Use annotations for operation descriptions (#851)

* Autodiscover operations at startup. Use annotations for descriptions

Re-enable CompatibilityTest. Fix some backwards compatbility issues.

Not really a fan of injecting the Injector into the Operations class. Need to see if there's a better solution

* Cleanup from review comments

core/src/main/java/edu/wpi/grip/core/Description.java

@@ -0,0 +1,49 @@
+package edu.wpi.grip.core;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import static edu.wpi.grip.core.OperationDescription.Category;
+import static edu.wpi.grip.core.OperationDescription.Category.MISCELLANEOUS;
+
+/**
+ * Annotates an {@link Operation} subclass to describe it. This annotation gets transformed into a
+ * {@link OperationDescription}. All operation classes with this annotation will be automatically
+ * discovered and added to the palette at startup.
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Description {
+
+  /**
+   * The name of the operation being described.
+   */
+  String name();
+
+  /**
+   * A brief summary of the operation. In-depth descriptions, usage guides, and examples
+   * should be on the wiki, not here.
+   */
+  String summary();
+
+  /**
+   * The category the operation belongs to. Defaults to
+   * {@link OperationDescription.Category#MISCELLANEOUS MISCELLANEOUS}.
+   */
+  Category category() default MISCELLANEOUS;
+
+  /**
+   * All known aliases of the operation. If the name of the operation changes, the previous name
+   * should be here. Defaults to an empty array.
+   */
+  String[] aliases() default {};
+
+  /**
+   * The name of the icon to use to display the operation. If empty ({@code ""}), no icon will be
+   * shown. The icon should be located in {@code /edu/wpi/grip/ui/icons/}.
+   */
+  String iconName() default "";
+
+}

core/src/main/java/edu/wpi/grip/core/OperationDescription.java

@@ -27,6 +27,33 @@ public class OperationDescription {
   private final Icon icon;
   private final ImmutableSet<String> aliases;
 
+  /**
+   * Creates an operation description from a {@link Description @Description} annotation on
+   * an operation subclass.
+   */
+  public static OperationDescription from(Description description) {
+    checkNotNull(description, "The description annotation cannot be null");
+    String iconName = description.iconName();
+    return builder()
+        .name(description.name())
+        .summary(description.summary())
+        .category(description.category())
+        .aliases(description.aliases())
+        .icon(iconName.isEmpty() ? null : Icon.iconStream(iconName))
+        .build();
+  }
+
+  /**
+   * Creates an operation description from a {@link Description @Description} annotation on
+   * an operation subclass. The class is assumed to have the annotation; be careful when using this
+   * method.
+   *
+   * @param clazz the class to generate a description for
+   */
+  public static OperationDescription from(Class<? extends Operation> clazz) {
+    return from(clazz.getAnnotation(Description.class));
+  }
+
   /**
    * Private constructor - use {@link #builder} to instantiate this class.
    */
@@ -182,7 +209,7 @@ public Builder category(Category category) {
     }
 
     /**
-     * Sets the icon.
+     * Sets the icon. If {@code null}, the operation will have no icon.
      */
     public Builder icon(Icon icon) {
       this.icon = icon;

core/src/main/java/edu/wpi/grip/core/operations/CVOperations.java

@@ -366,7 +366,8 @@ public class CVOperations {
             )),
 
         new OperationMetaData(CVOperation.defaults("CV Threshold",
-            "Apply a fixed-level threshold to each array element in an image."),
+            "Apply a fixed-level threshold to each array element in an image.",
+            "CV threshold"),
             templateFactory.create(
                 SocketHints.Inputs.createMatSocketHint("src", false),
                 SocketHints.Inputs.createNumberSpinnerSocketHint("thresh", 0),

core/src/main/java/edu/wpi/grip/core/operations/composite/BlurOperation.java

@@ -1,14 +1,15 @@
 package edu.wpi.grip.core.operations.composite;
 
