/*
* 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.PathToken;
import com.jayway.jsonpath.internal.PathTokenizer;
import com.jayway.jsonpath.internal.IOUtils;
import com.jayway.jsonpath.internal.filter.PathTokenFilter;
import com.jayway.jsonpath.spi.HttpProviderFactory;
import com.jayway.jsonpath.spi.JsonProvider;
import com.jayway.jsonpath.spi.JsonProviderFactory;
import org.apache.commons.lang.StringUtils;
import java.io.*;
import java.net.URL;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import static java.util.Arrays.asList;
import static org.apache.commons.lang.Validate.*;
/**
* <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/>
* <code>
* 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
* }
* }
* }";
* </code>
* <p/>
* A JsonPath can be compiled and used as shown:
* <p/>
* <code>
* JsonPath path = JsonPath.compile("$.store.book[1]");
* <br/>
* List<Object> books = path.read(json);
* </code>
* </p>
* Or:
* <p/>
* <code>
* List<Object> authors = JsonPath.read(json, "$.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>
*
* @author Kalle Stenflo
*/
public class JsonPath {
private static Pattern DEFINITE_PATH_PATTERN = Pattern.compile(".*(\\.\\.|\\*|\\[[\\\\/]|\\?|,|:\\s?\\]|\\[\\s?:|>|\\(|<|=|\\+).*");
private PathTokenizer tokenizer;
private LinkedList<Filter> filters;
public JsonPath(String jsonPath, Filter[] filters) {
if (jsonPath == null ||
jsonPath.trim().length() == 0 ||
jsonPath.matches("[^\\?\\+\\=\\-\\*\\/\\!]\\(")) {
throw new InvalidPathException("Invalid path");
}
int filterCountInPath = StringUtils.countMatches(jsonPath, "[?]");
isTrue(filterCountInPath == filters.length, "Filters in path ([?]) does not match provided filters.");
this.tokenizer = new PathTokenizer(jsonPath);
this.filters = new LinkedList<Filter>();
this.filters.addAll(asList(filters));
}
PathTokenizer getTokenizer(){
return this.tokenizer;
}
public JsonPath copy(){
return new JsonPath(tokenizer.getPath(), filters.toArray(new Filter[0]));
}
/**
* Returns the string representation of this JsonPath
*
* @return path as String
*/
public String getPath() {
return this.tokenizer.getPath();
}
/**
* 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[1,2]
* $.store.book[?(@.category = 'fiction')]
*
* @return true if path is definite (points to single item)
*/
public static boolean isPathDefinite(String path) {
String preparedPath = path.replaceAll("\"[^\"\\\\\\n\r]*\"", "");
return !DEFINITE_PATH_PATTERN.matcher(preparedPath).matches();
}
/**
* 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[1,2]
* $.store.book[?(@.category = 'fiction')]
*
* @return true if path is definite (points to single item)
*/
public boolean isPathDefinite() {
return JsonPath.isPathDefinite(getPath());
}
/**
* 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 list of objects matched by the given path
*/
@SuppressWarnings({"unchecked"})
public <T> T read(Object jsonObject) {
notNull(jsonObject, "json can not be null");
JsonProvider jsonProvider = JsonProviderFactory.createProvider();
if (!jsonProvider.isMap(jsonObject) && !jsonProvider.isList(jsonObject)) {
throw new IllegalArgumentException("Invalid container object");
}
LinkedList<Filter> contextFilters = new LinkedList<Filter>(filters);
Object result = jsonObject;
boolean inArrayContext = false;
for (PathToken pathToken : tokenizer) {
PathTokenFilter filter = pathToken.getFilter();
result = filter.filter(result, jsonProvider, contextFilters, inArrayContext);
if (!inArrayContext) {
inArrayContext = filter.isArrayFilter();
}
}
return (T) result;
}
/**
* 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) {
notEmpty(json, "json can not be null or empty");
return (T) read(JsonProviderFactory.createProvider().parse(json));
}
/**
* 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 {
notNull(jsonURL, "json URL can not be null");
InputStream in = null;
try {
in = HttpProviderFactory.getProvider().get(jsonURL);
return (T) read(JsonProviderFactory.createProvider().parse(in));
} finally {
IOUtils.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 {
notNull(jsonFile, "json file can not be null");
isTrue(jsonFile.exists(), "json file does not exist");
FileInputStream fis = null;
try {
fis = new FileInputStream(jsonFile);
return (T) read(JsonProviderFactory.createProvider().parse(fis));
} finally {
IOUtils.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 {
notNull(jsonInputStream, "json input stream can not be null");
try {
return (T) read(JsonProviderFactory.createProvider().parse(jsonInputStream));
} finally {
IOUtils.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, Filter... 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 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, Filter... filters) {
notEmpty(json, "json can not be null or empty");
notEmpty(jsonPath, "jsonPath can not be null or empty");
return (T) compile(jsonPath, filters).read(json);
}
/**
* 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, Filter... filters) {
notNull(json, "json can not be null");
notNull(jsonPath, "jsonPath can not be null");
return (T) compile(jsonPath, filters).read(json);
}
/**
* 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, Filter... filters) throws IOException {
notNull(jsonURL, "json URL can not be null");
notEmpty(jsonPath, "jsonPath can not be null or empty");
return (T) compile(jsonPath, filters).read(jsonURL);
}
/**
* 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, Filter... filters) throws IOException {
notNull(jsonFile, "json file can not be null");
notEmpty(jsonPath, "jsonPath can not be null or empty");
return (T) compile(jsonPath, filters).read(jsonFile);
}
/**
* 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, Filter... filters) throws IOException {
notNull(jsonInputStream, "json input stream can not be null");
notEmpty(jsonPath, "jsonPath can not be null or empty");
return (T) compile(jsonPath, filters).read(jsonInputStream);
}
}