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

# Class Compare

java.lang.Object
org.apache.tools.ant.ProjectComponent
org.apache.tools.ant.types.DataType
org.apache.tools.ant.types.resources.selectors.Compare

All Implemented Interfaces:
  `Cloneable`, `ResourceSelector`

public class Compare extends DataType implements ResourceSelector
ResourceSelector that compares against "control" Resource(s) using ResourceComparators.

Since:
  Ant 1.7

## 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
Constructor
Description
`Compare()`

## Method Summary

Modifier and Type
Method
Description
`void`
`add(ResourceComparator c)`
Add a ResourceComparator to this Compare selector.
`ResourceCollection`
`createControl()`
Create the nested control element.
`protected void`
`dieOnCircularReference(Stack<Object> stk, Project p)`
Overrides the version from DataType to recurse on nested ResourceComparators.
`boolean`
`isSelected(Resource r)`
Return true if this Resource is selected.
`void`
`setAgainst(Quantifier against)`
Set the quantifier to be used.
`void`
`setWhen(Comparison when)`
Set the comparison to be used.

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

`checkAttributesAllowed, checkChildrenAllowed, circularReference, clone, 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`

## Constructor Details

### Compare

public Compare()

## Method Details

### add

public void add(ResourceComparator c)
Add a ResourceComparator to this Compare selector. If multiple ResourceComparators are added, they will be processed in LIFO order.

Parameters:
  `c` - the ResourceComparator to add.

### setAgainst

public void setAgainst(Quantifier against)
Set the quantifier to be used. Default "all".

Parameters:
  `against` - the Quantifier EnumeratedAttribute to use.

### setWhen

public void setWhen(Comparison when)
Set the comparison to be used. Default "equal".

Parameters:
  `when` - the Comparison EnumeratedAttribute to use.

### createControl

public ResourceCollection createControl()
Create the nested control element. These are the resources to compare against.

Returns:
  ResourceCollection.

### isSelected

public boolean isSelected(Resource r)
Return true if this Resource is selected.

Specified by:
  `isSelected` in interface `ResourceSelector`
Parameters:
  `r` - the Resource to check.
Returns:
  whether the Resource was selected.

### dieOnCircularReference

protected void dieOnCircularReference(Stack<Object> stk, Project p) throws BuildException
Overrides the version from DataType to recurse on nested ResourceComparators.

Overrides:
  `dieOnCircularReference` in class `DataType`
Parameters:
  `stk` - the stack of data types to use (recursively).
  `p` - the project to use to dereference the references.
Throws:
  `BuildException` - on error.