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/*-
* ============LICENSE_START=======================================================
* PROJECT
* ================================================================================
* Copyright (C) 2018 Nokia Networks Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.commonFunction;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
/**
* This class is a wrapper for 2 most used entities of org.json lib: JSONArray and JSONObject and
* comprises utility methods for fast access of json structures without need to explicitly coerce between them.
* While using this, bear in mind it does not contain exception handling - it is assumed that when using, the parsed json structure is known.
*
* @author koblosz
*/
public class AnyNode {
private static final Logger LOGGER = LoggerFactory.getLogger(AnyNode.class);
private Object obj;
/**
* @param filePath
* @return
* @throws IOException
*/
public static AnyNode parse(String filePath) throws IOException {
try (FileReader fr = new FileReader(filePath)) {
JSONTokener tokener = new JSONTokener(fr);
return new AnyNode(new JSONObject(tokener));
} catch (FileNotFoundException | JSONException e1) {
LOGGER.error("Could not find or parse file under path %s due to: %s", filePath, e1.toString());
e1.printStackTrace();
throw e1;
}
}
/**
* Returns keyset of underlying object. It is assumed that underlying object is of type org.json.JSONObject.
*
* @return Set of string keys present in underlying JSONObject
*/
public Set<String> getKeys() {
return asJsonObject().keySet();
}
/**
* Returns value associated with specified key wrapped with AnyValue object. It is assumed that this is of type org.json.JSONObject.
*
* @param key A key string
* @return The AnyNode object associated with given key.
*/
public AnyNode get(String key) {
return new AnyNode(asJsonObject().get(key));
}
/**
* Returns value under specified index wrapped with AnyValue object. It is assumed that this is of type org.json.JSONArray.
*
* @param idx An index of JSONArray
* @return The AnyNode object associated with given index.
*/
public AnyNode get(int idx) {
return new AnyNode(asJsonArray().get(idx));
}
/**
* Returns int assuming this can be coerced to int.
*/
public int asInt() {
return (int) this.obj;
}
/**
* Returns string representation of this. If it happens to have null, the value is treated as org.json.JSONObject.NULL and "null" string is returned then.
*
* @return A String
*/
public String asString() {
return this.obj != JSONObject.NULL ? (String) this.obj : JSONObject.NULL.toString();
}
public String toString() {
return this.obj.toString();
}
/**
* Converts underlying object to String-to-Object map. It is assumed that underlying object is of type org.json.JSONObject.
*
* @return A map.
*/
public Map<String, Object> asRawMap() {
return asJsonObject().toMap();
}
/**
* Returns optional of object under specified key, wrapped with AnyNode object. If underlying object is not of type org.json.JSONObject, then Optional.empty will be returned.
*
* @param key A key string
*/
public Optional<AnyNode> getAsOptional(String key) {
AnyNode result = null;
try {
result = get(key);
} catch (JSONException ex) {
}
return Optional.ofNullable(result);
}
public JSONObject asJsonObject() {
return (JSONObject) this.obj;
}
/**
* Converts underlying object to map representation with map values wrapped with AnyNode object. It is assumed that underlying object is of type org.json.JSONObject.
*/
public Map<String, AnyNode> asMap() {
Map<String, AnyNode> map = new HashMap<>();
getKeys().forEach(key -> map.put(key, get(key)));
return map;
}
/**
* Converts underlying object to map representation with map values wrapped with AnyNode object. It is assumed that underlying object is of type org.json.JSONObject.
*/
public java.util.List<AnyNode> asList() {
return asStream().collect(Collectors.toList());
}
/**
* Converts this object to stream of underlying objects wrapped with AnyNode class. It is assumed that this is of type JSONArray.
*/
public Stream<AnyNode> asStream() {
return StreamSupport.stream(((JSONArray) this.obj).spliterator(), false).map(AnyNode::new);
}
/**
* Checks if specified key is present in this. It is assumed that this is of type JSONObject.
*/
public boolean hasKey(String key) {
return getAsOptional(key).isPresent();
}
/**
* Returns empty AnyNode (with null inside)
*/
public static AnyNode nullValue() {
return new AnyNode(JSONObject.NULL.toString());
}
private JSONArray asJsonArray() {
return (JSONArray) this.obj;
}
private AnyNode(Object object) {
this.obj = object;
}
}
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