Conditions

Conditions are nested elements of the <condition> and <waitfor> tasks. There are core conditions and custom conditions. Custom conditions are described in Custom Conditions. Core Conditions are described below.

Core Conditions

These are the nested elements that can be used as conditions in the <condition> and <waitfor> tasks.

not

The <not> element expects exactly one other condition to be nested into this element, negating the result of the condition. It doesn't have any attributes and accepts all nested elements of the condition task as nested elements as well.

and

The <and> element doesn't have any attributes and accepts an arbitrary number of conditions as nested elements - all nested elements of the condition task are supported. This condition is true if all of its contained conditions are, conditions will be evaluated in the order they have been specified in the build file.

The <and> condition has the same shortcut semantics as the Java && operator, as soon as one of the nested conditions is false, no other condition will be evaluated.

or

The <or> element doesn't have any attributes and accepts an arbitrary number of conditions as nested elements - all nested elements of the condition task are supported. This condition is true if at least one of its contained conditions is, conditions will be evaluated in the order they have been specified in the build file.

The <or> condition has the same shortcut semantics as the Java || operator, as soon as one of the nested conditions is true, no other condition will be evaluated.

available

This condition is identical to the Available task, all attributes and nested elements of that task are supported, the property and value attributes are redundant and will be ignored.

uptodate

This condition is identical to the Uptodate task, all attributes and nested elements of that task are supported, the property and value attributes are redundant and will be ignored.

os

Test whether the current operating system is of a given type. Each defined attribute is tested and the result is true only if all the tests succeed.

Attribute Description Required
family The name of the operating system family to expect. No
name The name of the operating system to expect. No
arch The architecture of the operating system to expect. No
version The version of the operating system to expect. No

Supported values for the family attribute are:

equals

Tests whether the two given Strings are identical

Attribute Description Required
arg1 First string to test. Yes
arg2 Second string to test. Yes
casesensitive Perform a case sensitive comparision. Default is true. No
trim Trim whitespace from arguments before comparing them. Default is false. No

isset

Test whether a given property has been set in this project.

Attribute Description Required
property The name of the property to test. Yes

checksum

This condition is identical to the Checksum task, all attributes and nested elements of that task are supported, the property and overwrite attributes are redundant and will be ignored.

http

The http condition checks for a valid response from a web server of the specified url. By default, HTTP responses errors of 400 or greater are viewed as invalid.

Attribute Description Required
url The full URL of the page to request. The web server must return a status code below the value of errorsBeginAt Yes.
errorsBeginAt The lowest HTTP response code that signals an error; by default '400'; server errors, not-authorized, not-found and the like are detected No

socket

The socket condition checks for the existence of a TCP/IP listener at the specified host and port.

Attribute Description Required
server The DNS name or IP address of the server. Yes.
port The port number to connect to. Yes.

filesmatch

Test two files for matching. Nonexistence of either file results in "false". This test does a byte for byte comparision, so test time scales with byte size. NB: if the files are different sizes , one of them is missing or the filenames match the answer is so obvious the detailed test is omitted.

Attribute Description Required
file1 First file to test Yes.
file2 Second file to test Yes.

contains

Tests whether a string contains another one.

Attribute Description Required
string The string to search in. Yes
substring The string to search for. Yes
casesensitive Perform a case sensitive comparision. Default is true. No

istrue

Tests whether a string equals any of the ant definitions of true, that is "true","yes", or "on"

Attribute Description Required
value value to test Yes
    <istrue value="${someproperty}"/>
    <istrue value="false"/>

isfalse

Tests whether a string is not true, the negation of <istrue>

Attribute Description Required
value value to test Yes
    <isfalse value="${someproperty}"/>
    <isfalse value="false"/>

isreference

Test whether a given reference has been defined in this project and - optionally - is of an expected type.

This condition has been added in Apache Ant 1.6.

Attribute Description Required
refid The id of the reference to test. Yes
type Name of the data type or task this reference is expected to be. No

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