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org.netbeans.modules.editor.mimelookup/1 1.40

MIME Lookup API
Official

It consists of MimeLookupAPI in org.netbeans.api.editor.mimelookup MimeLookupSPI in org.netbeans.spi.editor.mimelookup

See: Description

MIME Lookup API 
Package Description
org.netbeans.api.editor.mimelookup  
org.netbeans.spi.editor.mimelookup
The SPI allows registering providers of mime type specific Lookups.

It consists of

API contains only two classes:

1. org.netbeans.api.editor.mimelookup.MimeLookup with public methods:
2. org.netbeans.api.editor.mimelookup.MimePath with public methods:

MimeLookup is represented via ProxyLookup that collects registered lookups. Particular lookups, responsible for looking up their objects can be registered using interface MimeDataProvider into default lookup by META-INF/services registration. Previously used registration via interface MimeLookupInitializer was deprecated.

In addition to this basic registration, xml layer folder registration is also available. It is provided by registering implemented interface Class2LayerFolder into default lookup via META-INF/services registration. This approach provides a mapping of class to specific subfolder. Using this mapping one can achieve the convenient way of using MimeLookup e.g.

MimeLookup.getMimeLookup("text/x-java").lookup(FoldManagerFactory.class);

Using this, an instance of FoldManagerFactory is retrieved from the folder with path "Editors/text/x-java/FoldManager" provided that FoldManagerFactory.class is registered to a subfolder "FoldManager" via Class2LayerFolder registration.

There InstanceProvider can be used if there are files of various types in the layer folder that need additional handling before becoming and instance of certain class. For more details look at use case of PopupActions creation.

The Javadoc documentation can be generated by using

    cd /cvs/editor/mimelookup
    ant javadoc

What is New (see all changes)?

Use Cases

Per mime-type operation
Operation of the editor module must be parametrized by the type of the file being edited. In the past the operation was parametrized by the class of the editor kit but that did not show up as being useful enough.
It is more practical to use a string-based parametrization concretely the mime-type. Anyone can then easily register an additional functionality for the editor because it's just enough to know the right mime-type and the type of the functionality class to be implemented and the xml layer folder where the class should be registered.
Provide list of instances as lookup result
On the modules' implementation side the registered functionality must be retrieved somehow. It's necessary to instantiate the registered objects and react to module enabling/disabling which can affect validity of the registered objects.
As the most convenient solution appears to use org.openide.util.Lookup allowing to provide the registered instances as a Lookup.Result allowing to listen for changes (e.g. caused by the module enabling/disabling).
This resulted into creation of class MimeLookup extends Lookup containing static MimeLookup getMimeLookup(String mimeType).
Nested mime-types
On the lexical level the document can contain nested languages.
For example JSP document can contain pieces of java code which can further contain javadoc comment tokens with nested javadoc language.
The nested languages should allow for special settings such as fonts and colors of nested syntax coloring but even things like actions that would be active in the nested document section.
This resulted into creation of static Lookup getLookup(MimePath mimePath) method in MimeLookup.
Known clients summary
Fold Manager Factories
The editor/fold module expects to find the registered fold manager factories (org.netbeans.spi.editor.fold.FoldManagerFactory classes).

Completion Providers
The editor/completion module expects to find the registered completion providers (org.netbeans.spi.editor.completion.CompletionProvider classes).

Editor Context Menu Actions
The editor module expects to find the registered popup menu actions (javax.swing.Action classes or names of actions (i.e. value of Action.NAME attribute) present in editor kit e.g. "goto-source").

Side Bars
The editor/lib module expects to find factories for components to be placed on the sides of the editor component (org.netbeans.editor.SideBarFactory classes).

Hyperlink Providers
The editor/lib module expects to find hyperlink providers that allow connecting an open document with some other documents (org.netbeans.lib.editor.hyperlink.spi.HyperlinkProvider classes).

Code Template Processors
The editor/codetemplates module expects to find factories for code template processors (org.netbeans.lib.editor.codetemplates.spi.CodeTemplateProcessorFactory classes).

Hints Providers
The editor/hints module expects to find editor hints providers (org.netbeans.modules.editor.hints.spi.HintsProvider classes).


API Use Cases
Find class instances for the given mime-type
An API method

MimeLookup lookup = MimeLookup.getMimeLookup("text/x-java");

can be used for getting the mime specific lookup. Having this we can lookup class or template:

Object obj = lookup.lookup(LookedUpClass.class);

or

Lookup.Result result = lookup.lookup(new Lookup.Template(LookedUpClass.class));
Getting embeded mime-type specific Lookup
As an example a jsp scriptlet is used. Scriptlet in fact consists of parent "text/x-jsp" mime-type and embeded "text/x-java" mime-type. To obtain a scriptlet lookup firstly we need to get a MimePath and then get appropriate lookup:

    MimePath scriptletPath = MimePath.parse("text/x-jsp/text/x-java");
    Lookup lookup = MimeLookup.getLookup(scriptletPath);

SPI Use Cases
Providing implemented MimeLookupInitializer
It is the general way of adding mime specific object into the MimeLookup. Implementation of MimeLookupInitializer should be created and registered to default lookup via META-INF/services registration. For details, please look at the simplified TestMimeLookupInitializer in mimelookup/test/unit or LayerMimeLookupInitializer. Usage of MimeLookupInitializer is deprecated, please use MimeDataProvider instead in similar way

Exported Interfaces

This table lists all of the module exported APIs with defined stability classifications. It is generated based on answers to questions about the architecture of the module. Read them all...
Group of java interfaces
Interface NameIn/OutStabilitySpecified in What Document?
MimeLookupAPIExportedOfficial
MimeLookupSPIExportedOfficial

Group of systemproperty interfaces
Interface NameIn/OutStabilitySpecified in What Document?

Implementation Details

Where are the sources for the module?
Sources can be found in editor/mimelookup module.

The default answer to this question is:

The sources for the module are in the NetBeans Mercurial repositories.

What do other modules need to do to declare a dependency on this one, in addition to or instead of a plain module dependency?
Nothing.

Read more about the implementation in the answers to architecture questions.

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