+import edu.wpi.grip.core.Description;
 import edu.wpi.grip.core.Operation;
 import edu.wpi.grip.core.OperationDescription;
 import edu.wpi.grip.core.sockets.InputSocket;
 import edu.wpi.grip.core.sockets.OutputSocket;
 import edu.wpi.grip.core.sockets.SocketHint;
 import edu.wpi.grip.core.sockets.SocketHints;
-import edu.wpi.grip.core.util.Icon;
 
 import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
 
 import java.util.List;
 
@@ -22,18 +23,12 @@
 /**
  * An {@link Operation} that softens an image using one of several different filters.
  */
+@Description(name = "Blur",
+             summary = "Blurs an image to remove noise",
+             category = OperationDescription.Category.IMAGE_PROCESSING,
+             iconName = "blur")
 public class BlurOperation implements Operation {
 
-  /**
-   * Describes this operation. This is used by the 'Operations' class to add operations to GRIP.
-   */
-  public static final OperationDescription DESCRIPTION =
-      OperationDescription.builder()
-          .name("Blur")
-          .summary("Blurs an image to remove noise")
-          .category(OperationDescription.Category.IMAGE_PROCESSING)
-          .icon(Icon.iconStream("blur"))
-          .build();
   private final SocketHint<Mat> inputHint = SocketHints.Inputs.createMatSocketHint("Input", false);
   private final SocketHint<Type> typeHint = SocketHints.createEnumSocketHint("Type", Type.BOX);
   private final SocketHint<Number> radiusHint = SocketHints.Inputs
@@ -44,9 +39,10 @@ public class BlurOperation implements Operation {
   private final InputSocket<Number> radiusSocket;
   private final OutputSocket<Mat> outputSocket;
 
+  @Inject
   @SuppressWarnings("JavadocMethod")
-  public BlurOperation(InputSocket.Factory inputSocketFactory, OutputSocket.Factory
-      outputSocketFactory) {
+  public BlurOperation(InputSocket.Factory inputSocketFactory,
+                       OutputSocket.Factory outputSocketFactory) {
     this.inputSocket = inputSocketFactory.create(inputHint);
     this.typeSocket = inputSocketFactory.create(typeHint);
     this.radiusSocket = inputSocketFactory.create(radiusHint);

core/src/main/java/edu/wpi/grip/core/operations/composite/CascadeClassifierOperation.java

@@ -1,14 +1,15 @@
 package edu.wpi.grip.core.operations.composite;
 
+import edu.wpi.grip.core.Description;
 import edu.wpi.grip.core.Operation;
 import edu.wpi.grip.core.OperationDescription;
 import edu.wpi.grip.core.sockets.InputSocket;
 import edu.wpi.grip.core.sockets.OutputSocket;
 import edu.wpi.grip.core.sockets.SocketHint;
 import edu.wpi.grip.core.sockets.SocketHints;
-import edu.wpi.grip.core.util.Icon;
 
 import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
 
 import org.bytedeco.javacpp.opencv_core.Mat;
 import org.bytedeco.javacpp.opencv_core.Rect;
@@ -22,16 +23,12 @@
 /**
  * Operation for identifying parts of an image with a cascade classifier.
  */
+@Description(name = "Cascade Cassifier",
+             summary = "Runs a Haar cascade classifier on an image",
+             category = OperationDescription.Category.FEATURE_DETECTION,
+             iconName = "opencv")
 public class CascadeClassifierOperation implements Operation {
 
-  public static final OperationDescription DESCRIPTION =
-      OperationDescription.builder()
-          .name("Cascade Classifier")
-          .summary("Runs a cascade classifier on an image")
-          .icon(Icon.iconStream("opencv"))
-          .category(OperationDescription.Category.FEATURE_DETECTION)
-          .build();
-
   private final SocketHint<Mat> imageHint =
       SocketHints.Inputs.createMatSocketHint("Image", false);
   private final SocketHint<CascadeClassifier> classifierHint =
@@ -60,6 +57,7 @@ public class CascadeClassifierOperation implements Operation {
   private final InputSocket<Size> maxSizeSocket;
   private final OutputSocket<RectsReport> output;
 
