CODEWITHSUNDEEP
arraysloopsforeachantant-contrib
useranon
useranon

Reputation: 29514

Iterate through array of hashes in ANT script

I am working on some automation using Jenkins, where I have the schema and DB details stored like

[schema1:db1, schema2:db2] stored in a ANT property ${schemaValue}

<propertycopy name="schemaValue" from="${SchemaVariable}"/>

Now I am trying to loop through this array of hashes to execute the connection, I have tried with 

        <for param="theparam" list="${schemaValue}">
            <sequential>
                <echo message="param: @{theparam}"/>
            </sequential>
        </for>

But this considers ${schemaValue} as String and not an array,

Help on this.

EDIT

As suggested by @AR.3, I have tried with 

<propertyregex override="yes" property="paramValue" input="@{theparam}" regexp=".+:([^\]]+)]?" replace="\1"/>
<echo message="paramValue: ${paramValue}"/>
<propertyregex override="yes" property="paramKey" input="@{theparam}" regexp="[?([^\[]+):]" replace="\1"/>
<echo message="paramKey: ${paramKey}"/>

${paramValue} gives me db1 and db2 correctly

${paramKey} throws me error

Upvotes: 2

Views: 937

Answers (1)

M A
M A

Reputation: 72854

There is no concept of an array in Ant in the strict sense that exists in standard programming languages. The for loop will simply iterate over elements of a string delimited by a delimiter (the default delimiter is ,). In your case, it also looks more like a map or a list of key-value pairs.

If the expected behavior is to print the values in the map (db1 and db2), an additional step involving a regular expression replacement can be used:

<for param="theparam" list="${schemaValue}">
    <sequential>
        <propertyregex override="yes"
              property="paramValue"  input="@{theparam}"
              regexp=".+:([^\]]+)]?" replace="\1"/>
        <echo message="param: ${paramValue}"/>
    </sequential>
</for>

So originally, the echoed values contained in theparam will be [schema1:db1 and schema2:db2]. The pattern .+:([^\]]+)]? will match against such values, by matching against:

  1. one or more characters,
  2. followed by a :,
  3. followed by non-] characters,
  4. followed by zero or one ].

The propertyregex will put the value of the first group, i.e. the one matched by ([^\]]+) in a property paramValue. This will be in fact the value after the colon.

Running it should print:

[echo] param: db1
[echo] param: db2

EDIT:

To get the key instead, you can use the following regex:

<propertyregex override="yes" property="paramKey"
               input="@{theparam}" regexp="\[?([^\[]+):[^\]]+]?" replace="\1"/>

Upvotes: 2

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