TypedIOService interface

src/main/java/org/scijava/io/AbstractTypedIOService.java

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+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2020 SciJava developers.
+ * %%
+ * 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;
+
+import org.scijava.io.location.Location;
+import org.scijava.io.location.LocationService;
+import org.scijava.plugin.AbstractHandlerService;
+import org.scijava.plugin.Parameter;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+
+/**
+ * Abstract base class for typed {@link IOPlugin}s.
+ * 
+ * @author Curtis Rueden
+ * @author Deborah Schmidt
+ */
+public abstract class AbstractTypedIOService<D> extends AbstractHandlerService<Location, IOPlugin<D>> implements TypedIOService<D>
+{
+
+	@Parameter
+	private LocationService locationService;
+
+	@Parameter
+	private IOService ioService;
+
+	@Override
+	public D open(String source) throws IOException {
+		try {
+			return open(locationService.resolve(source));
+		} catch (URISyntaxException e) {
+			throw new IOException(e);
+		}
+	}
+
+	@Override
+	public D open(Location source) throws IOException {
+		IOPlugin<?> opener = ioService().getOpener(source);
+		try {
+			Class<D> ignored = (Class<D>) opener.getDataType();
+			return (D) opener.open(source);
+		}
+		catch(ClassCastException e) {
+			throw new UnsupportedOperationException("No compatible opener found.");
+		}
+	}
+
+	@Override
+	public void save(D data, String destination) throws IOException {
+		try {
+			save(data, locationService.resolve(destination));
+		} catch (URISyntaxException e) {
+			throw new IOException(e);
+		}
+	}
+
+	@Override
+	public void save(D data, Location destination) throws IOException {
+		IOPlugin<D> saver = ioService().getSaver(data, destination);
+		if (saver != null) {
+			saver.save(data, destination);
+		}
+		else {
+			throw new UnsupportedOperationException("No compatible saver found.");
+		}
+	}
+
+	@Override
+	public boolean canOpen(String source) {
+		try {
+			return canOpen(locationService.resolve(source));
+		} catch (URISyntaxException e) {
+			return false;
+		}
+	}
+
+	@Override
+	public boolean canOpen(Location source) {
+		IOPlugin<?> opener = ioService().getOpener(source);
+		if (opener == null) return false;
+		try {
+			Class<D> ignored = (Class<D>) (opener.getDataType());
+			return true;
+		} catch(ClassCastException e) {
+			return false;
+		}
+	}
+
+	@Override
+	public boolean canSave(D data, String source) {
+		try {
+			return canSave(data, locationService.resolve(source));
+		} catch (URISyntaxException e) {
+			return false;
+		}
+	}
+
+	@Override
+	public boolean canSave(D data, Location destination) {
+		IOPlugin<D> saver = ioService.getSaver(data, destination);
+		if (saver == null) return false;
+		return saver.supportsSave(destination);
+	}
+
+	protected LocationService locationService() {
+		return locationService;
+	}
+
+	protected IOService ioService() {
+		return ioService;
+	}
+}

