PresentSelector (Apache Ant API)

org.apache.tools.ant.types.selectors
Class PresentSelector

java.lang.Object

  |

  +--org.apache.tools.ant.ProjectComponent

        |

        +--org.apache.tools.ant.types.DataType

              |

              +--org.apache.tools.ant.types.selectors.BaseSelector

                    |

                    +--org.apache.tools.ant.types.selectors.PresentSelector

All Implemented Interfaces:

FileSelector

public class PresentSelector

extends BaseSelector

Selector that filters files based on whether they appear in another directory tree. It can contain a mapper element, so isn't available as an ExtendSelector (since those parameters can't hold other elements).

Since:

1.5

Author:

Bruce Atherton

Nested Class Summary

static class

PresentSelector.FilePresence Enumerated attribute with the values for indicating where a file's presence is allowed and required.

Field Summary

Fields inherited from class org.apache.tools.ant.types.DataType

checked, description, ref

Fields inherited from class org.apache.tools.ant.ProjectComponent

project

Constructor Summary

PresentSelector()

Method Summary

Mapper	createMapper() Defines the FileNameMapper to use (nested mapper element).
boolean	isSelected(java.io.File basedir, java.lang.String filename, java.io.File file) The heart of the matter.
void	setPresent(PresentSelector.FilePresence fp) This sets whether to select a file if its dest file is present.
void	setTargetdir(java.io.File targetdir) The name of the file or directory which is checked for matching files.
java.lang.String	toString()
void	verifySettings() Checks to make sure all settings are kosher.

Methods inherited from class org.apache.tools.ant.types.selectors.BaseSelector

getError, setError, validate

Methods inherited from class org.apache.tools.ant.types.DataType

circularReference, dieOnCircularReference, getCheckedRef, getDescription, isReference, noChildrenAllowed, setDescription, setRefid, tooManyAttributes

Methods inherited from class org.apache.tools.ant.ProjectComponent

getProject, log, log, setProject

Methods inherited from class java.lang.Object

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

Constructor Detail

PresentSelector

public PresentSelector()

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

setTargetdir

public void setTargetdir(java.io.File targetdir)

The name of the file or directory which is checked for matching files.

Parameters:

targetdir - the directory to scan looking for matching files.

createMapper

public Mapper createMapper()
                    throws BuildException

Defines the FileNameMapper to use (nested mapper element).

BuildException

setPresent

public void setPresent(PresentSelector.FilePresence fp)

This sets whether to select a file if its dest file is present. It could be a negate boolean, but by doing things this way, we get some documentation on how the system works. A user looking at the documentation should clearly understand that the ONLY files whose presence is being tested are those that already exist in the source directory, hence the lack of a destonly option.

Parameters:

fp - An attribute set to either srconlyboth.

verifySettings

public void verifySettings()

Checks to make sure all settings are kosher. In this case, it means that the targetdir attribute has been set and we have a mapper.

Overrides:

verifySettings in class BaseSelector

isSelected

public boolean isSelected(java.io.File basedir,
                          java.lang.String filename,
                          java.io.File file)

The heart of the matter. This is where the selector gets to decide on the inclusion of a file in a particular fileset.

Specified by:

isSelected in interface FileSelector

Specified by:

isSelected in class BaseSelector

Parameters:

basedir - the base directory the scan is being done from

filename - is the name of the file to check

file - is a java.io.File object the selector can use

Returns:

whether the file should be selected or not