Google

Uptodate

Description

Sets a property if a target file or set of target files is more up-to-date than a source file or set of source files. A single source file is specified using the srcfile attribute. A set of source files is specified using the nested <srcfiles> elements. These are FileSets, whereas multiple target files are specified using a nested <mapper> element.

By default, the value of the property is set to true if the timestamp of the target file(s) is more recent than the timestamp of the corresponding source file(s). You can set the value to something other than the default by specifying the value attribute.

If a <srcfiles> element is used, without also specifying a <mapper> element, the default behavior is to use a merge mapper, with the to attribute set to the value of the targetfile attribute.

Normally, this task is used to set properties that are useful to avoid target execution depending on the relative age of the specified files.

Parameters

Attribute Description Required
property The name of the property to set. Yes
value The value to set the property to. No; defaults to true.
srcfile The file to check against the target file(s). Yes, unless a nested <srcfiles> element is present.
targetfile The file for which we want to determine the status. Yes, unless a nested <mapper> element is present.

Parameters specified as nested elements

srcfiles

The nested <srcfiles> element allows you to specify a set of files to check against the target file(s).

Note: You can specify either the srcfile attribute or nested <srcfiles> elements, but not both.

mapper

The nested <mapper> element allows you to specify a set of target files to check for being up-to-date with respect to a set of source files.

Examples

</uptodate>

This can be written as:

</uptodate> as well. <target> tag's unless attribute to conditionally run that target. For example, running the following target:



  ...

</target>

will first run the chkXmlBuild target, which contains the <uptodate> task that determines whether the unless attribute is then checked for being set/not set. If it did get set (ie., the jar file is up-to-date),

The following example shows a single source file being checked against a single target file:

  <uptodate property="isUpToDate"

            srcfile="/usr/local/bin/testit"

            targetfile="${build}/.flagfile"/>

sets the property isUpToDate to true if /usr/local/bin/testit is newer than ${build}/.flagfile.


Copyright © 2000-2002 Apache Software Foundation. All rights Reserved.