Eclipse Plug-in Developer Guide (Galileo) - IncrementalProjectBuilder (Eclipse Platform API Specification)

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Eclipse Platform
Release 3.5

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org.eclipse.core.resources
Class IncrementalProjectBuilder


java.lang.Object
  org.eclipse.core.internal.events.InternalBuilder
      
org.eclipse.core.resources.IncrementalProjectBuilder

All Implemented Interfaces:: IExecutableExtension

public abstract class IncrementalProjectBuilder
extends org.eclipse.core.internal.events.InternalBuilder
implements IExecutableExtension
extends org.eclipse.core.internal.events.InternalBuilder
implements IExecutableExtension

The abstract base class for all incremental project builders. This class provides the infrastructure for defining a builder and fulfills the contract specified by the org.eclipse.core.resources.builders standard extension point.

All builders must subclass this class according to the following guidelines:

must re-implement at least build
may implement other methods
must supply a public, no-argument constructor

On creation, the setInitializationData method is called with any parameter data specified in the declaring plug-in's manifest.

Field Summary

static int AUTO_BUILD
          Build kind constant (value 9) indicating an automatic build request.

static int CLEAN_BUILD
          Build kind constant (value 15) indicating a clean build request.

static int FULL_BUILD
          Build kind constant (value 6) indicating a full build request.

static int INCREMENTAL_BUILD
          Build kind constant (value 10) indicating an incremental build request.

Constructor Summary

IncrementalProjectBuilder ()


Method Summary

protected abstract IProject[] build (int kind, Map args, IProgressMonitor monitor)
          Runs this builder in the specified manner.

protected void clean ( IProgressMonitor monitor)
          Clean is an opportunity for a builder to discard any additional state that has been computed as a result of previous builds.

void forgetLastBuiltState ()
          Requests that this builder forget any state it may be retaining regarding previously built states.

ICommand getCommand ()
          Returns the build command associated with this builder.

IResourceDelta getDelta ( IProject project)
          Returns the resource delta recording the changes in the given project since the last time this builder was run.

IProject getProject ()
          Returns the project for which this builder is defined.

ISchedulingRule getRule ()
          Returns the scheduling rule that is required for building the project for which this builder is defined.

boolean hasBeenBuilt ( IProject project)
          Returns whether the given project has already been built during this build iteration.

boolean isInterrupted ()
          Returns whether an interrupt request has been made for this build.

void needRebuild ()
          Indicates that this builder made changes that affect a project that precedes this project in the currently executing build order, and thus a rebuild will be necessary.

void setInitializationData ( IConfigurationElement config, String propertyName, Object data)
          Sets initialization data for this builder.

protected void startupOnInitialize ()
          Informs this builder that it is being started by the build management infrastructure.

Methods inherited from class java.lang. Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FULL_BUILD

public static final int FULL_BUILD

Build kind constant (value 6) indicating a full build request. A full build discards all previously built state and builds all resources again. Resource deltas are not applicable for this kind of build.

See Also:: IProject.build(int, IProgressMonitor), IProject.build(int, String, Map, IProgressMonitor), IWorkspace.build(int, IProgressMonitor), Constant Field Values

AUTO_BUILD

public static final int AUTO_BUILD

Build kind constant (value 9) indicating an automatic build request. When autobuild is turned on, these builds are triggered automatically whenever resources change. Apart from the method by which autobuilds are triggered, they otherwise operate like an incremental build.

See Also:: IWorkspaceDescription.setAutoBuilding(boolean), IWorkspace.isAutoBuilding(), Constant Field Values

INCREMENTAL_BUILD

public static final int INCREMENTAL_BUILD

Build kind constant (value 10) indicating an incremental build request. Incremental builds use an IResourceDelta that describes what resources have changed since the last build. The builder calculates what resources are affected by the delta, and rebuilds the affected resources.

See Also:: IProject.build(int, IProgressMonitor), IProject.build(int, String, Map, IProgressMonitor), IWorkspace.build(int, IProgressMonitor), Constant Field Values

CLEAN_BUILD

public static final int CLEAN_BUILD

Build kind constant (value 15) indicating a clean build request. A clean build discards any additional state that has been computed as a result of previous builds, and returns the project to a clean slate. Resource deltas are not applicable for this kind of build.

