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Difference between revisions of "FAQ How do I find out the install location of a plug-in?"
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| − | You should generally avoid making assumptions about the location of a plug-in | + | You should generally avoid making assumptions about the location of a plug-in at runtime. To find resources, such as images, that are stored in your plug-in’s install directory, you can use URLs provided by the <tt>Platform</tt> class. These URLs use a special Eclipse Platform protocol, but if you are using them only to read files, it does not matter. |
| − | at runtime. To find resources, such as images, that are stored in your plug-in’s | + | |
| − | install directory, you can use URLs provided by the <tt>Platform</tt> class. | + | |
| − | These URLs use a special Eclipse Platform protocol, but if you are | + | |
| − | using them only to read files, it does not matter. | + | |
| − | In Eclipse 3.1 and earlier, the following snippet | + | In Eclipse 3.1 and earlier, the following snippet opens an input stream on a file called <tt>sample.gif</tt> located in a subdirectory, called <tt>icons</tt>, of a plug-in’s install directory: |
| − | opens an input stream on a file called <tt>sample.gif</tt> located | + | |
| − | in a subdirectory, called <tt>icons</tt>, of a plug-in’s install directory: | + | |
<pre> | <pre> | ||
| Line 16: | Line 10: | ||
</pre> | </pre> | ||
| − | If you need to know the file system location of a plug-in, you need to | + | If you need to know the file system location of a plug-in, you need to use <tt>Platform.resolve(URL)</tt>. This method converts a platform URL to a standard URL protocol, such as HyperText Transfer Protocol (HTTP), or file. Note that the Eclipse Platform does not specify that plug-ins must exist in the local file system, so you cannot rely on this method’s returning a file system URL under all circumstances in the future. |
| − | use <tt>Platform.resolve(URL)</tt>. This method converts a | + | |
| − | platform URL to a standard URL protocol, such as HyperText | + | |
| − | Transfer Protocol (HTTP), or file. Note | + | |
| − | that the Eclipse Platform does not specify that plug-ins | + | |
| − | must exist in the local file system, so you cannot rely on this | + | |
| − | method’s returning a file system URL under all circumstances in the future. | + | |
In Eclipse 3.2, the preferred method seems to be: | In Eclipse 3.2, the preferred method seems to be: | ||
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== See Also: == | == See Also: == | ||
| − | *[[ | + | *[[FAQ Where do plug-ins store their state?]] |
| − | + | {{Template:FAQ_Tagline}} | |
Revision as of 20:28, 19 June 2006
You should generally avoid making assumptions about the location of a plug-in at runtime. To find resources, such as images, that are stored in your plug-in’s install directory, you can use URLs provided by the Platform class. These URLs use a special Eclipse Platform protocol, but if you are using them only to read files, it does not matter.
In Eclipse 3.1 and earlier, the following snippet opens an input stream on a file called sample.gif located in a subdirectory, called icons, of a plug-in’s install directory:
Bundle bundle = Platform.getBundle(yourPluginId);
Path path = new Path("icons/sample.gif");
URL fileURL = Platform.find(bundle, path);
InputStream in = fileURL.openStream();
If you need to know the file system location of a plug-in, you need to use Platform.resolve(URL). This method converts a platform URL to a standard URL protocol, such as HyperText Transfer Protocol (HTTP), or file. Note that the Eclipse Platform does not specify that plug-ins must exist in the local file system, so you cannot rely on this method’s returning a file system URL under all circumstances in the future.
In Eclipse 3.2, the preferred method seems to be:
Bundle bundle = Platform.getBundle(yourPluginId);
Path path = new Path("icons/sample.gif");
URL fileURL = FileLocator.find(bundle, path, null);
InputStream in = fileURL.openStream();
See Also:
This FAQ was originally published in Official Eclipse 3.0 FAQs. Copyright 2004, Pearson Education, Inc. All rights reserved. This text is made available here under the terms of the Eclipse Public License v1.0.