mirror of https://github.com/apache/nifi.git
NIFI-6525 - Support JsonPath delete expressions
Signed-off-by: Pierre Villard <pierre.villard.fr@gmail.com> This closes #3632.
This commit is contained in:
mans2singh
Pierre Villard
parent
164e0c4186
commit
2491c51d34
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@ -180,6 +180,7 @@ AND : 'and';
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JOIN : 'join';
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TO_LITERAL : 'literal';
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JSON_PATH : 'jsonPath';
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JSON_PATH_DELETE : 'jsonPathDelete';
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// 2 arg functions
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SUBSTRING : 'substring';
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@ -76,7 +76,7 @@ tokens {
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// functions that return Strings
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zeroArgString : (TO_UPPER | TO_LOWER | TRIM | TO_STRING | URL_ENCODE | URL_DECODE | BASE64_ENCODE | BASE64_DECODE | ESCAPE_JSON | ESCAPE_XML | ESCAPE_CSV | ESCAPE_HTML3 | ESCAPE_HTML4 | UNESCAPE_JSON | UNESCAPE_XML | UNESCAPE_CSV | UNESCAPE_HTML3 | UNESCAPE_HTML4 ) LPAREN! RPAREN!;
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oneArgString : ((SUBSTRING_BEFORE | SUBSTRING_BEFORE_LAST | SUBSTRING_AFTER | SUBSTRING_AFTER_LAST | REPLACE_NULL | REPLACE_EMPTY |
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PREPEND | APPEND | STARTS_WITH | ENDS_WITH | CONTAINS | JOIN | JSON_PATH | FROM_RADIX) LPAREN! anyArg RPAREN!) |
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PREPEND | APPEND | STARTS_WITH | ENDS_WITH | CONTAINS | JOIN | JSON_PATH | JSON_PATH_DELETE | FROM_RADIX) LPAREN! anyArg RPAREN!) |
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(TO_RADIX LPAREN! anyArg (COMMA! anyArg)? RPAREN!);
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twoArgString : ((REPLACE | REPLACE_FIRST | REPLACE_ALL | IF_ELSE) LPAREN! anyArg COMMA! anyArg RPAREN!) |
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((SUBSTRING | FORMAT) LPAREN! anyArg (COMMA! anyArg)? RPAREN!);
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@ -61,6 +61,7 @@ import org.apache.nifi.attribute.expression.language.evaluation.functions.InEval
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import org.apache.nifi.attribute.expression.language.evaluation.functions.IndexOfEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.functions.IsEmptyEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.functions.IsNullEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.functions.JsonPathDeleteEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.functions.JsonPathEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.functions.LastIndexOfEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.functions.LengthEvaluator;
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@ -173,6 +174,7 @@ import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpre
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.IS_NULL;
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.JOIN;
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.JSON_PATH;
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.JSON_PATH_DELETE;
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.LAST_INDEX_OF;
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.LENGTH;
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import static org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser.LESS_THAN;
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@ -912,6 +914,11 @@ public class ExpressionCompiler {
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return addToken(new JsonPathEvaluator(toStringEvaluator(subjectEvaluator),
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toStringEvaluator(argEvaluators.get(0), "first argument to jsonPath")), "jsonPath");
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}
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case JSON_PATH_DELETE: {
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verifyArgCount(argEvaluators, 1, "jsonPathDelete");
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return addToken(new JsonPathDeleteEvaluator(toStringEvaluator(subjectEvaluator),
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toStringEvaluator(argEvaluators.get(0), "first argument to jsonPathDelete")), "jsonPathDelete");
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}
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case IF_ELSE: {
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verifyArgCount(argEvaluators, 2, "ifElse");
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return addToken(new IfElseEvaluator(toBooleanEvaluator(subjectEvaluator),
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@ -0,0 +1,123 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.nifi.attribute.expression.language.evaluation.functions;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import org.apache.nifi.attribute.expression.language.EvaluationContext;
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import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.StringEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
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import org.apache.nifi.attribute.expression.language.evaluation.literals.StringLiteralEvaluator;
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import org.apache.nifi.attribute.expression.language.exception.AttributeExpressionLanguageException;
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import com.jayway.jsonpath.Configuration;
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import com.jayway.jsonpath.DocumentContext;
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import com.jayway.jsonpath.InvalidJsonException;
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import com.jayway.jsonpath.JsonPath;
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import com.jayway.jsonpath.spi.json.JacksonJsonProvider;
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import com.jayway.jsonpath.spi.json.JsonProvider;
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/**
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* Abstract base JsonPath class with utility methods
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*
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* @see JsonPathEvaluator
