Package org.codehaus.plexus.build

Class DefaultBuildContext

java.lang.Object

org.codehaus.plexus.build.DefaultBuildContext

All Implemented Interfaces:

BuildContext

@Named("default")
@Singleton
public class DefaultBuildContext
extends Object
implements BuildContext

Filesystem based non-incremental build context implementation which behaves as if all files were just created. More specifically, hasDelta returns true for all paths newScanner returns Scanner that scans all files under provided basedir newDeletedScanner always returns empty scanner. isIncremental returns false getValue always returns null

Field Summary

Fields inherited from interface org.codehaus.plexus.build.BuildContext

SEVERITY_ERROR, SEVERITY_WARNING

Constructor Summary

Constructors

Constructor	Description
DefaultBuildContext()

Method Summary

Modifier and Type	Method	Description
void	addError(File file, int line, int column, String message, Throwable cause)	addError.
void	addMessage(File file, int line, int column, String message, int severity, Throwable cause)	Adds a message to the build context.
void	addWarning(File file, int line, int column, String message, Throwable cause)	addWarning.
Object	getValue(String key)	Returns value associated with key during previous mojo execution.
boolean	hasDelta(File file)	hasDelta.
boolean	hasDelta(String relpath)	Returns true if file or folder identified by relpath has changed since last build.
boolean	hasDelta(List<String> relpaths)	hasDelta.
boolean	isIncremental()	isIncremental.
boolean	isUptodate(File target, File source)	Returns true, if the target file exists and is uptodate compared to the source file.
org.codehaus.plexus.util.Scanner	newDeleteScanner(File basedir)	Returned Scanner scans basedir for files and directories deleted since last build.
OutputStream	newFileOutputStream(File file)	Returns new OutputStream that writes to the file.
org.codehaus.plexus.util.Scanner	newScanner(File basedir)	Convenience method, fully equal to newScanner(basedir, false)
org.codehaus.plexus.util.Scanner	newScanner(File basedir, boolean ignoreDelta)	Returned Scanner scans files and folders under basedir.
void	refresh(File file)	Indicates that the file or folder content has been modified during the build.
void	removeMessages(File file)	Removes all messages associated with a file or folder during a previous build.
void	setValue(String key, Object value)	Associate specified key with specified value in the build context.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultBuildContext

public DefaultBuildContext()

Method Detail

hasDelta

public boolean hasDelta(String relpath)

Returns true if file or folder identified by relpath has changed since last build.

Specified by:

hasDelta in interface BuildContext

Parameters:

relpath - is path relative to build context basedir

Returns:

a boolean.

hasDelta

public boolean hasDelta(File file)

hasDelta.

Specified by:

hasDelta in interface BuildContext

Parameters:

file - a File object.

Returns:

a boolean.

hasDelta

public boolean hasDelta(List<String> relpaths)

hasDelta.

Specified by:

hasDelta in interface BuildContext

Parameters:

relpaths - a List object.

Returns:

a boolean.

newFileOutputStream

public OutputStream newFileOutputStream(File file)
                                 throws IOException

Returns new OutputStream that writes to the file. Files changed using OutputStream returned by this method do not need to be explicitly refreshed using BuildContext.refresh(File). As an optional optimisation, OutputStreams created by incremental build context will attempt to avoid writing to the file if file content has not changed.

Specified by:

newFileOutputStream in interface BuildContext

Parameters:

file - a File object.

Returns:

a OutputStream object.

Throws:

IOException - if any.

newScanner

public org.codehaus.plexus.util.Scanner newScanner(File basedir)

Convenience method, fully equal to newScanner(basedir, false)

Specified by:

newScanner in interface BuildContext

Parameters:

basedir - a File object.

Returns:

a Scanner object.

refresh

public void refresh(File file)

Indicates that the file or folder content has been modified during the build.

Specified by:

refresh in interface BuildContext

Parameters:

file - a File object.

See Also:

BuildContext.newFileOutputStream(File)

newDeleteScanner

public org.codehaus.plexus.util.Scanner newDeleteScanner(File basedir)

Returned Scanner scans basedir for files and directories deleted since last build. Returns empty Scanner if basedir is not under this build context basedir.

