Github user mattyb149 commented on a diff in the pull request: https://github.com/apache/nifi/pull/2920#discussion_r205851625 --- Diff: nifi-commons/nifi-record-path/src/main/java/org/apache/nifi/record/path/functions/Base64Decode.java --- @@ -0,0 +1,50 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.nifi.record.path.functions; + +import org.apache.nifi.record.path.FieldValue; +import org.apache.nifi.record.path.RecordPathEvaluationContext; +import org.apache.nifi.record.path.StandardFieldValue; +import org.apache.nifi.record.path.paths.RecordPathSegment; + +import java.util.Base64; +import java.util.stream.Stream; + +public class Base64Decode extends RecordPathSegment { + private final RecordPathSegment recordPath; + + public Base64Decode(final RecordPathSegment recordPath, final boolean absolute) { + super("base64Decode", null, absolute); + this.recordPath = recordPath; + } + + @Override + public Stream<FieldValue> evaluate(final RecordPathEvaluationContext context) { + final Stream<FieldValue> fieldValues = recordPath.evaluate(context); + return fieldValues.filter(fv -> fv.getValue() != null) + .map(fv -> { + + if (!(fv.getValue() instanceof String)) { + throw new IllegalArgumentException("Argument supplied to base64Encode must be a String"); --- End diff -- Both good points, I've made the changes and will push an update shortly, thanks!
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