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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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package org.scijava.module;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.List;
import org.scijava.BasicDetails;
import org.scijava.ItemIO;
import org.scijava.ItemVisibility;
/**
* A ModuleItem represents metadata about one input or output of a module.
*
* @author Aivar Grislis
* @author Curtis Rueden
*/
public interface ModuleItem extends BasicDetails {
/** Gets the {@link ModuleInfo} to which this item belongs. */
ModuleInfo getInfo();
/** Gets the type of the item. */
Class getType();
/**
* Gets the type of the item, including Java generic parameters.
*
* For many modules, this may be the same {@link Class} object returned by
* {@link #getType()}, but some module inputs or outputs may be backed by a
* generic type such as {@code List} or {@code Iterable}.
*
*
* @see Field#getGenericType()
*/
Type getGenericType();
/** Gets the input/output type of the item. */
ItemIO getIOType();
/** Gets whether the item is a module input. */
boolean isInput();
/** Gets whether the item is a module output. */
boolean isOutput();
/** Gets the visibility of the item. */
ItemVisibility getVisibility();
/** Gets whether the item value is allowed to be auto-filled. */
boolean isAutoFill();
/** Gets whether the item value must be specified (i.e., no default). */
boolean isRequired();
/** Gets whether to remember the most recent value of the parameter. */
boolean isPersisted();
/** Gets the key to use for saving the value persistently. */
String getPersistKey();
/**
* Loads the item's persisted value. This recalls the value last stored using
* {@link #saveValue(Object)}.
*
* Note that this is different than obtaining a module instance's current
* value for the input; see {@link #getValue(Module)} for that.
*
*
* @deprecated
* @see ModuleService#load(ModuleItem)
*/
@Deprecated
T loadValue();
/**
* Saves the given value to persistent storage. This allows later restoration
* of the value via {@link #loadValue()}, even from a different JVM.
*
* @deprecated
* @see ModuleService#save(ModuleItem, Object)
*/
@Deprecated
void saveValue(T value);
/** Gets the function that is called to initialize the item's value. */
String getInitializer();
/**
* Invokes this item's initializer function, if any, on the given module.
*
* @see #getInitializer()
*/
void initialize(Module module) throws MethodCallException;
/**
* Gets the function that is called whenever this item changes.
*
* This mechanism enables interdependent items of various types. For example,
* two int parameters "width" and "height" could update each other when
* another boolean "Preserve aspect ratio" flag is set.
*
*/
String getCallback();
/**
* Invokes this item's callback function, if any, on the given module.
*
* @see #getCallback()
*/
void callback(Module module) throws MethodCallException;
/**
* Gets the preferred widget style to use when rendering the item in a user
* interface.
*/
String getWidgetStyle();
/** Gets the default value. */
T getDefaultValue();
/** Gets the minimum allowed value (if applicable). */
T getMinimumValue();
/** Gets the maximum allowed value (if applicable). */
T getMaximumValue();
/**
* Gets the "soft" minimum value (if applicable).
*
* The soft minimum is a hint for use in bounded scenarios, such as rendering
* in a user interface with a slider or scroll bar widget; the parameter value
* will not actually be clamped to the soft bounds, but they may be used in
* certain circumstances where appropriate.
*
*/
T getSoftMinimum();
/**
* Gets the "soft" maximum value (if applicable).
*
* The soft maximum is a hint for use in bounded scenarios, such as rendering
* in a user interface with a slider or scroll bar widget; the parameter value
* will not actually be clamped to the soft bounds, but they may be used in
* certain circumstances where appropriate.
*
*/
T getSoftMaximum();
/**
* Gets the preferred step size to use when rendering the item in a user
* interface (if applicable).
*/
Number getStepSize();
/**
* Gets the preferred width of the input field in characters (if applicable).
*/
int getColumnCount();
/** Gets the list of possible values. */
List getChoices();
/** Gets the item's current value with respect to the given module. */
T getValue(Module module);
/** Sets the item's current value with respect to the given module. */
void setValue(Module module, T value);
}