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* @see JsonPathDeleteEvaluator
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*/
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public abstract class JsonPathBaseEvaluator extends StringEvaluator {
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protected static final StringQueryResult EMPTY_RESULT = new StringQueryResult("");
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protected static final Configuration STRICT_PROVIDER_CONFIGURATION = Configuration.builder().jsonProvider(new JacksonJsonProvider()).build();
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protected static final JsonProvider JSON_PROVIDER = STRICT_PROVIDER_CONFIGURATION.jsonProvider();
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protected final Evaluator<String> subject;
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protected final Evaluator<String> jsonPathExp;
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protected final JsonPath precompiledJsonPathExp;
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public JsonPathBaseEvaluator(final Evaluator<String> subject, final Evaluator<String> jsonPathExp) {
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this.subject = subject;
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this.jsonPathExp = jsonPathExp;
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// if the search string is a literal, we don't need to evaluate it each
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// time; we can just
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// pre-compile it. Otherwise, it must be compiled every time.
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if (jsonPathExp instanceof StringLiteralEvaluator) {
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precompiledJsonPathExp = compileJsonPathExpression(jsonPathExp.evaluate(null).getValue());
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} else {
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precompiledJsonPathExp = null;
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}
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}
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protected DocumentContext getDocumentContext(EvaluationContext context) {
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final String subjectValue = subject.evaluate(context).getValue();
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if (subjectValue == null || subjectValue.length() == 0) {
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throw new AttributeExpressionLanguageException("Subject is empty");
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}
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DocumentContext documentContext = null;
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try {
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documentContext = validateAndEstablishJsonContext(subjectValue);
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} catch (InvalidJsonException e) {
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throw new AttributeExpressionLanguageException("Subject contains invalid JSON: " + subjectValue, e);
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}
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return documentContext;
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}
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protected JsonPath getJsonPath(EvaluationContext context) {
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final JsonPath compiledJsonPath;
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if (precompiledJsonPathExp != null) {
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compiledJsonPath = precompiledJsonPathExp;
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} else {
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compiledJsonPath = compileJsonPathExpression(jsonPathExp.evaluate(context).getValue());
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}
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return compiledJsonPath;
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}
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@Override
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public Evaluator<?> getSubjectEvaluator() {
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return subject;
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}
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static DocumentContext validateAndEstablishJsonContext(final String json) {
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final DocumentContext ctx = JsonPath.using(STRICT_PROVIDER_CONFIGURATION).parse(json);
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return ctx;
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}
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static boolean isJsonScalar(final Object obj) {
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return !(obj instanceof Map || obj instanceof List);
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}
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static String getResultRepresentation(final Object jsonPathResult, final String defaultValue) {
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if (isJsonScalar(jsonPathResult)) {
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return Objects.toString(jsonPathResult, defaultValue);
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} else if (jsonPathResult instanceof List && ((List<?>) jsonPathResult).size() == 1) {
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return getResultRepresentation(((List<?>) jsonPathResult).get(0), defaultValue);
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} else {
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return JSON_PROVIDER.toJson(jsonPathResult);
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}
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}
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static JsonPath compileJsonPathExpression(String exp) {
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try {
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return JsonPath.compile(exp);
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} catch (Exception e) {
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throw new AttributeExpressionLanguageException("Invalid JSON Path expression: " + exp, e);
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}
