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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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package org.scijava.module.process;
import org.scijava.convert.ConvertService;
import org.scijava.module.Module;
import org.scijava.module.ModuleItem;
import org.scijava.module.ModuleService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.util.ConversionUtils;
import org.scijava.widget.InputHarvester;
/**
* A preprocessor for loading populated input values from persistent storage.
*
* This preprocessor runs late in the chain, to give other preprocessors a
* chance to populate the inputs first. However, its priority immediately
* precedes the {@link org.scijava.widget.InputHarvester}'s, so that user-specified
* values from last time are populated in the user dialog.
*
*
* @author Curtis Rueden
*/
@Plugin(type = PreprocessorPlugin.class,
priority = InputHarvester.PRIORITY + 1)
public class LoadInputsPreprocessor extends AbstractPreprocessorPlugin {
@Parameter
private ModuleService moduleService;
@Parameter
private ConvertService conversionService;
// -- ModuleProcessor methods --
@Override
public void process(final Module module) {
final Iterable> inputs = module.getInfo().inputs();
for (final ModuleItem item : inputs) {
loadValue(module, item);
}
}
// -- Helper methods --
/** Loads the value of the given module item from persistent storage. */
private void loadValue(final Module module, final ModuleItem item) {
// skip input that has already been resolved
if (module.isResolved(item.getName())) return;
final T prefValue = moduleService.load(item);
final Class type = item.getType();
final T defaultValue = item.getValue(module);
final T value = getBestValue(prefValue, defaultValue, type);
item.setValue(module, value);
}
private T getBestValue(final Object prefValue,
final Object defaultValue, final Class type)
{
if (prefValue != null) return conversionService.convert(prefValue, type);
if (defaultValue != null) {
return conversionService.convert(defaultValue, type);
}
return ConversionUtils.getNullValue(type);
}
}