root
/
spring-boot
mirror of https://github.com/spring-projects/spring-boot.git
1
0
Fork 0
Code Issues Actions 12 Packages Projects Releases Wiki Activity

Merge pull request #12428 from atelechev 

* atelechev/refactor-spring-boot-json-parsers:
  Polish "refactor spring-boot JSON parser"
  Refactor spring-boot JSON parsers
This commit is contained in:
Phillip Webb 2018-03-14 15:01:39 -07:00
parent a4b0be089d 90949669be
commit 1412e7e690
8 changed files with 132 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/AbstractJsonParser.java Normal file
View File

@ -0,0 +1,66 @@
/*
* Copyright 2012-2018 the original author or authors.
*
* Licensed 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.springframework.boot.json;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.function.Function;
import org.springframework.util.ReflectionUtils;
/**
* Base class for parsers wrapped or implemented in this package.
*
* @author Anton Telechev
* @author Phillip Webb
*/
abstract class AbstractJsonParser implements JsonParser {
protected final Map<String, Object> parseMap(String json,
Function<String, Map<String, Object>> parser) {
return trimParse(json, "{", parser);
}
protected final List<Object> parseList(String json,
Function<String, List<Object>> parser) {
return trimParse(json, "[", parser);
}
protected final <T> T trimParse(String json, String prefix,
Function<String, T> parser) {
String trimmed = (json == null ? "" : json.trim());
if (trimmed.startsWith(prefix)) {
return parser.apply(trimmed);
}
throw new JsonParseException();
}
protected final <T> T tryParse(Callable<T> parser, Class<? extends Exception> check) {
try {
return parser.call();
}
catch (Exception ex) {
if (check.isAssignableFrom(ex.getClass())) {
throw new JsonParseException(ex);
}
ReflectionUtils.rethrowRuntimeException(ex);
throw new IllegalStateException(ex);
}
}
}

18
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/BasicJsonParser.java
View File

@ -35,28 +35,16 @@ import org.springframework.util.StringUtils;
* @since 1.2.0
* @see JsonParserFactory
*/
public class BasicJsonParser implements JsonParser {
public class BasicJsonParser extends AbstractJsonParser {
@Override
public Map<String, Object> parseMap(String json) {
if (json != null) {
json = json.trim();
if (json.startsWith("{")) {
return parseMapInternal(json);
}
}
throw new IllegalArgumentException("Cannot parse JSON");
return parseMap(json, this::parseMapInternal);
}
@Override
public List<Object> parseList(String json) {
if (json != null) {
json = json.trim();
if (json.startsWith("[")) {
return parseListInternal(json);
}
}
throw new IllegalArgumentException("Cannot parse JSON");
return parseList(json, this::parseListInternal);
}
private List<Object> parseListInternal(String json) {

22
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/GsonJsonParser.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2017 the original author or authors.
* Copyright 2012-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -31,7 +31,7 @@ import com.google.gson.reflect.TypeToken;
* @since 1.2.0
* @see JsonParserFactory
*/
public class GsonJsonParser implements JsonParser {
public class GsonJsonParser extends AbstractJsonParser {
private static final TypeToken<?> MAP_TYPE = new MapTypeToken();
@ -41,24 +41,14 @@ public class GsonJsonParser implements JsonParser {
@Override
public Map<String, Object> parseMap(String json) {
if (json != null) {
json = json.trim();
if (json.startsWith("{")) {
return this.gson.fromJson(json, MAP_TYPE.getType());
}
}
throw new IllegalArgumentException("Cannot parse JSON");
return parseMap(json,
(trimmed) -> this.gson.fromJson(trimmed, MAP_TYPE.getType()));
}
@Override
public List<Object> parseList(String json) {
if (json != null) {
json = json.trim();
if (json.startsWith("[")) {
return this.gson.fromJson(json, LIST_TYPE.getType());
}
}
throw new IllegalArgumentException("Cannot parse JSON");
return parseList(json,
(trimmed) -> this.gson.fromJson(trimmed, LIST_TYPE.getType()));
}
private static final class MapTypeToken extends TypeToken<Map<String, Object>> {

