Add some toString() implementations

spring-shell2-core/src/main/java/org/springframework/shell2/CompletionProposal.java

@@ -78,4 +78,9 @@ public class CompletionProposal {
 	public void category(String category) {
 		this.category = category;
 	}
+
+	@Override
+	public String toString() {
+		return value;
+	}
 }

spring-shell2-core/src/main/java/org/springframework/shell2/MethodTarget.java

@@ -74,4 +74,9 @@ public class MethodTarget {
 		result = 31 * result + help.hashCode();
 		return result;
 	}
+
+	@Override
+	public String toString() {
+		return method.toString();
+	}
 }

spring-shell2-core/src/main/java/org/springframework/shell2/standard/StandardMethodTargetResolver.java

@@ -16,6 +16,9 @@
 
 package org.springframework.shell2.standard;
 
+import static org.springframework.util.StringUtils.collectionToCommaDelimitedString;
+import static org.springframework.util.StringUtils.collectionToDelimitedString;
+
 import java.util.HashMap;
 import java.util.Map;
 
@@ -24,7 +27,9 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.shell2.MethodTarget;
 import org.springframework.shell2.MethodTargetResolver;
 import org.springframework.stereotype.Component;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.ReflectionUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * The standard implementation of {@link MethodTargetResolver} for new shell applications,
@@ -59,4 +64,10 @@ public class StandardMethodTargetResolver implements MethodTargetResolver {
 		}
 		return methodTargets;
 	}
+
+	@Override
+	public String toString() {
+		return getClass().getSimpleName() + " contributing "
+			+ collectionToDelimitedString(resolve().keySet(), ", ", "[", "]");
+	}
 }

spring-shell2-core/src/main/java/org/springframework/shell2/standard/StandardParameterResolver.java

@@ -429,6 +429,11 @@ public class StandardParameterResolver implements ParameterResolver {
 		public int hashCode() {
 			return Objects.hash(method, words);
 		}
+
+		@Override
+		public String toString() {
+			return method.getName() + " " + words;
+		}
 	}
 
 	private static class ParameterRawValue {
@@ -473,6 +478,15 @@ public class StandardParameterResolver implements ParameterResolver {
 		public boolean positional() {
 			return key == null;
 		}
+
+		@Override
+		public String toString() {
+			return "ParameterRawValue{" +
+				"value='" + value + '\'' +
+				", explicit=" + explicit +
+				", key='" + key + '\'' +
+				'}';
+		}
 	}
 
 }

spring-shell2-core/src/main/java/org/springframework/shell2/standard/ValueProviderSupport.java

@@ -20,6 +20,10 @@ import org.springframework.core.MethodParameter;
 import org.springframework.shell2.CompletionContext;
 
 /**
+ * Base class for {@link ValueProvider} that match by type. Subclasses {@literal C} will be selected for parameters
+ * whose {@literal @}{@link ShellOption#valueProvider()} return the concrete class {@literal C}.
+ *
+ * @author Eric Bottard
  */
 public abstract class ValueProviderSupport implements ValueProvider {
 

spring-shell2-shell1-adapter/src/main/java/org/springframework/shell2/legacy/LegacyMethodTargetResolver.java

@@ -16,6 +16,8 @@
 
 package org.springframework.shell2.legacy;
 
+import static org.springframework.util.StringUtils.collectionToDelimitedString;
+
 import java.util.HashMap;
 import java.util.Map;
 
@@ -57,4 +59,11 @@ public class LegacyMethodTargetResolver implements MethodTargetResolver {
 		}
 		return methodTargets;
 	}
+
+	@Override
+	public String toString() {
+		return getClass().getSimpleName() + " contributing "
+			+ collectionToDelimitedString(resolve().keySet(), ", ", "[", "]");
+	}
+
 }