+  @Inject
   @SuppressWarnings("JavadocMethod")
   public CascadeClassifierOperation(InputSocket.Factory isf, OutputSocket.Factory osf) {
     imageSocket = isf.create(imageHint);

core/src/main/java/edu/wpi/grip/core/operations/composite/ConvexHullsOperation.java

@@ -1,12 +1,14 @@
 package edu.wpi.grip.core.operations.composite;
 
+import edu.wpi.grip.core.Description;
 import edu.wpi.grip.core.Operation;
 import edu.wpi.grip.core.OperationDescription;
 import edu.wpi.grip.core.sockets.InputSocket;
 import edu.wpi.grip.core.sockets.OutputSocket;
 import edu.wpi.grip.core.sockets.SocketHint;
 
 import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
 
 import java.util.List;
 
@@ -17,22 +19,19 @@
  * An {@link Operation} that finds the convex hull of each of a list of contours. This can help
  * remove holes in detected shapes, making them easier to analyze.
  */
+@Description(name = "Convex Hulls",
+             summary = "Compute the convex hulls of contours",
+             category = OperationDescription.Category.FEATURE_DETECTION)
 public class ConvexHullsOperation implements Operation {
 
-  public static final OperationDescription DESCRIPTION =
-      OperationDescription.builder()
-          .name("Convex Hulls")
-          .summary("Compute the convex hulls of contours")
-          .category(OperationDescription.Category.FEATURE_DETECTION)
-          .build();
-
   private final SocketHint<ContoursReport> contoursHint = new SocketHint.Builder<>(ContoursReport
       .class)
       .identifier("Contours").initialValueSupplier(ContoursReport::new).build();
 
   private final InputSocket<ContoursReport> inputSocket;
   private final OutputSocket<ContoursReport> outputSocket;
 
+  @Inject
   @SuppressWarnings("JavadocMethod")
   public ConvexHullsOperation(InputSocket.Factory inputSocketFactory, OutputSocket.Factory
       outputSocketFactory) {

core/src/main/java/edu/wpi/grip/core/operations/composite/DesaturateOperation.java

@@ -1,14 +1,15 @@
 package edu.wpi.grip.core.operations.composite;
 
+import edu.wpi.grip.core.Description;
 import edu.wpi.grip.core.Operation;
 import edu.wpi.grip.core.OperationDescription;
 import edu.wpi.grip.core.sockets.InputSocket;
 import edu.wpi.grip.core.sockets.OutputSocket;
 import edu.wpi.grip.core.sockets.SocketHint;
 import edu.wpi.grip.core.sockets.SocketHints;
-import edu.wpi.grip.core.util.Icon;
 
 import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
 
 import java.util.List;
 
@@ -20,22 +21,19 @@
 /**
  * An {@link Operation} that converts a color image into shades of gray.
  */
+@Description(name = "Desaturate",
+             summary = "Convert a color image into shades of gray",
+             category = OperationDescription.Category.IMAGE_PROCESSING,
+             iconName = "desaturate")
 public class DesaturateOperation implements Operation {
 
-  public static final OperationDescription DESCRIPTION =
-      OperationDescription.builder()
-          .name("Desaturate")
-          .summary("Convert a color image into shades of gray.")
-          .category(OperationDescription.Category.IMAGE_PROCESSING)
-          .icon(Icon.iconStream("desaturate"))
-          .build();
-
   private final SocketHint<Mat> inputHint = SocketHints.Inputs.createMatSocketHint("Input", false);
   private final SocketHint<Mat> outputHint = SocketHints.Outputs.createMatSocketHint("Output");
 
   private final InputSocket<Mat> inputSocket;
   private final OutputSocket<Mat> outputSocket;
 
+  @Inject
   @SuppressWarnings("JavadocMethod")
   public DesaturateOperation(InputSocket.Factory inputSocketFactory, OutputSocket.Factory
       outputSocketFactory) {

core/src/main/java/edu/wpi/grip/core/operations/composite/DistanceTransformOperation.java

@@ -1,14 +1,15 @@
 package edu.wpi.grip.core.operations.composite;
 