Specified by:

newDeleteScanner in interface BuildContext

Parameters:

basedir - a File object.

Returns:

a Scanner object.

newScanner

public org.codehaus.plexus.util.Scanner newScanner(File basedir,
                                                   boolean ignoreDelta)

Returned Scanner scans files and folders under basedir. If this is an incremental build context and ignoreDelta is false, the scanner will only "see" files and folders with content changes since last build. If ignoreDelta is true, the scanner will "see" all files and folders. Please beware that ignoreDelta=false does NOT work reliably for operations that copy resources from source to target locations. Returned Scanner only scans changed source resources and it does not consider changed or deleted target resources. This results in missing or stale target resources. Starting with 0.5.0, recommended way to process resources is to use #newScanner(basedir,true) to locate all source resources and BuildContext.isUptodate(File, File) to optimized processing of uptodate target resources. Returns empty Scanner if basedir is not under this build context basedir. https://issues.apache.org/jira/browse/MSHARED-125

Specified by:

newScanner in interface BuildContext

Parameters:

basedir - a File object.

ignoreDelta - a boolean.

Returns:

a Scanner object.

isIncremental

public boolean isIncremental()

isIncremental.

Specified by:

isIncremental in interface BuildContext

Returns:

a boolean.

getValue

public Object getValue(String key)

Returns value associated with key during previous mojo execution. This method always returns null for non-incremental builds (i.e., BuildContext.isIncremental() returns false) and mojos are expected to fall back to full, non-incremental behaviour.

Specified by:

getValue in interface BuildContext

Parameters:

key - a String object.

Returns:

a Object object.

See Also:

BuildContext.setValue(String, Object), BuildContext.isIncremental()

setValue

public void setValue(String key,
                     Object value)

Associate specified key with specified value in the build context. Primary (and the only) purpose of this method is to allow preservation of state needed for proper incremental behaviour between consecutive executions of the same mojo needed to. For example, maven-plugin-plugin:descriptor mojo can store collection of extracted MojoDescritpor during first invocation. Then on each consecutive execution maven-plugin-plugin:descriptor will only need to extract MojoDescriptors for changed files.

Specified by:

setValue in interface BuildContext

Parameters:

key - a String object.

value - a Object object.

See Also:

BuildContext.getValue(String)

addError

public void addError(File file,
                     int line,
                     int column,
                     String message,
                     Throwable cause)

addError.

Specified by:

addError in interface BuildContext

Parameters:

file - a File object.

line - a int.

column - a int.

message - a String object.

cause - a Throwable object.

addWarning

public void addWarning(File file,
                       int line,
                       int column,
                       String message,
                       Throwable cause)

addWarning.

Specified by:

addWarning in interface BuildContext

Parameters:

file - a File object.

line - a int.

column - a int.

message - a String object.

cause - a Throwable object.

addMessage

public void addMessage(File file,
                       int line,
                       int column,
                       String message,
                       int severity,
                       Throwable cause)

Adds a message to the build context. The message is associated with a file and a location inside that file.

Specified by:

addMessage in interface BuildContext

Parameters:

file - The file or folder with which the message is associated. Should not be null and it is recommended to be an absolute path.

line - The line number inside the file. Use 1 (not 0) for the first line. Use 0 for unknown/unspecified.

column - The column number inside the file. Use 1 (not 0) for the first column. Use 0 for unknown/unspecified.

message - a String object.

severity - The severity of the message: SEVERITY_WARNING or SEVERITY_ERROR.

cause - A Throwable object associated with the message. Can be null.

removeMessages

public void removeMessages(File file)

Removes all messages associated with a file or folder during a previous build. It does not affect the messages added during the current build.

Specified by:

removeMessages in interface BuildContext

Parameters:

file - a File object.

isUptodate

public boolean isUptodate(File target,
                          File source)

Returns true, if the target file exists and is uptodate compared to the source file. More specifically, this method returns true when both target and source files exist, do not have changes since last incremental build and the target file was last modified later than the source file. Returns false in all other cases.

Specified by:

isUptodate in interface BuildContext

Parameters:

target - a File object.

source - a File object.

Returns:

a boolean.