From 4fca2925381f56bd08129218988eac1047be4446 Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Fri, 27 Apr 2018 12:12:31 +0200
Subject: moved ResourceLoader from dozmod to mss
---
pom.xml | 7 +-
src/main/java/org/openslx/util/ResourceLoader.java | 176 +++++++++++++++++++++
2 files changed, 182 insertions(+), 1 deletion(-)
create mode 100644 src/main/java/org/openslx/util/ResourceLoader.java
diff --git a/pom.xml b/pom.xml
index 6527be3..9e6b6d2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -110,6 +110,11 @@
2.8.1
compile
-
+
+ commons-io
+ commons-io
+ 2.5
+ compile
+
diff --git a/src/main/java/org/openslx/util/ResourceLoader.java b/src/main/java/org/openslx/util/ResourceLoader.java
new file mode 100644
index 0000000..7f829fc
--- /dev/null
+++ b/src/main/java/org/openslx/util/ResourceLoader.java
@@ -0,0 +1,176 @@
+package org.openslx.util;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Font;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.RenderingHints;
+import java.awt.font.FontRenderContext;
+import java.awt.geom.Rectangle2D;
+import java.awt.image.BufferedImage;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.log4j.Logger;
+
+/**
+ * Helper class for loading resources.
+ * This should be error safe loaders with a fall back in case the
+ * requested resource can't be found, or isn't of the expected type.
+ */
+public class ResourceLoader
+{
+
+ /**
+ * Logger for this class
+ */
+ private final static Logger LOGGER = Logger.getLogger( ResourceLoader.class );
+
+ /**
+ * Load the given resource as an ImageIcon.
+ * This is guaranteed to never throw an Exception and always return
+ * an ImageIcon. If the requested resource could not be loaded,
+ * an icon is generated, containing an error message. If even that
+ * fails, an empty icon is returned.
+ *
+ * @param path Resource path to load
+ * @param description Icon description
+ * @return ImageIcon instance
+ */
+ public static ImageIcon getIcon( String path, String description )
+ {
+ URL url = ResourceLoader.class.getResource( path );
+ if ( url == null ) {
+ LOGGER.error( "Resource not found: " + path );
+ } else {
+ try {
+ return new ImageIcon( url, description );
+ } catch ( Exception e ) {
+ LOGGER.error( "Resource not loadable: " + path );
+ }
+ }
+ // If we reach here loading failed, create image containing error
+ // message
+ try {
+ return errorIcon( "Invalid Resource: " + path );
+ } catch ( Throwable t ) {
+ return new ImageIcon();
+ }
+ }
+
+ public static Icon getIcon( String path, String description, int maxHeight, Component context )
+ {
+ ImageIcon icon = getIcon( path, description );
+ return getScaledIcon( icon, maxHeight, context );
+ }
+
+ /**
+ * Load the given resource as an ImageIcon.
+ * This is guaranteed to never throw an Exception and always return
+ * an ImageIcon. If the requested resource could not be loaded,
+ * an icon is generated, containing an error message. If even that
+ * fails, an empty icon is returned.
+ *
+ * @param path Resource path to load
+ * @return ImageIcon instance
+ */
+ public static ImageIcon getIcon( String path )
+ {
+ return getIcon( path, path );
+ }
+
+ /**
+ * Helper that will create an icon with given text.
+ *
+ * @param errorText Text to render to icon
+ * @return the icon
+ */
+ private static ImageIcon errorIcon( String errorText )
+ {
+ Font font = new Font( "Tahoma", Font.PLAIN, 20 );
+
+ // get dimensions of text
+ FontRenderContext frc = new FontRenderContext( null, true, true );
+ Rectangle2D bounds = font.getStringBounds( errorText, frc );
+ int w = (int)bounds.getWidth();
+ int h = (int)bounds.getHeight();
+
+ // create a BufferedImage object
+ BufferedImage image = new BufferedImage( w, h, BufferedImage.TYPE_INT_RGB );
+ Graphics2D g = image.createGraphics();
+
+ // set color and other parameters
+ g.setColor( Color.WHITE );
+ g.fillRect( 0, 0, w, h );
+ g.setColor( Color.RED );
+ g.setFont( font );
+
+ g.drawString( errorText, (float)bounds.getX(), (float) -bounds.getY() );
+
+ g.dispose();
+ return new ImageIcon( image, "ERROR" );
+ }
+
+ /**
+ * Tries to load the given resource treating it as a text file
+ *
+ * @param path Resource path to load
+ * @return content of the loaded resource as String
+ */
+ public static String getTextFile( String path )
+ {
+ String fileContent = null;
+ try ( InputStream stream = ResourceLoader.class.getResourceAsStream( path ) ) {
+ fileContent = IOUtils.toString( stream, StandardCharsets.UTF_8 );
+ } catch ( Exception e ) {
+ LOGGER.error( "IO error while trying to load resource '" + path + "'. See trace: ", e );
+ }
+
+ if ( fileContent != null ) {
+ return fileContent;
+ } else {
+ return "Resource '" + path + "' not found.";
+ }
+ }
+
+ public static InputStream getStream( String path )
+ {
+ return ResourceLoader.class.getResourceAsStream( path );
+ }
+
+ private static final Map iconCache = new HashMap<>();
+
+ public static Icon getScaledIcon( Icon icon, int height, Component context )
+ {
+ if ( icon == null )
+ return null;
+ ImageIcon cached = iconCache.get( icon );
+ if ( cached != null && cached.getIconHeight() == height )
+ return cached;
+ // Generate?
+ float iHeight = icon.getIconHeight();
+ float tHeight = height;
+ if ( iHeight <= tHeight )
+ return icon; // Small enough
+ // Scale down:
+ BufferedImage image = new BufferedImage( icon.getIconWidth(), icon.getIconHeight(),
+ BufferedImage.TYPE_INT_ARGB );
+ Graphics2D g = image.createGraphics();
+ g.setRenderingHint( RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY );
+ g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
+ icon.paintIcon( context, g, 0, 0 );
+ ImageIcon scaledIcon = new ImageIcon( image.getScaledInstance(
+ (int) ( icon.getIconWidth() * ( tHeight / iHeight ) ), (int) ( tHeight ), Image.SCALE_SMOOTH ) );
+ iconCache.put( icon, scaledIcon );
+ return scaledIcon;
+ }
+
+}
--
cgit v1.2.3-55-g7522