Incremental Project Builders
The workspace supports the notion of an incremental
project builder (or "builder" for short"). The job
of a builder is to process a set of resource changes
(supplied as a resource delta). For example, a Java
builder would recompile changed Java files and produce
new class files.
Builders are configured on a per-project basis and run
automatically when resources within their project are
changed. As such, builders should be fast and scale
with respect to the amount of change rather than the
number of resources in the project. This typically
implies that builders are able to incrementally update
their "built state".
The builders extension-point allows builder writers
to register their builder implementation under a
symbolic name that is then used from within the
workspace to find and run builders. The symbolic
name is the id of the builder extension. When defining a builder extension, users are encouraged to include a human-readable value for the "name" attribute which identifies their builder and potentially may be presented to users.
<!ELEMENT extension (
point CDATA #REQUIRED
id CDATA #REQUIRED
name CDATA #IMPLIED
point - a fully qualified identifier of the target extension point
id - an optional identifier of the extension instance
name - an optional name of the extension instance
<!ELEMENT builder (
hasNature (true | false)
isConfigurable (true | false)
callOnEmptyDelta (true | false)
hasNature - "true" or "false" indicating whether the builder is owned by
a project nature. If "true" and no corresponding nature is
found, this builder will not run but will remain in the project's
build spec. If the attribute is not specified, it is assumed to be "false".
isConfigurable - "true" or "false" indicating whether the builder allows customization of what build triggers it will respond to. If "true", clients will be able to use the API ICommand.setBuilding to specify if this builder should be run for a particular build trigger. If the attribute is not specified, it is assumed to be "false".
callOnEmptyDelta - "true" or "false" indicating whether the builder should be called on INCREMENTAL_BUILD when the resource deltas for its affected projects are empty. If "true", the builder will always be called on builds of type INCREMENTAL_BUILD, regardless of whether any resources in the affected projects have changed. If "false" or unspecified, the builder will only be called when affected projects have changed. The value of this attribute does not affect the behaviour of builders for other build triggers, such as AUTO_BUILD or FULL_BUILDThis attribute is intended to be used by builders that incrementally react to changing circumstances outside of the workspace, such as external libraries.
<!ELEMENT run (
class CDATA #REQUIRED
class - the fully-qualified name of a subclass of
<!ELEMENT parameter EMPTY>
name CDATA #REQUIRED
value CDATA #REQUIRED
name - the name of this parameter made available to
instances of the specified builder class
value - an arbitrary value associated with the given
name and made available to instances of the
specified builder class
Following is an example of a builder configuration:
"Produced by the Cool Builder"
If this extension was defined in a plug-in with id "com.xyz.coolplugin", the fully qualified name of this builder would be "com.xyz.coolplugin.coolbuilder".
The platform itself does not have any predefined
builders. Particular product installs may include
builders as required.
Copyright (c) 2002, 2006 IBM Corporation and others.
All rights reserved. This program and the accompanying materials are made
available under the terms of the Eclipse Public License v1.0 which
accompanies this distribution, and is available at