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}
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}
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@ -0,0 +1,54 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.nifi.attribute.expression.language.evaluation.functions;
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import org.apache.nifi.attribute.expression.language.EvaluationContext;
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import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
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import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
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import com.jayway.jsonpath.DocumentContext;
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import com.jayway.jsonpath.JsonPath;
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/**
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* JsonPathDeleteEvaluator allows delete elements at the specified path
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*/
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public class JsonPathDeleteEvaluator extends JsonPathBaseEvaluator {
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public JsonPathDeleteEvaluator(final Evaluator<String> subject, final Evaluator<String> jsonPathExp) {
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super(subject, jsonPathExp);
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}
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@Override
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public QueryResult<String> evaluate(EvaluationContext context) {
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DocumentContext documentContext = getDocumentContext(context);
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final JsonPath compiledJsonPath = getJsonPath(context);;
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String result = null;
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try {
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result = documentContext.delete(compiledJsonPath).jsonString();
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} catch (Exception e) {
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// assume the path did not match anything in the document
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return EMPTY_RESULT;
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}
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return new StringQueryResult(getResultRepresentation(result, EMPTY_RESULT.getValue()));
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}
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}
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@ -16,70 +16,28 @@
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*/
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package org.apache.nifi.attribute.expression.language.evaluation.functions;
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import com.jayway.jsonpath.Configuration;
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import com.jayway.jsonpath.DocumentContext;
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import com.jayway.jsonpath.InvalidJsonException;
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import com.jayway.jsonpath.JsonPath;
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import com.jayway.jsonpath.spi.json.JacksonJsonProvider;
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import com.jayway.jsonpath.spi.json.JsonProvider;
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import org.apache.nifi.attribute.expression.language.EvaluationContext;
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import org.apache.nifi.attribute.expression.language.StandardEvaluationContext;
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import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
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import org.apache.nifi.attribute.expression.language.evaluation.StringEvaluator;
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import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
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import org.apache.nifi.attribute.expression.language.evaluation.literals.StringLiteralEvaluator;
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import org.apache.nifi.attribute.expression.language.exception.AttributeExpressionLanguageException;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import com.jayway.jsonpath.DocumentContext;
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import com.jayway.jsonpath.JsonPath;
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public class JsonPathEvaluator extends StringEvaluator {
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private static final StringQueryResult EMPTY_RESULT = new StringQueryResult("");
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private static final Configuration STRICT_PROVIDER_CONFIGURATION = Configuration.builder().jsonProvider(new JacksonJsonProvider()).build();
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private static final JsonProvider JSON_PROVIDER = STRICT_PROVIDER_CONFIGURATION.jsonProvider();
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private final Evaluator<String> subject;
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private final Evaluator<String> jsonPathExp;
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private final JsonPath precompiledJsonPathExp;
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/**
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* JsonPathEvaluator provides access to document at the specified JsonPath
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*/
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public class JsonPathEvaluator extends JsonPathBaseEvaluator {
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public JsonPathEvaluator(final Evaluator<String> subject, final Evaluator<String> jsonPathExp) {
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this.subject = subject;
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this.jsonPathExp = jsonPathExp;
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// if the search string is a literal, we don't need to evaluate it each
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// time; we can just
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// pre-compile it. Otherwise, it must be compiled every time.
