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JsonPath仓库
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JsonPath/json-path/src/main/java/com/jayway/jsonpath/JsonPath.java

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/*
* Copyright 2011 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 com.jayway.jsonpath;
import com.jayway.jsonpath.internal.JsonReader;
import com.jayway.jsonpath.internal.Path;
import com.jayway.jsonpath.internal.PathCompiler;
import com.jayway.jsonpath.internal.Utils;
import com.jayway.jsonpath.spi.http.HttpProviderFactory;
import com.jayway.jsonpath.spi.json.JsonProvider;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import static com.jayway.jsonpath.internal.Utils.*;
/**
* <p/>
* JsonPath is to JSON what XPATH is to XML, a simple way to extract parts of a given document. JsonPath is
* available in many programming languages such as Javascript, Python and PHP.
* <p/>
* JsonPath allows you to compile a json path string to use it many times or to compile and apply in one
* single on demand operation.
* <p/>
* Given the Json document:
* <p/>
* <pre>
* String json =
* "{
* "store":
* {
* "book":
* [
* {
* "category": "reference",
* "author": "Nigel Rees",
* "title": "Sayings of the Century",
* "price": 8.95
* },
* {
* "category": "fiction",
* "author": "Evelyn Waugh",
* "title": "Sword of Honour",
* "price": 12.99
* }
* ],
* "bicycle":
* {
* "color": "red",
* "price": 19.95
* }
* }
* }";
* </pre>
* <p/>
* A JsonPath can be compiled and used as shown:
* <p/>
* <code>
* JsonPath path = JsonPath.compile("$.store.book[1]");
* <br/>
* List&lt;Object&gt; books = path.read(json);
* </code>
* </p>
* Or:
* <p/>
* <code>
* List&lt;Object&gt; authors = JsonPath.read(json, "$.store.book[*].author")
* </code>
* <p/>
* If the json path returns a single value (is definite):
* </p>
* <code>
* String author = JsonPath.read(json, "$.store.book[1].author")
* </code>
*/
public class JsonPath {
private final Path path;
private JsonPath(String jsonPath, Predicate[] filters) {
notNull(jsonPath, "path can not be null");
this.path = PathCompiler.compile(jsonPath, filters);
}
/**
* Returns the string representation of this JsonPath
*
* @return path as String
*/
public String getPath() {
return this.path.toString();
}
/**
* @see JsonPath#isDefinite()
*/
public static boolean isPathDefinite(String path) {
return compile(path).isDefinite();
}
/**
* Checks if a path points to a single item or if it potentially returns multiple items
* <p/>
* a path is considered <strong>not</strong> definite if it contains a scan fragment ".."
* or an array position fragment that is not based on a single index
* <p/>
* <p/>
* definite path examples are:
* <p/>
* $store.book
* $store.book[1].title
* <p/>
* not definite path examples are:
* <p/>
* $..book
* $.store.book[*]
* $.store.book[1,2]
* $.store.book[?(@.category = 'fiction')]
*
* @return true if path is definite (points to single item)
*/
public boolean isDefinite() {
return path.isDefinite();
}
/**
* Applies this JsonPath to the provided json document.
* Note that the document must be identified as either a List or Map by
* the {@link JsonProvider}
*
* @param jsonObject a container Object
* @param <T> expected return type
* @return object(s) matched by the given path
*/
@SuppressWarnings({"unchecked"})
public <T> T read(Object jsonObject) {
return read(jsonObject, Configuration.defaultConfiguration());
}
/**
* Applies this JsonPath to the provided json document.
