net.sf.jasperreports.jsf.resource.DefaultResourceResolver.java Source code

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Here is the source code for net.sf.jasperreports.jsf.resource.DefaultResourceResolver.java

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/*
 * JaspertReports JSF Plugin Copyright (C) 2011 A. Alonso Dominguez
 *
 * This library 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 2.1 of the License, or (at
 * your option) any later version. This library 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 this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA A.
 *
 * Alonso Dominguez
 * alonsoft@users.sf.net
 */
package net.sf.jasperreports.jsf.resource;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

import net.sf.jasperreports.jsf.Constants;
import net.sf.jasperreports.jsf.component.UIReport;
import net.sf.jasperreports.jsf.context.ExternalContextHelper;
import net.sf.jasperreports.jsf.context.JRFacesContext;
import net.sf.jasperreports.jsf.util.Util;

import static org.apache.commons.io.FilenameUtils.*;

/**
 *
 * @author aalonsodominguez
 */
public final class DefaultResourceResolver implements ResourceResolver {

    private static final Logger logger = Logger.getLogger(DefaultResourceResolver.class.getPackage().getName(),
            Constants.LOG_MESSAGES_BUNDLE);

    public Resource resolveResource(FacesContext context, UIComponent component, String name) {
        if (name == null || name.length() == 0) {
            throw new IllegalArgumentException("Resource name must be provided.");
        }

        Resource resource = null;
        try {
            final URL url = new URL(name);
            resource = new URLResource(url);
        } catch (MalformedURLException e) {
            final ClassLoader loader = Util.getClassLoader(this);
            if (name.startsWith(ClasspathResource.PREFIX)) {
                resource = new ClasspathResource(name, loader);
            } else if (name.startsWith("/")) {
                resource = new ContextResource(name);
            } else if (loader.getResource(name) != null) {
                resource = new ClasspathResource(name, loader);
            } else {
                resource = resolveRelative(context, component, name);
            }
        }

        // If at this point 'resource' is null then the resource couldn't
        // be resolved by this ResourceResolver implementation
        return resource;
    }

    private Resource resolveRelative(FacesContext context, UIComponent component, String name) {
        if (logger.isLoggable(Level.FINE)) {
            logger.log(Level.FINE, "JRJSF_0039", name);
        }

        Resource resource = null;
        JRFacesContext jrContext = JRFacesContext.getInstance(context);
        ExternalContextHelper helper = jrContext.getExternalContextHelper(context);
        String rootPath = null;

        if ((component != null) && (component instanceof UIReport)) {
            // If caller component is a report-based component then try to
            // resolve the resource relative to the report resource (if given).

            Object value = ((UIReport) component).getValue();
            if (value != null && (value instanceof String)) {
                String valueStr = (String) value;
                if (!valueStr.equals(name)) {
                    // If the resource we are trying to resolve is the one
                    // established in the report itself then resolve it
                    // using the current viewRoot

                    //cristhiank: If its relative to a classpath resource
                    final ClassLoader loader = Util.getClassLoader(this);
                    if (valueStr.startsWith(ClasspathResource.PREFIX)) {
                        String completeName = valueStr.substring(0, valueStr.lastIndexOf("/") + 1) + name;
                        resource = new ClasspathResource(completeName, loader);
                    } else {
                        rootPath = helper.getResourceRealPath(context.getExternalContext(),
                                "/" + getPath((String) value));
                    }
                }
            }
        }

        if (rootPath == null) {
            // If caller component is not a report-based component or
            // there is not any component at all, resolve the resource
            // name relative to the current view.

            String viewId = context.getViewRoot().getViewId();
            rootPath = helper.getResourceRealPath(context.getExternalContext(), "/" + getPath(viewId));
        }

        if (rootPath != null) {
            String resourceFileName = rootPath + File.separator + name;
            File resourceFile = new File(normalize(resourceFileName));
            if (resourceFile.exists()) {
                resource = new FileResource(resourceFile);
            }
        }

        return resource;
    }
}