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## org.apache.tools.ant.types.selectors.modifiedselector
Interface Algorithm

All Known Implementing Classes:
  DigestAlgorithm, HashvalueAlgorithm

public interface Algorithm

The Algorithm defines how a value for a file is computed. It must be sure that multiple calls for the same file results in the same value. The implementing class should implement a useful toString() method.

Since:
  Ant 1.6
Version:
  2003-09-13

Method Summary
`java.lang.String` | `getValue(java.io.File file)` Get the value for a file.
`boolean` | `isValid()` Checks its prerequisites.

Method Detail

### isValid

    public boolean isValid()

  Checks its prerequisites.

  Returns:
    true if all is ok, otherwise false.

### getValue

    public java.lang.String getValue(java.io.File file)

  Get the value for a file.

  Parameters:
    `file` - File object for which the value should be evaluated.
  Returns:
    The value for that file

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