Since:: 3.0
See Also:: IProject.build(int, IProgressMonitor), IProject.build(int, String, Map, IProgressMonitor), IWorkspace.build(int, IProgressMonitor), clean(IProgressMonitor), Constant Field Values

Constructor Detail

IncrementalProjectBuilder

public IncrementalProjectBuilder()

Method Detail

build

protected abstract 
IProject[] build(int kind,
                                    
Map args,
                                    
IProgressMonitor monitor)
                             throws 
CoreException

Runs this builder in the specified manner. Subclasses should implement this method to do the processing they require.

If the build kind is INCREMENTAL_BUILD or AUTO_BUILD, the getDelta method can be used during the invocation of this method to obtain information about what changes have occurred since the last invocation of this method. Any resource delta acquired is valid only for the duration of the invocation of this method.

After completing a build, this builder may return a list of projects for which it requires a resource delta the next time it is run. This builder's project is implicitly included and need not be specified. The build mechanism will attempt to maintain and compute deltas relative to the identified projects when asked the next time this builder is run. Builders must re-specify the list of interesting projects every time they are run as this is not carried forward beyond the next build. Projects mentioned in return value but which do not exist will be ignored and no delta will be made available for them.

This method is long-running; progress and cancellation are provided by the given progress monitor. All builders should report their progress and honor cancel requests in a timely manner. Cancelation requests should be propagated to the caller by throwing OperationCanceledException.

All builders should try to be robust in the face of trouble. In situations where failing the build by throwing CoreException is the only option, a builder has a choice of how best to communicate the problem back to the caller. One option is to use the IResourceStatus.BUILD_FAILED status code along with a suitable message; another is to use a MultiStatus containing finer-grained problem diagnoses.

Specified by:: build in class org.eclipse.core.internal.events.InternalBuilder

Parameters:

kind - the kind of build being requested. Valid values are

FULL_BUILD - indicates a full build.
INCREMENTAL_BUILD- indicates an incremental build.
AUTO_BUILD - indicates an automatically triggered incremental build (autobuilding on).

args - a table of builder-specific arguments keyed by argument name (key type: String, value type: String); null is equivalent to an empty map

monitor - a progress monitor, or null if progress reporting and cancellation are not desired

Returns:

the list of projects for which this builder would like deltas the next time it is run or null if none

Throws:


CoreException

- if this build fails.

clean

protected void clean(
IProgressMonitor monitor)
              throws 
CoreException

Clean is an opportunity for a builder to discard any additional state that has been computed as a result of previous builds. It is recommended that builders override this method to delete all derived resources created by previous builds, and to remove all markers of type IMarker.PROBLEM that were created by previous invocations of the builder. The platform will take care of discarding the builder's last built state (there is no need to call forgetLastBuiltState).

This method is called as a result of invocations of IWorkspace.build or IProject.build where the build kind is CLEAN_BUILD.

This default implementation does nothing. Subclasses may override.

Specified by:: clean in class org.eclipse.core.internal.events.InternalBuilder

Parameters:: monitor - a progress monitor, or null if progress reporting and cancellation are not desired
Throws:: CoreException - if this build fails.
Since:: 3.0
See Also:: IWorkspace.build(int, IProgressMonitor), CLEAN_BUILD

forgetLastBuiltState

public final void forgetLastBuiltState()

Requests that this builder forget any state it may be retaining regarding previously built states. Typically this means that the next time the builder runs, it will have to do a full build since it does not have any state upon which to base an incremental build.

Overrides:: forgetLastBuiltState in class org.eclipse.core.internal.events.InternalBuilder

getCommand

public final 
ICommand getCommand()

Returns the build command associated with this builder. The returned command may or may not be in the build specification for the project on which this builder operates.

Any changes made to the returned command will only take effect if the modified command is installed on a project build spec.

Overrides:: getCommand in class org.eclipse.core.internal.events.InternalBuilder

Since:: 3.1
See Also:: IProjectDescription.setBuildSpec(ICommand []), IProject.setDescription(IProjectDescription, int, IProgressMonitor)

getDelta

public final 
IResourceDelta getDelta(
IProject project)

Returns the resource delta recording the changes in the given project since the last time this builder was run. null is returned if no such delta is available. An empty delta is returned if no changes have occurred, or if deltas are not applicable for the current build kind. If null is returned, clients should assume that unspecified changes have occurred and take the appropriate action.

