IndependentModeler/src/cz/cvut/promod/resources/AbstractResources.java

   1 package cz.cvut.promod.resources;
   2
   3 import org.apache.log4j.Logger;
   4
   5 import javax.swing.*;
   6 import java.io.File;
   7 import java.net.URL;
   8 import java.util.HashMap;
   9 import java.util.Map;
  10
  11 public abstract class AbstractResources {
  12
  13     private static final Logger LOG = Logger.getLogger(Resources.class);
  14
  15     private final static Map<String, ImageIcon> icons = new HashMap<String, ImageIcon>();
  16     private final static Map<String, File> configFiles = new HashMap<String, File>();
  17
  18     /**
  19      * Returns the icon that has been already loaded or tries to load this icon.
  20      *
  21      * @param resourceName is the full name of required resource (= icon)
  22      * @return the required icon if no error(s) occurred, null otherwise
  23      */
  24     public static ImageIcon getIcon(final String resourceName) {
  25         ImageIcon imageIcon;
  26
  27         if (icons.containsKey(resourceName)) {
  28             imageIcon = icons.get(resourceName);
  29         } else {
  30             imageIcon = loadIcon(resourceName);
  31
  32             if(imageIcon != null){
  33                 icons.put(resourceName, imageIcon);
  34             }
  35         }
  36
  37         return imageIcon;
  38     }
  39
  40     /**
  41      * Loads the icon.
  42      *
  43      * @param resourceName is the full name of the icon
  44      * @return the required icon or null if the there is no resource with given resourceName
  45      */
  46     private static ImageIcon loadIcon(final String resourceName) {
  47         final URL systemResource = ClassLoader.getSystemResource(resourceName);
  48
  49         if (systemResource == null) {
  50             LOG.error("Resource " + resourceName + " couldn't be found.");
  51             return null;
  52         }
  53
  54         return new ImageIcon(systemResource);
  55     }
  56
  57     /**
  58      * Returns the resource that has been already loaded or tries to load this icon.
  59      *
  60      * @param resourceName is the full name of required resource
  61      * @return the required icon if no error(s) occurred, null otherwise
  62      */
  63     public static File getConfigFile(final String resourceName){
  64         File configFile;
  65
  66         if(icons.containsKey(resourceName)){
  67             configFile = configFiles.get(resourceName);
  68
  69         } else {
  70             configFile = loadConfigFile(resourceName);
  71
  72             if(configFile != null){
  73                 configFiles.put(resourceName, configFile);
  74             }
  75         }
  76
  77         return configFile;
  78     }
  79
  80     /**
  81      * Loads the config resources.
  82      *
  83      * @param resourceName is the full name of the resource
  84      * @return the required resource or null if the there is no resource with given resourceName
  85      */
  86     private static File loadConfigFile(final String resourceName) {
  87         final URL systemResource = ClassLoader.getSystemResource(resourceName);
  88
  89         if(systemResource == null){
  90             LOG.error("Resource " + resourceName + " couldn't be found.");
  91             return null;
  92         }
  93
  94         return new File(systemResource.getFile());
  95     }
  96
  97 }