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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.
/*
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* SciJava Common shared library for SciJava software.
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* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
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* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer.
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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;
/**
* A preprocessor plugin that handles single unresolved parameters of type
* {@link File} using a UI prompt.
*
* @author Curtis Rueden
* @see UserInterface#chooseFile(File, String)
*/
@Plugin(type = PreprocessorPlugin.class,
priority = InputHarvester.PRIORITY + 0.5)
public class FilePreprocessor extends AbstractPreprocessorPlugin {
@Parameter(required = false)
private UIService uiService;
// -- ModuleProcessor methods --
@Override
public void process(final Module module) {
if (uiService == null) return;
final ModuleItem fileInput = getFileInput(module);
if (fileInput == null) return;
final File file = fileInput.getValue(module);
final String style = fileInput.getWidgetStyle();
// show file chooser dialog box
final File result = uiService.chooseFile(file, style);
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 getFileInput(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;
}
}