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EscapeJson function added to expression-language 

Made use of org.apache.commons.lang3.StringEscapeUtils to do that
actual processing

Signed-off-by: Matt Burgess <mattyb149@apache.org>
This commit is contained in:
Devin Fisher 2016-07-03 01:53:16 +02:00 committed by Matt Burgess
parent e5e86cf07c
commit ebd11b1d8f
5 changed files with 75 additions and 13 deletions
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1
nifi-commons/nifi-expression-language/src/main/antlr3/org/apache/nifi/attribute/expression/language/antlr/AttributeExpressionLexer.g
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@ -117,6 +117,7 @@ URL_DECODE : 'urlDecode';
NOT : 'not';
COUNT : 'count';
RANDOM : 'random';
ESCAPE_JSON : 'escapeJson';
// 1 arg functions
SUBSTRING_AFTER : 'substringAfter';

2
nifi-commons/nifi-expression-language/src/main/antlr3/org/apache/nifi/attribute/expression/language/antlr/AttributeExpressionParser.g
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@ -73,7 +73,7 @@ tokens {
}
// functions that return Strings
zeroArgString : (TO_UPPER | TO_LOWER | TRIM | TO_STRING | URL_ENCODE | URL_DECODE) LPAREN! RPAREN!;
zeroArgString : (TO_UPPER | TO_LOWER | TRIM | TO_STRING | URL_ENCODE | URL_DECODE | ESCAPE_JSON) LPAREN! RPAREN!;
oneArgString : ((SUBSTRING_BEFORE | SUBSTRING_BEFORE_LAST | SUBSTRING_AFTER | SUBSTRING_AFTER_LAST | REPLACE_NULL | REPLACE_EMPTY |
PREPEND | APPEND | FORMAT | STARTS_WITH | ENDS_WITH | CONTAINS | JOIN | JSON_PATH) LPAREN! anyArg RPAREN!) |
(TO_RADIX LPAREN! anyArg (COMMA! anyArg)? RPAREN!);

6
nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/Query.java
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@ -93,6 +93,7 @@ import org.apache.nifi.attribute.expression.language.evaluation.functions.ToUppe
import org.apache.nifi.attribute.expression.language.evaluation.functions.TrimEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.functions.UrlDecodeEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.functions.UrlEncodeEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.functions.EscapeJsonEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.functions.UuidEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.literals.BooleanLiteralEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.literals.NumberLiteralEvaluator;
@ -191,6 +192,7 @@ import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpre
import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.TRUE;
import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.URL_DECODE;
import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.URL_ENCODE;
import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.ESCAPE_JSON;
import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.UUID;
import org.apache.nifi.attribute.expression.language.evaluation.selection.MappingEvaluator;
@ -922,6 +924,10 @@ public class Query {
verifyArgCount(argEvaluators, 0, "urlDecode");
return addToken(new UrlDecodeEvaluator(toStringEvaluator(subjectEvaluator)), "urlDecode");
}
case ESCAPE_JSON: {
verifyArgCount(argEvaluators, 0, "escapeJson");
return addToken(new EscapeJsonEvaluator(toStringEvaluator(subjectEvaluator)), "urlDecode");
}
case SUBSTRING_BEFORE: {
verifyArgCount(argEvaluators, 1, "substringBefore");
return addToken(new SubstringBeforeEvaluator(toStringEvaluator(subjectEvaluator),

47
nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/EscapeJsonEvaluator.java Normal file
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@ -0,0 +1,47 @@
/*
* 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.attribute.expression.language.evaluation.functions;
import java.util.Map;
import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.StringEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
import org.apache.commons.lang3.StringEscapeUtils;
public class EscapeJsonEvaluator extends StringEvaluator {
private final Evaluator<String> subject;
public EscapeJsonEvaluator(final Evaluator<String> subject) {
this.subject = subject;
}
@Override
public QueryResult<String> evaluate(final Map<String, String> attributes) {
final String subjectValue = subject.evaluate(attributes).getValue();
return new StringQueryResult(subjectValue == null ? "" : StringEscapeUtils.escapeJson(subjectValue));
}
@Override
public Evaluator<?> getSubjectEvaluator() {
return subject;
}
}

8
nifi-commons/nifi-expression-language/src/test/java/org/apache/nifi/attribute/expression/language/TestQuery.java
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@ -1314,6 +1314,14 @@ public class TestQuery {
verifyEquals("${line:getDelimitedField(2)}", attributes, " 32");
}
@Test
public void testEscapeJson() {
final Map<String, String> attributes = new HashMap<>();
attributes.put("string", "making air \"QUOTES\".");
verifyEquals("${string:escapeJson()}", attributes, "making air \\\"QUOTES\\\".");
}
private void verifyEquals(final String expression, final Map<String, String> attributes, final Object expectedResult) {
Query.validateExpression(expression, false);
assertEquals(String.valueOf(expectedResult), Query.evaluateExpressions(expression, attributes, null));