Package org.apache.tools.ant.types.selectors

## Class BaseSelector

- java.lang.Object
- - org.apache.tools.ant.ProjectComponent
  - - org.apache.tools.ant.types.DataType
    - - org.apache.tools.ant.types.selectors.BaseSelector

All Implemented Interfaces:
  `java.lang.Cloneable`, `ResourceSelector`, `FileSelector`

Direct Known Subclasses:
  `BaseExtendSelector`, `BaseSelectorContainer`, `ExtendSelector`, `MappingSelector`, `PresentSelector`, `ScriptSelector`

    public abstract class BaseSelector
    extends DataType
    implements FileSelector

A convenience base class that you can subclass Selectors from. It provides some helpful common behaviour. Note that there is no need for Selectors to inherit from this class, it is only necessary that they implement FileSelector.

Since:
  1.5

### Field Summary

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

`checked, ref`

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

`description, location, project`

### Constructor Summary

Constructors
`BaseSelector()`

### Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
`java.lang.String` `getError()` Returns any error messages that have been set.
`abstract boolean` `isSelected​(java.io.File basedir, java.lang.String filename, java.io.File file)` Method that each selector will implement to create their selection behaviour.
`void` `setError​(java.lang.String msg)` Allows all selectors to indicate a setup error.
`void` `setError​(java.lang.String msg, java.lang.Throwable cause)` Allows all selectors to indicate a setup error.
`void` `validate()` Subclasses can use this to throw the requisite exception in isSelected() in the case of an error condition.
`void` `verifySettings()` Subclasses can override this method to provide checking of their state.

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

`checkAttributesAllowed, checkChildrenAllowed, circularReference, clone, dieOnCircularReference, dieOnCircularReference, dieOnCircularReference, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getDataTypeName, getRefid, invokeCircularReferenceCheck, isChecked, isReference, noChildrenAllowed, pushAndInvokeCircularReferenceCheck, setChecked, setRefid, tooManyAttributes, toString`

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

`getDescription, getLocation, getProject, log, log, setDescription, setLocation, setProject`

### Methods inherited from class java.lang.Object

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

### Methods inherited from interface org.apache.tools.ant.types.selectors.FileSelector

`isSelected`

### Constructor Detail

#### BaseSelector

    public BaseSelector()

### Method Detail

#### setError

    public void setError​(java.lang.String msg)

Allows all selectors to indicate a setup error. Note that only the first error message is recorded.

Parameters:
  `msg` - The error message any BuildException should throw.

#### setError

    public void setError​(java.lang.String msg,
                         java.lang.Throwable cause)

Allows all selectors to indicate a setup error. Note that only the first error message is recorded.

Parameters:
  `msg` - The error message any BuildException should throw.
  `cause` - Throwable

#### getError

    public java.lang.String getError()

Returns any error messages that have been set.

Returns:
  the error condition

#### verifySettings

    public void verifySettings()

Subclasses can override this method to provide checking of their state. So long as they call validate() from isSelected(), this will be called automatically (unless they override validate()).

Implementations should check for incorrect settings and call setError() as necessary.

#### validate

    public void validate()

Subclasses can use this to throw the requisite exception in isSelected() in the case of an error condition.

#### isSelected

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

Method that each selector will implement to create their selection behaviour. If there is a problem with the setup of a selector, it can throw a BuildException to indicate the problem.

Specified by:
  `isSelected` in interface `FileSelector`
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