPicturesService.class.getName());

    /**
     * Constructor.
     */
    public TieWebSheetPicturesService() {
        LOG.fine("TieWebSheetPictureService Constructor");
    }

    /**
     * Return picture to web front end.
     *
     * @return empty (phase is render_response) or real picture ( browser
     *         request).
     */
    public StreamedContent getPicture() {
        FacesContext context = FacesContext.getCurrentInstance();

        if (context.getCurrentPhaseId() == PhaseId.RENDER_RESPONSE) {
            // So, we're rendering the HTML. Return a stub StreamedContent so
            // that it will generate right URL.
            LOG.fine(" return empty picture");
            return new DefaultStreamedContent();
        } else {
            // So, browser is requesting the image. Return a real
            // StreamedContent with the image bytes.
            String pictureId = context.getExternalContext().getRequestParameterMap().get("pictureViewId");

            PictureData picData = (PictureData) FacesContext.getCurrentInstance().getExternalContext()
                    .getSessionMap().get(pictureId);
            FacesContext.getCurrentInstance().getExternalContext().getSessionMap().remove(pictureId);
            LOG.fine(" return real picture and remove session");
            return new DefaultStreamedContent(new ByteArrayInputStream(picData.getData()));
        }
    }

}