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IOService recognizes a new 3rd state of loading data by xulman · Pull Request #430 · scijava/scijava-common · GitHub

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IOService recognizes a new 3rd state of loading data #430

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IOService recognizes a new 3rd state of loading data #430

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27 changes: 23 additions & 4 deletions src/main/java/org/scijava/io/IOService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,15 @@ default <D> IOPlugin<D> getSaver(D data, Location destination) {
return null;
}

/** A special type of "openned data" that can be returned by the
* {@link #open(String)} and {@link #open(Location)} methods, and
* that signals that data is opened outside the ImageJ2 data model.
* Example is the opening of BigDataViewer's .xml files, in which case
* no image is actually loaded into ImageJ2 per se, but an instance of
* the BigDataViewer over the .xml file is opened/started instead.
*/
Object GOVERNING_APP_STARTED = new Object();

/**
* Loads data from the given source. For extensibility, the nature of the
* source is left intentionally general, but two common examples include file
Expand All @@ -95,11 +104,16 @@ default <D> IOPlugin<D> getSaver(D data, Location destination) {
* The opener to use is automatically determined based on available
* {@link IOPlugin}s; see {@link #getOpener(String)}.
* </p>
* The opener may open the source in "external" application (e.g., in BigDataViewer)
* in which case it must return {@link #GOVERNING_APP_STARTED} object (and not the
* source data itself).
* </p>
*
* @param source The source (e.g., file path) from which to data should be
* loaded.
* @return An object representing the loaded data, or null if the source is
* not supported.
* @return An object representing the loaded data, or {@link #GOVERNING_APP_STARTED}
* object signalling that the source was loaded into an external application,
* or null if the source is not supported.
* @throws IOException if something goes wrong loading the data.
*/
Object open(String source) throws IOException;
Expand All @@ -110,10 +124,15 @@ default <D> IOPlugin<D> getSaver(D data, Location destination) {
* The opener to use is automatically determined based on available
* {@link IOPlugin}s; see {@link #getOpener(Location)}.
* </p>
* The opener may open the source in "external" application (e.g., in BigDataViewer)
* in which case it must return {@link #GOVERNING_APP_STARTED} object (and not the
* source data itself).
* </p>
*
* @param source The location from which to data should be loaded.
* @return An object representing the loaded data, or null if the source is
* not supported.
* @return An object representing the loaded data, or {@link #GOVERNING_APP_STARTED}
* object signalling that the source was loaded into an external application,
* or null if the source is not supported.
* @throws IOException if something goes wrong loading the data.
*/
default Object open(Location source) throws IOException {
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