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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, 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
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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package org.scijava.ui;
import java.io.File;
import org.scijava.module.Module;
import org.scijava.module.ModuleItem;
import org.scijava.module.process.AbstractPreprocessorPlugin;
import org.scijava.module.process.PreprocessorPlugin;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.widget.InputHarvester;
@Plugin(type = PreprocessorPlugin.class, priority = InputHarvester.PRIORITY + 1.0)
public class FileListPreprocessor extends AbstractPreprocessorPlugin {
@Parameter(required = false)
private UIService uiService;
@Override
public void process(final Module module) {
if (uiService == null) return;
final ModuleItem fileInput = getFilesInput(module);
if (fileInput == null) return;
final File[] files = fileInput.getValue(module);
// show file chooser dialog box
// TODO decide how to create filter from style attributes
// TODO retrieve parent folder??
final File[] result = uiService.chooseFiles(null, files, null, fileInput.getWidgetStyle());
if (result == null) {
cancel("");
return;
}
fileInput.setValue(module, result);
module.resolveInput(fileInput.getName());
}
// -- Helper methods --
/**
* Gets the single unresolved {@link File} input parameter. If there is not
* exactly one unresolved {@link File} input parameter, or if there are other
* types of unresolved parameters, this method returns null.
*/
private ModuleItem getFilesInput(final Module module) {
ModuleItem result = null;
for (final ModuleItem input : module.getInfo().inputs()) {
if (module.isInputResolved(input.getName())) continue;
final Class type = input.getType();
if (!File[].class.isAssignableFrom(type)) {
// not a File[] parameter; abort
return null;
}
if (result != null) {
// second File parameter; abort
return null;
}
@SuppressWarnings("unchecked")
final ModuleItem fileInput = (ModuleItem) input;
result = fileInput;
}
return result;
}
}