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Scripting: Add Field Methods

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Added infrastructure to allow basic member methods in the expressions
language to be called.  The methods must have a signature with no arguments.  Also
added the following member methods for date fields (and it should be easy to add more)
* getYear
* getMonth
* getDayOfMonth
* getHourOfDay
* getMinutes
* getSeconds

Allow fields to be accessed without using the member variable [value].
(Note that both ways can be used to access fields for back-compat.)

closes #10890
This commit is contained in:
Jack Conradson 2015-04-28 17:43:02 -07:00
parent d2b12e4fc2
commit aa968f6b65
6 changed files with 268 additions and 16 deletions
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14
docs/reference/modules/scripting.asciidoc
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@ -389,9 +389,23 @@ for details on what operators and functions are available.
Variables in `expression` scripts are available to access:
* Single valued document fields, e.g. `doc['myfield'].value`
* Single valued document fields can also be accessed without `.value` e.g. `doc['myfield']`
* Parameters passed into the script, e.g. `mymodifier`
* The current document's score, `_score` (only available when used in a `script_score`)
Variables in `expression` scripts that are of type `date` may use the following member methods:
* getYear()
* getMonth()
* getDayOfMonth()
* getHourOfDay()
* getMinutes()
* getSeconds()
The following example shows the difference in years between the `date` fields date0 and date1:
`doc['date1'].getYear() - doc['date0'].getYear()`
There are a few limitations relative to other script languages:
* Only numeric fields may be accessed