src/main/java/org/scijava/io/TypedIOService.java

@@ -0,0 +1,168 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2020 SciJava developers.
+ * %%
+ * 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;
+
+import java.io.IOException;
+
+import org.scijava.io.location.FileLocation;
+import org.scijava.io.location.Location;
+import org.scijava.plugin.HandlerService;
+import org.scijava.service.SciJavaService;
+
+/**
+ * Interface for high-level data I/O: opening and saving data of a specific type.
+ *
+ * @author Curtis Rueden
+ * @author Deborah Schmidt
+ */
+public interface TypedIOService<D> extends HandlerService<Location, IOPlugin<D>>,
+		SciJavaService
+{
+
+	/**
+	 * Gets the most appropriate {@link IOPlugin} for opening data from the given
+	 * location.
+	 */
+	default IOPlugin<D> getOpener(final String source) {
+		return getOpener(new FileLocation(source));
+	}
+
+	/**
+	 * Gets the most appropriate {@link IOPlugin} for opening data from the given
+	 * location.
+	 */
+	default IOPlugin<D> getOpener(Location source) {
+		for (final IOPlugin<D> handler : getInstances()) {
+			if (handler.supportsOpen(source)) return handler;
+		}
+		return null;
+	}
+
+	/**
+	 * Gets the most appropriate {@link IOPlugin} for saving data to the given
+	 * location.
+	 */
+	default IOPlugin<D> getSaver(final D data, final String destination) {
+		return getSaver(data, new FileLocation(destination));
+	}
+
+	/**
+	 * Gets the most appropriate {@link IOPlugin} for saving data to the given
+	 * location.
+	 */
+	default IOPlugin<D> getSaver(D data, Location destination) {
+		for (final IOPlugin<?> handler : getInstances()) {
+			if (handler.supportsSave(data, destination)) {
+				return (IOPlugin<D>) handler;
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Loads data from the given source. For extensibility, the nature of the
+	 * source is left intentionally general, but two common examples include file
+	 * paths and URLs.
+	 * <p>
+	 * The opener to use is automatically determined based on available
+	 * {@link IOPlugin}s; see {@link #getOpener(String)}.
+	 * </p>
+	 *
+	 * @param source The source (e.g., file path) from which to data should be
+	 *          loaded.
+	 * @return An object representing the loaded data, or null if the source is
+	 *         not supported.
+	 * @throws IOException if something goes wrong loading the data.
+	 */
+	D open(String source) throws IOException;
+
+	/**
+	 * Loads data from the given location.
+	 * <p>
+	 * The opener to use is automatically determined based on available
+	 * {@link IOPlugin}s; see {@link #getOpener(Location)}.
+	 * </p>
+	 *
+	 * @param source The location from which to data should be loaded.
+	 * @return An object representing the loaded data, or null if the source is
+	 *         not supported.
+	 * @throws IOException if something goes wrong loading the data.
+	 */
+	D open(Location source) throws IOException;
+
+	/**
+	 * Saves data to the given destination. The nature of the destination is left
+	 * intentionally general, but the most common example is a file path.
+	 * <p>
+	 * The saver to use is automatically determined based on available
+	 * {@link IOPlugin}s; see {@link #getSaver(Object, String)}.
+	 * </p>
+	 *
+	 * @param data The data to be saved to the destination.
+	 * @param destination The destination (e.g., file path) to which data should
+	 *          be saved.
+	 * @throws IOException if something goes wrong saving the data.
+	 */
+	void save(D data, String destination) throws IOException;
+
+	/**
+	 * Saves data to the given location.
+	 * <p>
+	 * The saver to use is automatically determined based on available
+	 * {@link IOPlugin}s; see {@link #getSaver(Object, Location)}.
+	 * </p>
+	 *
+	 * @param data The data to be saved to the destination.
+	 * @param destination The destination location to which data should be saved.
+	 * @throws IOException if something goes wrong saving the data.
+	 */
+	void save(D data, Location destination) throws IOException;
+
+	boolean canOpen(String source);
+
+	boolean canOpen(Location source);
+
+	boolean canSave(D data, String destination);
+
+	boolean canSave(D data, Location destination);
+
+	// -- HandlerService methods --
+
+	@Override
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	default Class<IOPlugin<D>> getPluginType() {
+		return (Class) IOPlugin.class;
+	}
+
+	@Override
+	default Class<Location> getType() {
+		return Location.class;
+	}
+}

src/main/java/org/scijava/text/io/DefaultTextIOService.java

@@ -0,0 +1,43 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2020 SciJava developers.
+ * %%
+ * 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.text.io;
+
+import org.scijava.io.AbstractTypedIOService;
+import org.scijava.plugin.Plugin;
+import org.scijava.service.Service;
+
+/**
+ * Default {@link TextIOService} implementation for opening and saving text data
+ *
+ * @author Deborah Schmidt
+ */
+@Plugin(type = Service.class)
+public class DefaultTextIOService extends AbstractTypedIOService<String> implements TextIOService {
+}

src/main/java/org/scijava/text/io/TextIOService.java

@@ -0,0 +1,40 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2020 SciJava developers.
+ * %%
+ * 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.text.io;
+
+import org.scijava.io.TypedIOService;
+
+/**
+ * {@link TypedIOService} for opening and saving text data
+ *
+ * @author Deborah Schmidt
+ */
+public interface TextIOService extends TypedIOService<String> {
+}