/*
    * 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.IOException;
  import java.io.InputStream;
  import java.net.URL;
  
  public final class ClasspathResource implements Resource {
  
      public static final String PREFIX = "classpath:";
  
      private final String name;
      private final ClassLoader classLoader;
  
      protected ClasspathResource(final String name,
              final ClassLoader classLoader) {
      	if (name == null || name.length() == 0) {
              throw new IllegalArgumentException("'name' can't be empty or null");
          }
          if (classLoader == null) {
              throw new IllegalArgumentException("'classLoader' can't ne null");
          }
          
          this.name = stripPrefix(name);
          this.classLoader = classLoader;
      }
  
      public String getName() {
      	return name;
      }
      
      public String getSimpleName() {
      	int slash = name.lastIndexOf('/');
      	if (slash > 0) {
      		return name.substring(slash);
      	} else {
      		return name;
      	}
      }
      
      public InputStream getInputStream() throws IOException {
          final URL location = classLoader.getResource(getName());
          if (location == null) {
              throwLocationNotFoundException();
          }
          return location.openStream();
      }
  
      public URL getLocation() throws IOException {
          final URL location = classLoader.getResource(getName());
          if (location == null) {
              throwLocationNotFoundException();
          }
          return location;
      }
  
      public String getPath() {
          final URL location = classLoader.getResource(getName());
          if (location == null) {
              throwLocationNotFoundException();
          }
          return location.getPath();
      }
  
      public String toString() {
      	StringBuilder str = new StringBuilder(PREFIX);
      	str.append(name);
      	return str.toString();
      }
      
      private void throwLocationNotFoundException() {
          throw new ClasspathLocationNotFoundException(
                  "Resource location for classpath resource '" + getName()
                  + "' couldn't be identified.");
      }
      
      private static String stripPrefix(String resourceName) {
          if (resourceName.startsWith(PREFIX)) {
              return resourceName.substring(PREFIX.length());
          }
          return resourceName;
      }
     
 }