* Note that the document must be identified as either a List or Map by
* the {@link JsonProvider}
*
* @param jsonObject a container Object
* @param configuration configuration to use
* @param <T> expected return type
* @return object(s) matched by the given path
*/
@SuppressWarnings("unchecked")
public <T> T read(Object jsonObject, Configuration configuration) {
boolean optAsPathList = configuration.containsOption(Option.AS_PATH_LIST);
boolean optAlwaysReturnList = configuration.containsOption(Option.ALWAYS_RETURN_LIST);
boolean optSuppressExceptions = configuration.containsOption(Option.SUPPRESS_EXCEPTIONS);
try {
if(optAsPathList){
return (T)path.evaluate(jsonObject, jsonObject, configuration).getPath();
} else {
Object res = path.evaluate(jsonObject, jsonObject, configuration).getValue();
if(optAlwaysReturnList && path.isDefinite()){
Object array = configuration.jsonProvider().createArray();
configuration.jsonProvider().setProperty(array, 0, res);
return (T)array;
} else {
return (T)res;
}
}
} catch (RuntimeException e){
if(!optSuppressExceptions){
throw e;
}
}
if(optAsPathList){
return (T)configuration.jsonProvider().createArray();
} else {
if(optAlwaysReturnList){
return (T)configuration.jsonProvider().createArray();
} else {
return (T)(path.isDefinite() ? null : configuration.jsonProvider().createArray());
}
}
}
/**
* Applies this JsonPath to the provided json string
*
* @param json a json string
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public <T> T read(String json) {
return read(json, Configuration.defaultConfiguration());
}
/**
* Applies this JsonPath to the provided json string
*
* @param json a json string
* @param configuration configuration to use
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public <T> T read(String json, Configuration configuration) {
notEmpty(json, "json can not be null or empty");
notNull(configuration, "jsonProvider can not be null");
return read(configuration.jsonProvider().parse(json), configuration);
}
/**
* Applies this JsonPath to the provided json URL
*
* @param jsonURL url to read from
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(URL jsonURL) throws IOException {
return read(jsonURL, Configuration.defaultConfiguration());
}
/**
* Applies this JsonPath to the provided json URL
*
* @param jsonURL url to read from
* @param configuration configuration to use
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(URL jsonURL, Configuration configuration) throws IOException {
notNull(jsonURL, "json URL can not be null");
notNull(configuration, "jsonProvider can not be null");
InputStream in = null;
try {
in = HttpProviderFactory.getProvider().get(jsonURL);
return read(in, "UTF-8", configuration);
} finally {
Utils.closeQuietly(in);
}
}
/**
* Applies this JsonPath to the provided json file
*
* @param jsonFile file to read from
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(File jsonFile) throws IOException {
return read(jsonFile, Configuration.defaultConfiguration());
}
/**
* Applies this JsonPath to the provided json file
*
* @param jsonFile file to read from
* @param configuration configuration to use
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(File jsonFile, Configuration configuration) throws IOException {
notNull(jsonFile, "json file can not be null");
isTrue(jsonFile.exists(), "json file does not exist");
notNull(configuration, "jsonProvider can not be null");
FileInputStream fis = null;
try {
fis = new FileInputStream(jsonFile);
return read(fis, configuration);
} finally {
Utils.closeQuietly(fis);
}
}
/**
* Applies this JsonPath to the provided json input stream
*
* @param jsonInputStream input stream to read from
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(InputStream jsonInputStream) throws IOException {
return read(jsonInputStream, Configuration.defaultConfiguration());
}
/**
* Applies this JsonPath to the provided json input stream
*
* @param jsonInputStream input stream to read from
* @param configuration configuration to use
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(InputStream jsonInputStream, Configuration configuration) throws IOException {
notNull(jsonInputStream, "json input stream can not be null");
notNull(configuration, "configuration can not be null");
return read(jsonInputStream, "UTF-8", configuration);
}
/**
* Applies this JsonPath to the provided json input stream
*
* @param jsonInputStream input stream to read from
* @param configuration configuration to use
* @param <T> expected return type
* @return list of objects matched by the given path
* @throws IOException
*/
@SuppressWarnings({"unchecked"})
public <T> T read(InputStream jsonInputStream, String charset, Configuration configuration) throws IOException {
notNull(jsonInputStream, "json input stream can not be null");
notNull(charset, "charset can not be null");
notNull(configuration, "configuration can not be null");
try {
return read(configuration.jsonProvider().parse(jsonInputStream, charset), configuration);
} finally {
Utils.closeQuietly(jsonInputStream);
}
}
// --------------------------------------------------------
//
// Static factory methods
//
// --------------------------------------------------------
/**
* Compiles a JsonPath
*
* @param jsonPath to compile
* @param filters filters to be applied to the filter place holders [?] in the path
* @return compiled JsonPath
*/
public static JsonPath compile(String jsonPath, Predicate... filters) {
notEmpty(jsonPath, "json can not be null or empty");
return new JsonPath(jsonPath, filters);
}
// --------------------------------------------------------
//
// Static utility functions
//
// --------------------------------------------------------
