Add LocationService framework

The LocationService manages LocationResolver plugins that provide
translation from URI to Location. The LocationService itself
contains convenience methods to translate from String to Location.

Author: gab1one

src/main/java/org/scijava/io/location/AbstractLocationResolver.java

@@ -0,0 +1,72 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2017 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
+ * Institute of Molecular Cell Biology and Genetics, University of
+ * Konstanz, and KNIME GmbH.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.io.location;
+
+import java.net.URI;
+
+import org.scijava.plugin.AbstractHandlerPlugin;
+
+/**
+ * Abstract super class for {@link LocationResolver} plugins.
+ * 
+ * @author Gabriel Einsdorf
+ */
+public abstract class AbstractLocationResolver extends
+	AbstractHandlerPlugin<URI> implements LocationResolver
+{
+
+	private final String[] schemes;
+
+	/**
+	 * @param schemes the uri schmemes that the implementing sub-type supports
+	 */
+	public AbstractLocationResolver(String... schemes) {
+		assert schemes.length > 0;
+		this.schemes = schemes;
+	}
+
+	@Override
+	public boolean supports(URI uri) {
+		boolean supports = false;
+		for (final String scheme : schemes) {
+			supports = supports || scheme.equals(uri.getScheme());
+		}
+		return supports;
+	}
+
+	@Override
+	public Class<URI> getType() {
+		return URI.class;
+	}
+
+}

src/main/java/org/scijava/io/location/DefaultLocationService.java

@@ -0,0 +1,72 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2017 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
+ * Institute of Molecular Cell Biology and Genetics, University of
+ * Konstanz, and KNIME GmbH.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.io.location;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.scijava.plugin.AbstractHandlerService;
+import org.scijava.plugin.Plugin;
+import org.scijava.service.Service;
+
+/**
+ * Default {@link LocationService} implementation.
+ * 
+ * @author Gabriel Einsdorf
+ */
+@Plugin(type = Service.class)
+public class DefaultLocationService extends
+	AbstractHandlerService<URI, LocationResolver> implements
+	LocationService
+{
+
+	private final Map<String, LocationResolver> resolvers = new HashMap<>();
+
+	@Override
+	public Class<LocationResolver> getPluginType() {
+		return LocationResolver.class;
+	}
+
+	@Override
+	public Class<URI> getType() {
+		return URI.class;
+	}
+
+
+	@Override
+	public LocationResolver getResolver(final URI uri) {
+		return resolvers.computeIfAbsent(uri.getScheme(), u -> getHandler(uri));
+	}
+}

src/main/java/org/scijava/io/location/LocationResolver.java

@@ -0,0 +1,56 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2017 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
+ * Institute of Molecular Cell Biology and Genetics, University of
+ * Konstanz, and KNIME GmbH.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.io.location;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import org.scijava.plugin.HandlerPlugin;
+
+/**
+ * {@link LocationResolver} plugins allow resolving an {@link URI} to a
+ * {@link Location}. Extending {@link AbstractLocationResolver} is recommended
+ * for easy implementation.
+ * 
+ * @author Gabriel Einsdorf
+ */
+public interface LocationResolver extends HandlerPlugin<URI> {
+
+	/**
+	 * Resolves the given {@link URI} to a {@link Location}
+	 * 
+	 * @return the resolved Location
+	 * @throws URISyntaxException
+	 */
+	Location resolve(URI uri) throws URISyntaxException;
+}

src/main/java/org/scijava/io/location/LocationService.java

@@ -0,0 +1,86 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2017 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
+ * Institute of Molecular Cell Biology and Genetics, University of
+ * Konstanz, and KNIME GmbH.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.io.location;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import org.scijava.plugin.HandlerService;
+import org.scijava.service.SciJavaService;
+
+/**
+ * A service that allows resolving of URIs to Locations, using
+ * {@link LocationResolver} plugins for translation.
+ * 
+ * @author Gabriel Einsdorf
+ */
+public interface LocationService extends HandlerService<URI, LocationResolver>,
+	SciJavaService
+{
+
+	/**
+	 * Turns the given string into an {@link URI}, then resolves it to a
+	 * {@link Location}
+	 * 
+	 * @param uri the uri to resolve
+	 * @return the resolved {@link Location}
+	 * @throws URISyntaxException if the URI is malformed
+	 */
+	default Location resolve(final String uri) throws URISyntaxException {
+		return resolve(new URI(uri));
+	}
+
+	/**
+	 * Resolves the given {@link URI} to a location.
+	 * 
+	 * @param uri the uri to resolve
+	 * @return the resolved {@link Location} or <code>null</code> if no resolver
+	 *         could be found.
+	 * @throws URISyntaxException if the URI is malformed
+	 */
+	default Location resolve(final URI uri) throws URISyntaxException {
+		final LocationResolver resolver = getResolver(uri);
+		return resolver != null ? resolver.resolve(uri) : null;
+	}
+
+	/**
+	 * Returns a {@link LocationResolver} capable of resolving URL like the one
+	 * provided to this method. Allows faster repeated resolving of similar URIs
+	 * without going through this service.
+	 * 
+	 * @param uri the uri
+	 * @return the {@link LocationResolver} for this uri type, or
+	 *         <code>null</code> if no resolver could be found.
+	 */
+	LocationResolver getResolver(URI uri);
+}

src/test/java/org/scijava/ContextCreationTest.java

@@ -100,6 +100,7 @@ public void testFull() {
 				org.scijava.io.DefaultIOService.class,
 				org.scijava.io.DefaultRecentFileService.class,
 				org.scijava.io.handle.DefaultDataHandleService.class,
+				org.scijava.io.location.DefaultLocationService.class,
 				org.scijava.io.nio.DefaultNIOService.class,
 				org.scijava.main.DefaultMainService.class,
 				org.scijava.menu.DefaultMenuService.class,