public java.lang.String getFilter() {
      java.lang.Object ref = filter_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        filter_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Required. The filter string specifies the jobs to be enumerated.

Supported operator: =, AND

The fields eligible for filtering are:

* `companyName`
* `requisitionId`
* `status` Available values: OPEN, EXPIRED, ALL. Defaults to
OPEN if no value is specified.

At least one of `companyName` and `requisitionId` must present or an
INVALID_ARGUMENT error is thrown.

Sample Query:

* companyName = "projects/foo/tenants/bar/companies/baz"
* companyName = "projects/foo/tenants/bar/companies/baz" AND
requisitionId = "req-1"
* companyName = "projects/foo/tenants/bar/companies/baz" AND
status = "EXPIRED"
* requisitionId = "req-1"
* requisitionId = "req-1" AND status = "EXPIRED"
</pre>

<code>string filter = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return The filter.
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/ListJobsRequest.java