SizeSelector (Apache Ant API)

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


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.BaseExtendSelector

                          |

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

All Implemented Interfaces:
ExtendFileSelector, FileSelector, Parameterizable

public class SizeSelector
extends BaseExtendSelector

Selector that filters files based on their size.

Since:
1.5
Author:
Bruce Atherton

Nested Class Summary
static class SizeSelector.ByteUnits
          Enumerated attribute with the values for units.
static class SizeSelector.SizeComparisons
          Enumerated attribute with the values for size comparison.
 
Field Summary
static java.lang.String SIZE_KEY
           
static java.lang.String UNITS_KEY
           
static java.lang.String WHEN_KEY
           
 
Fields inherited from class org.apache.tools.ant.types.selectors.BaseExtendSelector
parameters
 
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
SizeSelector()
           
 
Method Summary
 boolean isSelected(java.io.File basedir, java.lang.String filename, java.io.File file)
          The heart of the matter.
 void setParameters(Parameter[] parameters)
          When using this as a custom selector, this method will be called.
 void setUnits(SizeSelector.ByteUnits units)
          Sets the units to use for the comparison.
 void setValue(long size)
          A size selector needs to know what size to base its selecting on.
 void setWhen(SizeSelector.SizeComparisons cmp)
          This specifies when the file should be selected, whether it be when the file matches a particular size, when it is smaller, or whether it is larger.
 java.lang.String toString()
           
 void verifySettings()
          Checks to make sure all settings are kosher.
 
Methods inherited from class org.apache.tools.ant.types.selectors.BaseExtendSelector
getParameters
 
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
 

Field Detail

SIZE_KEY


public static final java.lang.String SIZE_KEY
See Also:
Constant Field Values

UNITS_KEY


public static final java.lang.String UNITS_KEY
See Also:
Constant Field Values

WHEN_KEY


public static final java.lang.String WHEN_KEY
See Also:
Constant Field Values
Constructor Detail

SizeSelector


public SizeSelector()
Method Detail

toString


public java.lang.String toString()
Overrides:
toString in class java.lang.Object

setValue


public void setValue(long size)
A size selector needs to know what size to base its selecting on. This will be further modified by the multiplier to get an actual size limit.

Parameters:
size - the size to select against expressed in units

setUnits


public void setUnits(SizeSelector.ByteUnits units)
Sets the units to use for the comparison. This is a little complicated because common usage has created standards that play havoc with capitalization rules. Thus, some people will use "K" for indicating 1000's, when the SI standard calls for "k". Others have tried to introduce "K" as a multiple of 1024, but that falls down when you reach "M", since "m" is already defined as 0.001.

To get around this complexity, a number of standards bodies have proposed the 2^10 standard, and at least one has adopted it. But we are still left with a populace that isn't clear on how capitalization should work.

We therefore ignore capitalization as much as possible. Completely mixed case is not possible, but all upper and lower forms are accepted for all long and short forms. Since we have no need to work with the 0.001 case, this practice works here.

This function translates all the long and short forms that a unit prefix can occur in and translates them into a single multiplier.

Parameters:
units - The units to compare the size to, using an EnumeratedAttribute

setWhen


public void setWhen(SizeSelector.SizeComparisons cmp)
This specifies when the file should be selected, whether it be when the file matches a particular size, when it is smaller, or whether it is larger.

Parameters:
cmp - The comparison to perform, an EnumeratedAttribute

setParameters


public void setParameters(Parameter[] parameters)
When using this as a custom selector, this method will be called. It translates each parameter into the appropriate setXXX() call.

Specified by:
setParameters in interface Parameterizable
Overrides:
setParameters in class BaseExtendSelector
Parameters:
parameters - the complete set of parameters for this selector

verifySettings


public void verifySettings()

Checks to make sure all settings are kosher. In this case, it means that the size attribute has been set (to a positive value), that the multiplier has a valid setting, and that the size limit is valid. Since the latter is a calculated value, this can only fail due to a programming error.

If a problem is detected, the setError() method is called.

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 BaseExtendSelector
Parameters:
basedir - A java.io.File object for the base directory
filename - The name of the file to check
file - A File object for this filename
Returns:
whether the file should be selected or not


Copyright 2000-2002 Apache Software Foundation. All Rights Reserved.