Adds tool function to compare value for minimum/maximum

lib/core/tools/Get-IcingaValue.psm1

@@ -0,0 +1,66 @@
+<#
+.SYNOPSIS
+   Compares two numeric input values and returns the lower or higher value
+.DESCRIPTION
+   Compares two numeric numbers and returns either the higher or lower value
+   depending on the configuration of the argument
+
+   More Information on https://github.com/Icinga/icinga-powershell-framework
+.FUNCTIONALITY
+   Compares two numeric input values and returns the lower or higher value
+.PARAMETER Value
+   The input value to check for
+.PARAMETER Compare
+   The value to compare against
+.PARAMETER Minimum
+   Configures the command to return the lower number of both inputs
+.PARAMETER Maximum
+   Configures the command to return the higher number of both inputs
+.INPUTS
+   System.Integer
+.OUTPUTS
+   System.Integer
+.LINK
+   https://github.com/Icinga/icinga-powershell-framework
+.NOTES
+#>
+
+function Get-IcingaValue()
+{
+    param(
+        $Value,
+        $Compare,
+        [switch]$Minimum = $FALSE,
+        [switch]$Maximum = $FALSE
+    );
+
+    # If none of both is set, return the current value
+    if (-Not $Minimum -And -Not $Maximum) {
+        return $Value;
+    }
+
+    # Return the lower value
+    if ($Minimum) {
+        # If the value is greater or equal the compared value, return the compared one
+        if ($Value -ge $Compare) {
+            return $Compare;
+        }
+
+        # Otherwise return the value itself
+        return $Value;
+    }
+
+    # Return the higher value
+    if ($Maximum) {
+        # If the value is greater or equal the compared one, return the value
+        if ($Value -ge $Compare) {
+            return $Value;
+        }
+
+        # Otherwise return the compared value
+        return $Compare;
+    }
+
+    # Shouldnt happen anyway
+    return $Value;
+}