The system reserves the right to trim old state in an effort to conserve space. As such, callers should be prepared to receive null even if they previously requested a delta for a particular project by returning that project from a build call.

A non- null delta will only be supplied for the given project if either the result returned from the previous build included the project or the project is the one associated with this builder.

If the given project was mentioned in the previous build and subsequently deleted, a non- null delta containing the deletion will be returned. If the given project was mentioned in the previous build and was subsequently created, the returned value will be null.

A valid delta will be returned only when this method is called during a build. The delta returned will be valid only for the duration of the enclosing build execution.

Overrides:: getDelta in class org.eclipse.core.internal.events.InternalBuilder

Returns:: the resource delta for the project or null

getProject

public final 
IProject getProject()

Returns the project for which this builder is defined.

Overrides:: getProject in class org.eclipse.core.internal.events.InternalBuilder

Returns:: the project

hasBeenBuilt

public final boolean hasBeenBuilt(
IProject project)

Returns whether the given project has already been built during this build iteration.

When the entire workspace is being built, the projects are built in linear sequence. This method can be used to determine if another project precedes this builder's project in that build sequence. If only a single project is being built, then there is no build order and this method will always return false.

Overrides:: hasBeenBuilt in class org.eclipse.core.internal.events.InternalBuilder

Parameters:: project - the project to check against in the current build order
Returns:: true if the given project has been built in this iteration, and false otherwise.
Since:: 2.1
See Also:: needRebuild()

isInterrupted

public final boolean isInterrupted()

Returns whether an interrupt request has been made for this build. Background autobuild is interrupted when another thread tries to modify the workspace concurrently with the build thread. When this occurs, the build cycle is flagged as interrupted and the build will be terminated at the earliest opportunity. This method allows long running builders to respond to this interruption in a timely manner. Builders are not required to respond to interruption requests.

Overrides:: isInterrupted in class org.eclipse.core.internal.events.InternalBuilder

Returns:: true if the build cycle has been interrupted, and false otherwise.
Since:: 3.0

needRebuild

public final void needRebuild()

Indicates that this builder made changes that affect a project that precedes this project in the currently executing build order, and thus a rebuild will be necessary.

This is an advanced feature that builders should use with caution. This can cause workspace builds to iterate until no more builders require rebuilds.

Overrides:: needRebuild in class org.eclipse.core.internal.events.InternalBuilder

Since:: 2.1
See Also:: hasBeenBuilt(IProject)

setInitializationData

public void setInitializationData(
IConfigurationElement config,
                                  
String propertyName,
                                  
Object data)
                           throws 
CoreException

Sets initialization data for this builder.

This method is part of the IExecutableExtension interface.

Subclasses are free to extend this method to pick up initialization parameters from the plug-in plug-in manifest (plugin.xml) file, but should be sure to invoke this method on their superclass.

For example, the following method looks for a boolean-valued parameter named "trace":

 public void setInitializationData(IConfigurationElement cfig, String propertyName, Object data) throws CoreException {
        super.setInitializationData(cfig, propertyName, data);
        if (data instanceof Hashtable) {
                Hashtable args = (Hashtable) data;
                String traceValue = (String) args.get("trace");
                TRACING = (traceValue != null && traceValue.equals("true"));
        }
 }

Specified by:: setInitializationData in interface IExecutableExtension

Parameters:: config - the configuration element used to trigger this execution. It can be queried by the executable extension for specific configuration properties; propertyName - the name of an attribute of the configuration element used on the createExecutableExtension(String) call. This argument can be used in the cases where a single configuration element is used to define multiple executable extensions.; data - adapter data in the form of a String, a Hashtable, or null.
Throws:: CoreException - if fails.
See Also:: IConfigurationElement.createExecutableExtension(String)

startupOnInitialize

protected void startupOnInitialize()

Informs this builder that it is being started by the build management infrastructure. By the time this method is run, the builder's project is available and setInitializationData has been called. The default implementation should be called by all overriding methods.

Specified by:: startupOnInitialize in class org.eclipse.core.internal.events.InternalBuilder

See Also:: setInitializationData(IConfigurationElement, String, Object)

getRule

public 
ISchedulingRule getRule()

Returns the scheduling rule that is required for building the project for which this builder is defined. The default is the workspace root rule.

Returns:: scheduling rule
Since:: 3.5