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if (jsonPathExp instanceof StringLiteralEvaluator) {
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precompiledJsonPathExp = compileJsonPathExpression(jsonPathExp.evaluate(new StandardEvaluationContext(Collections.emptyMap())).getValue());
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} else {
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precompiledJsonPathExp = null;
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}
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super(subject, jsonPathExp);
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}
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@Override
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public QueryResult<String> evaluate(final EvaluationContext evaluationContext) {
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final String subjectValue = subject.evaluate(evaluationContext).getValue();
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if (subjectValue == null || subjectValue.length() == 0) {
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throw new AttributeExpressionLanguageException("Subject is empty");
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}
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DocumentContext documentContext = null;
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try {
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documentContext = validateAndEstablishJsonContext(subjectValue);
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} catch (InvalidJsonException e) {
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throw new AttributeExpressionLanguageException("Subject contains invalid JSON: " + subjectValue, e);
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}
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public QueryResult<String> evaluate(EvaluationContext context) {
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DocumentContext documentContext = getDocumentContext(context);
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final JsonPath compiledJsonPath;
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if (precompiledJsonPathExp != null) {
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compiledJsonPath = precompiledJsonPathExp;
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} else {
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compiledJsonPath = compileJsonPathExpression(jsonPathExp.evaluate(evaluationContext).getValue());
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}
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final JsonPath compiledJsonPath = getJsonPath(context);
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Object result = null;
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try {
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@ -92,38 +50,5 @@ public class JsonPathEvaluator extends StringEvaluator {
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return new StringQueryResult(getResultRepresentation(result, EMPTY_RESULT.getValue()));
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}
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@Override
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public Evaluator<?> getSubjectEvaluator() {
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return subject;
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}
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static DocumentContext validateAndEstablishJsonContext(final String json) {
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final DocumentContext ctx = JsonPath.using(STRICT_PROVIDER_CONFIGURATION).parse(json);
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return ctx;
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}
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static boolean isJsonScalar(final Object obj) {
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return !(obj instanceof Map || obj instanceof List);
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}
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static String getResultRepresentation(final Object jsonPathResult, final String defaultValue) {
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if (isJsonScalar(jsonPathResult)) {
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return Objects.toString(jsonPathResult, defaultValue);
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} else if (jsonPathResult instanceof List && ((List<?>) jsonPathResult).size() == 1) {
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return getResultRepresentation(((List<?>) jsonPathResult).get(0), defaultValue);
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} else {
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return JSON_PROVIDER.toJson(jsonPathResult);
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}
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}
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static JsonPath compileJsonPathExpression(String exp) {
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try {
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return JsonPath.compile(exp);
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} catch (Exception e) {
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throw new AttributeExpressionLanguageException("Invalid JSON Path expression: " + exp, e);
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}
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}
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}
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@ -323,6 +323,69 @@ public class TestQuery {
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}
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}
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@Test
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public void testJsonPathDeleteFirstNameAttribute() throws IOException {
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final Map<String, String> attributes = new HashMap<>();
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String addressBook = getResourceAsString("/json/address-book.json");
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attributes.put("json", addressBook);
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verifyEquals("${json:jsonPath('$.firstName')}", attributes, "John");
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String addressBookAfterDelete = Query.evaluateExpressions("${json:jsonPathDelete('$.firstName')}", attributes, ParameterLookup.EMPTY);
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attributes.clear();
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attributes.put("json", addressBookAfterDelete);