+import edu.wpi.grip.core.Description;
 import edu.wpi.grip.core.Operation;
 import edu.wpi.grip.core.OperationDescription;
 import edu.wpi.grip.core.sockets.InputSocket;
 import edu.wpi.grip.core.sockets.OutputSocket;
 import edu.wpi.grip.core.sockets.SocketHint;
 import edu.wpi.grip.core.sockets.SocketHints;
-import edu.wpi.grip.core.util.Icon;
 
 import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
 
 import org.bytedeco.javacpp.opencv_core.Mat;
 
@@ -23,16 +24,13 @@
 /**
  * GRIP {@link Operation} for {@link org.bytedeco.javacpp.opencv_imgproc#distanceTransform}.
  */
+@Description(name = "Distance Transform",
+             summary = "Sets the values of pixels in a binary image to their distance to"
+                 + " the nearest black pixel",
+             category = OperationDescription.Category.IMAGE_PROCESSING,
+             iconName = "opencv")
 public class DistanceTransformOperation implements Operation {
 
-  public static final OperationDescription DESCRIPTION =
-      OperationDescription.builder()
-          .name("Distance Transform")
-          .summary("Sets the values of pixels in a binary image to their distance to the nearest "
-              + "black pixel.")
-          .category(OperationDescription.Category.IMAGE_PROCESSING)
-          .icon(Icon.iconStream("opencv"))
-          .build();
   private final SocketHint<Mat> srcHint = SocketHints.Inputs.createMatSocketHint("Input", false);
   private final SocketHint<Type> typeHint = SocketHints.createEnumSocketHint("Type", Type.DIST_L2);
   private final SocketHint<MaskSize> maskSizeHint = SocketHints.createEnumSocketHint("Mask size",
@@ -43,6 +41,7 @@ public class DistanceTransformOperation implements Operation {
   private final InputSocket<MaskSize> maskSizeSocket;
   private final OutputSocket<Mat> outputSocket;
 
+  @Inject
   @SuppressWarnings("JavadocMethod")
   public DistanceTransformOperation(InputSocket.Factory inputSocketFactory, OutputSocket.Factory
       outputSocketFactory) {

core/src/main/java/edu/wpi/grip/core/operations/composite/FilterContoursOperation.java

@@ -1,14 +1,15 @@
 package edu.wpi.grip.core.operations.composite;
 
+import edu.wpi.grip.core.Description;
 import edu.wpi.grip.core.Operation;
 import edu.wpi.grip.core.OperationDescription;
 import edu.wpi.grip.core.sockets.InputSocket;
 import edu.wpi.grip.core.sockets.OutputSocket;
 import edu.wpi.grip.core.sockets.SocketHint;
 import edu.wpi.grip.core.sockets.SocketHints;
-import edu.wpi.grip.core.util.Icon;
 
 import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
 
 import java.util.List;
 
@@ -28,16 +29,12 @@
  * small objects, as well as contours that do not meet the expected characteristics of the feature
  * we're actually looking for.  So, this operation can help narrow them down.
  */
+@Description(name = "Filter Contours",
+             summary = "Find contours matching certain criteria",
+             category = OperationDescription.Category.FEATURE_DETECTION,
+             iconName = "find-contours")
 public class FilterContoursOperation implements Operation {
 
-  public static final OperationDescription DESCRIPTION =
-      OperationDescription.builder()
-          .name("Filter Contours")
-          .summary("Find contours matching certain criteria")
-          .category(OperationDescription.Category.FEATURE_DETECTION)
-          .icon(Icon.iconStream("find-contours"))
-          .build();
-
   private final SocketHint<ContoursReport> contoursHint = new SocketHint.Builder<>(ContoursReport
       .class)
       .identifier("Contours").initialValueSupplier(ContoursReport::new).build();
@@ -92,6 +89,7 @@ public class FilterContoursOperation implements Operation {
 
   private final OutputSocket<ContoursReport> outputSocket;
 
+  @Inject
   @SuppressWarnings("JavadocMethod")
   public FilterContoursOperation(InputSocket.Factory inputSocketFactory, OutputSocket.Factory
       outputSocketFactory) {