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## org.apache.tools.ant.taskdefs.optional
Class PropertyFile

    java.lang.Object
      org.apache.tools.ant.ProjectComponent
          org.apache.tools.ant.Task
              org.apache.tools.ant.taskdefs.optional.PropertyFile

All Implemented Interfaces:
  java.lang.Cloneable

    public class PropertyFile

extends Task

Modifies settings in a property file.

The following is an example of its usage:

        <target name="setState">
          <property
            name="header"
            value="##Generated file - do not modify!"/>
          <propertyfile file="apropfile.properties" comment="${header}">
            <entry key="product.version.major" type="int"  value="5"/>
            <entry key="product.version.minor" type="int"  value="0"/>
            <entry key="product.build.major"   type="int"  value="0" />
            <entry key="product.build.minor"   type="int"  operation="+" />
            <entry key="product.build.date"    type="date" value="now" />
            <entry key="intSet" type="int" operation="=" value="681"/>
            <entry key="intDec" type="int" operation="-"/>
            <entry key="StringEquals" type="string" value="testValue"/>
         </propertyfile>
       </target>

The <propertyfile> task must have:

- file

Other parameters are:

- comment
- key
- operation
- type
- value (the final four being eliminated shortly)

The <entry> task must have:

- key

Other parameters are:

- operation
- type
- value
- default
- unit

If type is unspecified, it defaults to string. Parameter values:

- operation:

- "=" (set -- default)
- "-" (dec)
- "+" (inc)

- type:

- "int"
- "date"
- "string"

- value:

- holds the default value, if the property was not found in property file
- "now" In case of type "date", the value "now" will be replaced by the current date/time and used even if a valid date was found in the property file.

String property types can only use the "=" operation. Int property types can only use the "=", "-" or "+" operations.

The message property is used for the property file header, with "\\" being a newline delimiter character.

Nested Class Summary
`static class` | `PropertyFile.Entry` Instance of this class represents nested elements of a task propertyfile.
`static class` | `PropertyFile.Unit` Borrowed from Tstamp

Field Summary

Fields inherited from class org.apache.tools.ant.Task
`target, taskName, taskType, wrapper`

Fields inherited from class org.apache.tools.ant.ProjectComponent
`description, location, project`

Constructor Summary
`PropertyFile()`

Method Summary
`PropertyFile.Entry` | `createEntry()` The entry nested element.
`void` | `execute()` Execute the task.
`void` | `setComment(java.lang.String hdr)` optional header comment for the file
`void` | `setFile(java.io.File file)` Location of the property file to be edited; required.
`void` | `setJDKProperties(boolean val)` optional flag to use original Java properties (as opposed to layout preserving properties)

Methods inherited from class org.apache.tools.ant.Task
`bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType`

Methods inherited from class org.apache.tools.ant.ProjectComponent
`clone, getDescription, getLocation, getProject, setDescription, setLocation, setProject`

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### PropertyFile

    public PropertyFile()

Method Detail

### execute

    public void execute()
                 throws BuildException

  Execute the task.

  Overrides:
    `execute` in class `Task`
  Throws:
    `BuildException` - on error.

### createEntry

    public PropertyFile.Entry createEntry()

  The entry nested element.

  Returns:
    an entry nested element to be configured.

### setFile

    public void setFile(java.io.File file)

  Location of the property file to be edited; required.

  Parameters:
    `file` - the property file.

### setComment

    public void setComment(java.lang.String hdr)

  optional header comment for the file

  Parameters:
    `hdr` - the string to use for the comment.

### setJDKProperties

    public void setJDKProperties(boolean val)

  optional flag to use original Java properties (as opposed to layout preserving properties)

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