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verifyEquals("${json:jsonPath('$.lastName')}", attributes, "Smith");
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verifyEquals("${json:jsonPath('$.age')}", attributes, "25");
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verifyEquals("${json:jsonPath('$.address.postalCode')}", attributes, "10021-3100");
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verifyEquals("${json:jsonPath(\"$.phoneNumbers[?(@.type=='home')].number\")}", attributes, "212 555-1234");
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verifyEquals("${json:jsonPath('$.phoneNumbers')}", attributes,
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"[{\"type\":\"home\",\"number\":\"212 555-1234\"},{\"type\":\"office\",\"number\":\"646 555-4567\"}]");
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verifyEquals("${json:jsonPath('$.firstName')}", attributes, "");
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}
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@Test
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public void testJsonPathDeleteMissingPath() throws IOException {
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final Map<String, String> attributes = new HashMap<>();
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String addressBook = getResourceAsString("/json/address-book.json");
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attributes.put("json", addressBook);
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String addressBookAfterDelete = Query.evaluateExpressions("${json:jsonPathDelete('$.missing-path')}", attributes, ParameterLookup.EMPTY);
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attributes.clear();
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attributes.put("json", addressBookAfterDelete);
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verifyEquals("${json:jsonPath('$.firstName')}", attributes, "John");
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verifyEquals("${json:jsonPath('$.lastName')}", attributes, "Smith");
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verifyEquals("${json:jsonPath('$.age')}", attributes, "25");
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verifyEquals("${json:jsonPath('$.address')}", attributes,
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"{\"streetAddress\":\"21 2nd Street\",\"city\":\"New York\",\"state\":\"NY\",\"postalCode\":\"10021-3100\"}");
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verifyEquals("${json:jsonPath('$.phoneNumbers')}", attributes,
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"[{\"type\":\"home\",\"number\":\"212 555-1234\"},{\"type\":\"office\",\"number\":\"646 555-4567\"}]");
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}
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@Test
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public void testJsonPathDeleteHomePhoneNumber() throws IOException {
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final Map<String, String> attributes = new HashMap<>();
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String addressBook = getResourceAsString("/json/address-book.json");
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attributes.put("json", addressBook);
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verifyEquals("${json:jsonPath(\"$.phoneNumbers[?(@.type=='home')].number\")}", attributes, "212 555-1234");
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String addressBookAfterDelete = Query.evaluateExpressions("${json:jsonPathDelete(\"$.phoneNumbers[?(@.type=='home')]\")}", attributes, ParameterLookup.EMPTY);
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attributes.clear();
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attributes.put("json", addressBookAfterDelete);
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|
||||
verifyEquals("${json:jsonPath('$.firstName')}", attributes, "John");
|
||||
verifyEquals("${json:jsonPath('$.lastName')}", attributes, "Smith");
|
||||
verifyEquals("${json:jsonPath('$.age')}", attributes, "25");
|
||||
verifyEquals("${json:jsonPath('$.address.postalCode')}", attributes, "10021-3100");
|
||||
verifyEquals("${json:jsonPath(\"$.phoneNumbers[?(@.type=='home')].number\")}", attributes, "[]");
|
||||
verifyEquals("${json:jsonPath('$.phoneNumbers')}", attributes,
|
||||
"{\"type\":\"office\",\"number\":\"646 555-4567\"}");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testEmbeddedExpressionsAndQuotesWithProperties() {
|
||||
final Map<String, String> attributes = new HashMap<>();
|
||||
|
|
|
|||
|
|
@ -1576,6 +1576,58 @@ Expressions will provide the following results:
|
|||
|
||||
An empty subject value or a subject value with an invalid JSON document results in an exception bulletin.
|
||||
|
||||
|
||||
[.function]
|
||||
=== jsonPathDelete
|
||||
|
||||
*Description*: [.description]#The `jsonPathDelete` function deletes the specified JsonPath from a Subject JSON and returns string
|
||||
form of the updated JSON.#
|
||||
|
||||
*Subject Type*: [.subject]#String#
|
||||
|
||||
*Arguments*:
|
||||
[.argName]#_jsonPath_# : [.argDesc]#the JSON path expression to delete from the Subject.#
|
||||
|
||||
*Return Type*: [.returnType]#String#
|
||||
|
||||
*Examples*: If the "myJson" attribute is
|
||||
|
||||
..........
|
||||
{
|
||||
"firstName": "John",
|
||||
"lastName": "Smith",
|
||||
"isAlive": true,
|
||||
"age": 25,
|
||||
"address": {
|
||||
"streetAddress": "21 2nd Street",
|
||||
"city": "New York",
|
||||
"state": "NY",
|
||||
"postalCode": "10021-3100"
|
||||
},
|
||||
"phoneNumbers": [
|
||||
{
|
||||
"type": "home",
|
||||
"number": "212 555-1234"
|
||||
},
|
||||
{
|
||||
"type": "office",
|
||||
"number": "646 555-4567"
|
||||
}
|
||||
],
|
||||
"children": [],
|
||||
"spouse": null
|
||||
}
|
||||
..........
|
||||
|
||||
.jsonPathDelete Examples
|
||||
|===================================================================
|
||||
| Expression | Value
|
||||
| `${myJson:jsonPathDelete('$.firstName')}` | `{"lastName":"Smith","age":25,"address":{"streetAddress":"21 2nd Street","city":"New York","state":"NY","postalCode":"10021-3100"},"phoneNumbers":[{"type":"home","number":"212 555-1234"},{"type":"office","number":"646 555-4567"}]}`
|
||||
| `${myJson:jsonPathDelete('$.missing-path')}` | Returns original JSON document
|
||||
|===================================================================
|
||||
|
||||
An empty subject value or a subject value with an invalid JSON document results in an exception bulletin.
|
||||
|
||||
[[numbers]]
|
||||
== Mathematical Operations and Numeric Manipulation
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue