Merge branch 'generic-types'

This branch makes progress on a unified Types utility class
for introspecting Java types. It is not yet fully complete,
but it needs to be merged now so that the work is not lost
when we begin the SciJava modularization.

Author: ctrueden

NOTICE.txt

@@ -0,0 +1,206 @@
+This project contains code adapted from Apache Commons Lang
+(https://commons.apache.org/proper/commons-lang/) version 3.4,
+as well as GenTyRef (https://github.com/coekie/gentyref) version 1.1.0,
+both of which are licensed under the Apache 2.0 license, as follows:
+
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pom.xml

@@ -10,7 +10,7 @@
 	</parent>
 
 	<artifactId>scijava-common</artifactId>
-	<version>2.69.1-SNAPSHOT</version>
+	<version>2.70.0-SNAPSHOT</version>
 
 	<name>SciJava Common</name>
 	<description>SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.</description>
@@ -172,11 +172,6 @@ Konstanz, and KNIME GmbH.</license.copyrightOwners>
 		</dependency>
 
 		<!-- Third-party dependencies -->
-		<dependency>
-			<groupId>com.googlecode.gentyref</groupId>
-			<artifactId>gentyref</artifactId>
-			<version>1.1.0</version>
-		</dependency>
 		<dependency>
 			<groupId>org.bushe</groupId>
 			<artifactId>eventbus</artifactId>

src/main/java/org/scijava/Context.java

@@ -52,6 +52,7 @@
 import org.scijava.service.ServiceIndex;
 import org.scijava.util.ClassUtils;
 import org.scijava.util.Query;
+import org.scijava.util.Types;
 
 /**
  * Top-level SciJava application context, which initializes and maintains a list
@@ -323,7 +324,7 @@ public <S extends Service> S service(final Class<S> c) {
 	 *           service.
 	 */
 	public Service service(final String className) {
-		final Class<?> c = ClassUtils.loadClass(className, false);
+		final Class<?> c = Types.load(className, false);
 		if (!Service.class.isAssignableFrom(c)) {
 			throw new IllegalArgumentException("Not a service class: " + c.getName());
 		}
@@ -342,7 +343,7 @@ public <S extends Service> S getService(final Class<S> c) {
 
 	/** Gets the service of the given class name (useful for scripts). */
 	public Service getService(final String className) {
-		final Class<?> c = ClassUtils.loadClass(className);
+		final Class<?> c = Types.load(className);
 		if (c == null) return null;
 		if (!Service.class.isAssignableFrom(c)) return null; // not a service class
 		@SuppressWarnings("unchecked")

src/main/java/org/scijava/Locatable.java

@@ -34,7 +34,7 @@
 
 import java.net.URL;
 
-import org.scijava.util.ClassUtils;
+import org.scijava.util.Types;
 
 /**
  * An object whose location is defined by a URL string.
@@ -45,7 +45,7 @@ public interface Locatable {
 
 	/** Gets the URL string defining the object's location. */
 	default String getLocation() {
-		final URL location = ClassUtils.getLocation(getClass());
+		final URL location = Types.location(getClass());
 		return location == null ? null : location.toExternalForm();
 	}
 

src/main/java/org/scijava/command/CommandInfo.java

@@ -57,6 +57,7 @@
 import org.scijava.plugin.PluginInfo;
 import org.scijava.util.ClassUtils;
 import org.scijava.util.StringMaker;
+import org.scijava.util.Types;
 
 /**
  * A collection of metadata about a particular {@link Command}.
@@ -502,8 +503,7 @@ private void checkFields(final Class<?> type) {
 	private boolean isImmutable(final Class<?> type) {
 		// NB: All eight primitive types, as well as the boxed primitive
 		// wrapper classes, as well as strings, are immutable objects.
-		return ClassUtils.isNumber(type) || ClassUtils.isText(type) ||
-			ClassUtils.isBoolean(type);
+		return Types.isNumber(type) || Types.isText(type) || Types.isBoolean(type);
 	}
 
 	private Class<?> loadCommandClass() {

src/main/java/org/scijava/command/CommandModuleItem.java

@@ -46,7 +46,7 @@
 import org.scijava.plugin.Attr;
 import org.scijava.plugin.Parameter;
 import org.scijava.util.ConversionUtils;
-import org.scijava.util.GenericUtils;
+import org.scijava.util.Types;
 
 /**
  * {@link ModuleItem} implementation describing an input or output of a command.
@@ -76,16 +76,15 @@ public Parameter getParameter() {
 
 	@Override
 	public Class<T> getType() {
-		final Class<?> type =
-			GenericUtils.getFieldClasses(field, getDelegateClass()).get(0);
+		final Class<?> type = Types.raw(Types.fieldType(field, getDelegateClass()));
 		@SuppressWarnings("unchecked")
 		final Class<T> typedType = (Class<T>) type;
 		return typedType;
 	}
 
 	@Override
 	public Type getGenericType() {
-		return GenericUtils.getFieldType(field, getDelegateClass());
+		return Types.fieldType(field, getDelegateClass());
 	}
 
 	@Override
@@ -254,7 +253,7 @@ private T tValue(final String value) {
 
 	private <D> D tValue(final String value, final Class<D> type) {
 		if (value == null || value.isEmpty()) return null;
-		final Class<D> saneType = ConversionUtils.getNonprimitiveType(type);
+		final Class<D> saneType = Types.box(type);
 		return ConversionUtils.convert(value, saneType);
 	}
 

src/main/java/org/scijava/convert/AbstractConverter.java

@@ -38,8 +38,7 @@
 import org.scijava.object.ObjectService;
 import org.scijava.plugin.AbstractHandlerPlugin;
 import org.scijava.plugin.Parameter;
-import org.scijava.util.ConversionUtils;
-import org.scijava.util.GenericUtils;
+import org.scijava.util.Types;
 
 /**
  * Abstract superclass for {@link Converter} plugins. Performs appropriate
@@ -109,15 +108,15 @@ public boolean canConvert(final Object src, final Class<?> dest) {
 	@Override
 	public boolean canConvert(final Class<?> src, final Class<?> dest) {
 		if (src == null) return false;
-		final Class<?> saneSrc = ConversionUtils.getNonprimitiveType(src);
-		final Class<?> saneDest = ConversionUtils.getNonprimitiveType(dest);
-		return ConversionUtils.canCast(saneSrc, getInputType()) &&
-			ConversionUtils.canCast(getOutputType(), saneDest);
+		final Class<?> saneSrc = Types.box(src);
+		final Class<?> saneDest = Types.box(dest);
+		return Types.isAssignable(saneSrc, getInputType()) &&
+			Types.isAssignable(getOutputType(), saneDest);
 	}
 
 	@Override
 	public Object convert(final Object src, final Type dest) {
-		final Class<?> destClass = GenericUtils.getClass(dest);
+		final Class<?> destClass = Types.raw(dest);
 		return convert(src, destClass);
 	}
 
@@ -155,7 +154,7 @@ public Class<ConversionRequest> getType() {
 	@Override
 	@Deprecated
 	public boolean canConvert(final Class<?> src, final Type dest) {
-		final Class<?> destClass = GenericUtils.getClass(dest);
+		final Class<?> destClass = Types.raw(dest);
 		return canConvert(src, destClass);
 	}
 }