20
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/JacksonJsonParser.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2017 the original author or authors.
* Copyright 2012-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -28,7 +28,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
* @author Dave Syer
* @see JsonParserFactory
*/
public class JacksonJsonParser implements JsonParser {
public class JacksonJsonParser extends AbstractJsonParser {
private static final TypeReference<?> MAP_TYPE = new MapTypeReference();
@ -38,22 +38,14 @@ public class JacksonJsonParser implements JsonParser {
@Override
public Map<String, Object> parseMap(String json) {
try {
return getObjectMapper().readValue(json, MAP_TYPE);
}
catch (Exception ex) {
throw new IllegalArgumentException("Cannot parse JSON", ex);
}
return tryParse(() -> getObjectMapper().readValue(json, MAP_TYPE),
Exception.class);
}
@Override
public List<Object> parseList(String json) {
try {
return getObjectMapper().readValue(json, LIST_TYPE);
}
catch (Exception ex) {
throw new IllegalArgumentException("Cannot parse JSON", ex);
}
return tryParse(() -> getObjectMapper().readValue(json, LIST_TYPE),
Exception.class);
}
private ObjectMapper getObjectMapper() {

36
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/JsonParseException.java Normal file
View File

@ -0,0 +1,36 @@
/*
* Copyright 2012-2018 the original author or authors.
*
* Licensed 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.springframework.boot.json;
/**
* {@link IllegalArgumentException} thrown when source JSON is invalid.
*
* @author Anton Telechev
* @author Phillip Webb
* @since 2.0.1
*/
public class JsonParseException extends IllegalArgumentException {
public JsonParseException() {
this(null);
}
public JsonParseException(Throwable cause) {
super("Cannot parse JSON", cause);
}
}

8
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/JsonParser.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2017 the original author or authors.
* Copyright 2012-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -35,14 +35,16 @@ public interface JsonParser {
* Parse the specified JSON string into a Map.
* @param json the JSON to parse
* @return the parsed JSON as a map
* @throws JsonParseException if the JSON cannot be parsed
*/
Map<String, Object> parseMap(String json);
Map<String, Object> parseMap(String json) throws JsonParseException;
/**
* Parse the specified JSON string into a List.
* @param json the JSON to parse
* @return the parsed JSON as a list
* @throws JsonParseException if the JSON cannot be parsed
*/
List<Object> parseList(String json);
List<Object> parseList(String json) throws JsonParseException;
}

20
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/JsonSimpleJsonParser.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2017 the original author or authors.
* Copyright 2012-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -30,28 +30,20 @@ import org.json.simple.parser.ParseException;
* @since 1.2.0
* @see JsonParserFactory
*/
public class JsonSimpleJsonParser implements JsonParser {
public class JsonSimpleJsonParser extends AbstractJsonParser {
@Override
@SuppressWarnings("unchecked")
public Map<String, Object> parseMap(String json) {
try {
return (Map<String, Object>) new JSONParser().parse(json);
}
catch (ParseException ex) {
throw new IllegalArgumentException("Cannot parse JSON", ex);
}
return (Map<String, Object>) tryParse(() -> new JSONParser().parse(json),
ParseException.class);
}
@Override
@SuppressWarnings("unchecked")
public List<Object> parseList(String json) {
try {
return (List<Object>) new JSONParser().parse(json);
}
catch (ParseException ex) {
throw new IllegalArgumentException("Cannot parse JSON", ex);
}
return (List<Object>) tryParse(() -> new JSONParser().parse(json),
ParseException.class);
}
}

20
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/YamlJsonParser.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2017 the original author or authors.
* Copyright 2012-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -28,30 +28,18 @@ import org.yaml.snakeyaml.Yaml;
* @author Jean de Klerk
* @see JsonParserFactory
*/
public class YamlJsonParser implements JsonParser {
public class YamlJsonParser extends AbstractJsonParser {
@Override
@SuppressWarnings("unchecked")
public Map<String, Object> parseMap(String json) {
if (json != null) {
json = json.trim();
if (json.startsWith("{")) {
return new Yaml().loadAs(json, Map.class);
}
}
throw new IllegalArgumentException("Cannot parse JSON");
return parseMap(json, (trimmed) -> new Yaml().loadAs(trimmed, Map.class));
}
@Override
@SuppressWarnings("unchecked")
public List<Object> parseList(String json) {
if (json != null) {
json = json.trim();
if (json.startsWith("[")) {
return new Yaml().loadAs(json, List.class);
}
}
throw new IllegalArgumentException("Cannot parse JSON");
return parseList(json, (trimmed) -> new Yaml().loadAs(trimmed, List.class));
}
}