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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.
/*
* #%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, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* 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.
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.scijava.display;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.scijava.Named;
import org.scijava.Priority;
import org.scijava.log.LogService;
import org.scijava.module.Module;
import org.scijava.module.ModuleItem;
import org.scijava.module.process.AbstractPostprocessorPlugin;
import org.scijava.module.process.PostprocessorPlugin;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
/**
* Displays outputs upon completion of a module execution.
*
* @author Curtis Rueden
* @author Lee Kamentsky
* @author Barry DeZonia
*/
@Plugin(type = PostprocessorPlugin.class,
priority = Priority.VERY_LOW_PRIORITY)
public class DisplayPostprocessor extends AbstractPostprocessorPlugin {
@Parameter(required = false)
private DisplayService displayService;
@Parameter(required = false)
private LogService log;
@Override
public void process(final Module module) {
if (displayService == null) return;
for (final ModuleItem outputItem : module.getInfo().outputs()) {
if (module.isOutputResolved(outputItem.getName())) continue;
final Object value = outputItem.getValue(module);
final String name = defaultName(outputItem);
final boolean resolved = handleOutput(name, value);
if (resolved) module.resolveOutput(name);
}
}
// -- Helper methods --
/**
* Displays output objects.
*
* @param defaultName The default name for the display, if not already set.
* @param output The object to display.
*/
private boolean handleOutput(final String defaultName, final Object output) {
if (output == null) return false; // ignore null outputs
if (output instanceof Display) {
// output is itself a display; just update it
final Display display = (Display) output;
display.update();
return true;
}
final boolean addToExisting = addToExisting(output);
final ArrayList> displays = new ArrayList<>();
// get list of existing displays currently visualizing this output
final List> existingDisplays =
displayService.getDisplays(output);
displays.addAll(existingDisplays);
if (displays.isEmpty()) {
// output was not already displayed
final Display activeDisplay = displayService.getActiveDisplay();
if (addToExisting && activeDisplay.canDisplay(output)) {
// add output to existing display if possible
activeDisplay.display(output);
displays.add(activeDisplay);
}
else {
// create a new display for the output
String name = null;
// TODO rework how displays are named
if (output instanceof Named) name = ((Named)output).getName();
if (name == null) name = defaultName;
final Display display = displayService.createDisplay(name, output);
if (display != null) {
displays.add(display);
}
}
}
if (!displays.isEmpty()) {
// output was successfully associated with at least one display
for (final Display display : displays) {
display.update();
}
return true;
}
if (output instanceof Map) {
// handle each item of the map separately
final Map map = (Map) output;
for (final Object key : map.keySet()) {
final String itemName = key.toString();
final Object itemValue = map.get(key);
handleOutput(itemName, itemValue);
}
return true;
}
if (output instanceof Collection) {
// handle each item of the collection separately
final Collection collection = (Collection) output;
for (final Object item : collection) {
handleOutput(defaultName, item);
}
return true;
}
// no available displays for this type of output
if (log != null) {
final String valueClass = output.getClass().getName();
log.warn("Ignoring unsupported output: " + defaultName + " [" +
valueClass + "]");
}
return false;
}
private boolean addToExisting(final Object output) {
// TODO - find a general way to decide this
// Current thinking is that with the pending display refactoring, each
// display will stop being a list and instead handle a single object.
// Once that happens, the idea of adding a new output to an existing display
// will largely disappear, obviating the need for this logic. In the case
// of images specifically there could be another PostprocessorPlugin that
// handles that special case in some fashion, though.
return false;
}
private String defaultName(final ModuleItem item) {
final String label = item.getLabel();
if (label != null && !label.isEmpty()) return label;
final String name = item.getName();
if (name != null && !name.isEmpty()) return name;
return "Unnamed";
}
}