/**
* Creates a new JsonPath and applies it to the provided Json object
*
* @param json a json object
* @param jsonPath the json path
* @param filters filters to be applied to the filter place holders [?] in the path
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public static <T> T read(Object json, String jsonPath, Predicate... filters) {
return parse(json).read(jsonPath, filters);
}
/**
* Creates a new JsonPath and applies it to the provided Json string
*
* @param json a json string
* @param jsonPath the json path
* @param filters filters to be applied to the filter place holders [?] in the path
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public static <T> T read(String json, String jsonPath, Predicate... filters) {
return new JsonReader().parse(json).read(jsonPath, filters);
}
/**
* Creates a new JsonPath and applies it to the provided Json object
*
* @param jsonURL url pointing to json doc
* @param jsonPath the json path
* @param filters filters to be applied to the filter place holders [?] in the path
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public static <T> T read(URL jsonURL, String jsonPath, Predicate... filters) throws IOException {
return new JsonReader().parse(jsonURL).read(jsonPath, filters);
}
/**
* Creates a new JsonPath and applies it to the provided Json object
*
* @param jsonFile json file
* @param jsonPath the json path
* @param filters filters to be applied to the filter place holders [?] in the path
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public static <T> T read(File jsonFile, String jsonPath, Predicate... filters) throws IOException {
return new JsonReader().parse(jsonFile).read(jsonPath, filters);
}
/**
* Creates a new JsonPath and applies it to the provided Json object
*
* @param jsonInputStream json input stream
* @param jsonPath the json path
* @param filters filters to be applied to the filter place holders [?] in the path
* @param <T> expected return type
* @return list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public static <T> T read(InputStream jsonInputStream, String jsonPath, Predicate... filters) throws IOException {
return new JsonReader().parse(jsonInputStream).read(jsonPath, filters);
}
// --------------------------------------------------------
//
// Static Fluent API
//
// --------------------------------------------------------
/**
* Creates a {@link ParseContext} that can be used to parse a given JSON input.
*
* @param configuration configuration to use when parsing JSON
* @return a parsing context based on given configuration
*/
public static ParseContext using(Configuration configuration) {
return new JsonReader(configuration);
}
/**
* Creates a {@link ParseContext} that will parse a given JSON input.
*
* @param provider jsonProvider to use when parsing JSON
* @return a parsing context based on given jsonProvider
*/
public static ParseContext using(JsonProvider provider) {
return new JsonReader(Configuration.builder().jsonProvider(provider).build());
}
/**
* Parses the given JSON input using the default {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json input
* @return a read context
*/
public static ReadContext parse(Object json) {
return new JsonReader().parse(json);
}
/**
* Parses the given JSON input using the default {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json string
* @return a read context
*/
public static ReadContext parse(String json) {
return new JsonReader().parse(json);
}
/**
* Parses the given JSON input using the default {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json stream
* @return a read context
*/
public static ReadContext parse(InputStream json) {
return new JsonReader().parse(json);
}
/**
* Parses the given JSON input using the default {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json file
* @return a read context
*/
public static ReadContext parse(File json) throws IOException {
return new JsonReader().parse(json);
}
/**
* Parses the given JSON input using the default {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json url
* @return a read context
*/
public static ReadContext parse(URL json) throws IOException {
return new JsonReader().parse(json);
}
/**
* Parses the given JSON input using the provided {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json input
* @return a read context
*/
public static ReadContext parse(Object json, Configuration configuration) {
return new JsonReader(configuration).parse(json);
}
/**
* Parses the given JSON input using the provided {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json input
* @return a read context
*/
public static ReadContext parse(String json, Configuration configuration) {
return new JsonReader(configuration).parse(json);
}
/**
* Parses the given JSON input using the provided {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json input
* @return a read context
*/
public static ReadContext parse(InputStream json, Configuration configuration) {
return new JsonReader(configuration).parse(json);
}
/**
* Parses the given JSON input using the provided {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json input
* @return a read context
*/
public static ReadContext parse(File json, Configuration configuration) throws IOException {
return new JsonReader(configuration).parse(json);
}
/**
* Parses the given JSON input using the provided {@link Configuration} and
* returns a {@link ReadContext} for path evaluation
*
* @param json input
* @return a read context
*/
public static ReadContext parse(URL json, Configuration configuration) throws IOException {
return new JsonReader(configuration).parse(json);
}
}