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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;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.scijava.AbstractUIDetails;
import org.scijava.Identifiable;
import org.scijava.Locatable;
import org.scijava.ValidityProblem;
import org.scijava.Versioned;
import org.scijava.event.EventService;
import org.scijava.module.event.ModulesUpdatedEvent;
import org.scijava.util.ClassUtils;
import org.scijava.util.ConversionUtils;
import org.scijava.util.VersionUtils;
/**
* Abstract superclass of {@link ModuleInfo} implementation.
*
* By default, {@link ModuleItem}s are stored in {@link HashMap}s and
* {@link ArrayList}s, internally.
*
*
* @author Curtis Rueden
*/
public abstract class AbstractModuleInfo extends AbstractUIDetails implements
ModuleInfo, Identifiable, Locatable, Versioned
{
/** Table of inputs, keyed on name. */
private HashMap> inputMap;
/** Table of outputs, keyed on name. */
private HashMap> outputMap;
/** Ordered list of input items. */
private ArrayList> inputList;
/** Ordered list of output items. */
private ArrayList> outputList;
/** Whether lazy initialization is complete. */
private boolean initialized;
// -- ModuleInfo methods --
@Override
public ModuleItem getInput(final String name) {
return inputMap().get(name);
}
@Override
public ModuleItem getInput(final String name, final Class type) {
return castItem(getInput(name), type);
}
@Override
public ModuleItem getOutput(final String name) {
return outputMap().get(name);
}
@Override
public ModuleItem getOutput(final String name, final Class type) {
return castItem(getOutput(name), type);
}
@Override
public Iterable> inputs() {
return Collections.unmodifiableList(inputList());
}
@Override
public Iterable> outputs() {
return Collections.unmodifiableList(outputList());
}
@Override
public boolean isInteractive() {
return false;
}
@Override
public boolean canPreview() {
return false;
}
@Override
public boolean canCancel() {
return true;
}
@Override
public boolean canRunHeadless() {
return false;
}
@Override
public String getInitializer() {
return null;
}
@Override
public void update(final EventService eventService) {
eventService.publish(new ModulesUpdatedEvent(this));
}
// -- UIDetails methods --
@Override
public String getTitle() {
final String title = super.getTitle();
if (!title.equals(getClass().getSimpleName())) return title;
// use delegate class name rather than actual class name
final String className = getDelegateClassName();
final int dot = className.lastIndexOf(".");
return dot < 0 ? className : className.substring(dot + 1);
}
// -- Validated methods --
@Override
public boolean isValid() {
return true;
}
@Override
public List getProblems() {
return null;
}
// -- Identifiable methods --
@Override
public String getIdentifier() {
// NB: By default, we assume that the delegate class name uniquely
// distinguishes the module from others. If the same delegate class is used
// for more than one module, though, it may need to override this method to
// provide more differentiating details.
return "module:" + getDelegateClassName();
}
// -- Locatable methods --
@Override
public String getLocation() {
// NB: By default, we use the location of the delegate class.
// If the same delegate class is used for more than one module, though,
// it may need to override this method to indicate a different location.
try {
return ClassUtils.getLocation(loadDelegateClass()).toExternalForm();
}
catch (final ClassNotFoundException exc) {
return null;
}
}
// -- Versioned methods --
@Override
public String getVersion() {
// NB: By default, we use the version of the delegate class's JAR archive.
// If the same delegate class is used for more than one module, though,
// it may need to override this method to indicate a different version.
try {
return VersionUtils.getVersion(loadDelegateClass());
}
catch (final ClassNotFoundException exc) {
return null;
}
}
// -- Internal methods --
/**
* Parses input and output parameters. Intended to be overridden by concrete
* subclasses.
*/
protected void parseParameters() {
// NB: Do nothing by default.
}
/** Clears input and output parameters. */
protected void clearParameters() {
inputMap.clear();
outputMap.clear();
inputList.clear();
outputList.clear();
}
/**
* Adds an input. Intended to be called from overridden
* {@link #parseParameters()} methods.
*/
protected void registerInput(final ModuleItem input) {
inputMap.put(input.getName(), input);
inputList.add(input);
}
/**
* Adds an output. Intended to be called from overridden
* {@link #parseParameters()} methods.
*/
protected void registerOutput(final ModuleItem output) {
outputMap.put(output.getName(), output);
outputList.add(output);
}
/** Gets {@link #inputMap}, initializing if needed. */
protected Map> inputMap() {
if (!initialized) initParameters();
return inputMap;
}
/** Gets {@link #inputList}, initializing if needed. */
protected Map> outputMap() {
if (!initialized) initParameters();
return outputMap;
}
/** Gets {@link #outputMap}, initializing if needed. */
protected List> inputList() {
if (!initialized) initParameters();
return inputList;
}
/** Gets {@link #outputList}, initializing if needed. */
protected List> outputList() {
if (!initialized) initParameters();
return outputList;
}
// -- Helper methods --
private ModuleItem castItem(final ModuleItem item,
final Class type)
{
final Class itemType = item.getType();
// if (!type.isAssignableFrom(itemType)) {
final Class saneItemType = ConversionUtils.getNonprimitiveType(itemType);
if (!ConversionUtils.canCast(type, saneItemType)) {
throw new IllegalArgumentException("Type " + type.getName() +
" is incompatible with item of type " + itemType.getName());
}
@SuppressWarnings("unchecked")
final ModuleItem typedItem = (ModuleItem) item;
return typedItem;
}
// -- Helper methods - lazy initialization --
/** Initializes data structures and parses parameters. */
private synchronized void initParameters() {
if (initialized) return; // already initialized
inputMap = new HashMap<>();
outputMap = new HashMap<>();
inputList = new ArrayList<>();
outputList = new ArrayList<>();
parseParameters();
initialized = true;
}
}