com.jayway.jsonpath.spi.json.GsonJsonProvider Maven / Gradle / Ivy
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Java port of Stefan Goessner JsonPath.
/*
* 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.spi.json;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonPrimitive;
import com.jayway.jsonpath.InvalidJsonException;
import com.jayway.jsonpath.JsonPathException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
public class GsonJsonProvider extends AbstractJsonProvider {
private static final JsonParser PARSER = new JsonParser();
private final Gson gson;
/**
* Initializes the {@code GsonJsonProvider} using the default {@link Gson} object.
*/
public GsonJsonProvider() {
this(new Gson());
}
/**
* Initializes the {@code GsonJsonProvider} using a customized {@link Gson} object.
*
* @param gson the customized Gson object.
*/
public GsonJsonProvider(final Gson gson) {
this.gson = gson;
}
public Object unwrap(final Object o) {
if (o == null) {
return null;
}
if (!(o instanceof JsonElement)) {
return o;
}
JsonElement e = (JsonElement) o;
if (e.isJsonNull()) {
return null;
} else if (e.isJsonPrimitive()) {
JsonPrimitive p = e.getAsJsonPrimitive();
if (p.isString()) {
return p.getAsString();
} else if (p.isBoolean()) {
return p.getAsBoolean();
} else if (p.isNumber()) {
return unwrapNumber(p.getAsNumber());
}
}
return o;
}
private static boolean isPrimitiveNumber(final Number n) {
return n instanceof Integer ||
n instanceof Float ||
n instanceof Double ||
n instanceof Long ||
n instanceof BigDecimal ||
n instanceof BigInteger;
}
private static Number unwrapNumber(final Number n) {
Number unwrapped;
if (!isPrimitiveNumber(n)) {
BigDecimal bigDecimal = new BigDecimal(n.toString());
if (bigDecimal.scale() <= 0) {
if (bigDecimal.abs().compareTo(new BigDecimal(Integer.MAX_VALUE)) <= 0) {
unwrapped = bigDecimal.intValue();
} else if (bigDecimal.abs().compareTo(new BigDecimal(Long.MAX_VALUE)) <= 0){
unwrapped = bigDecimal.longValue();
} else {
unwrapped = bigDecimal;
}
} else {
final double doubleValue = bigDecimal.doubleValue();
if (BigDecimal.valueOf(doubleValue).compareTo(bigDecimal) != 0) {
unwrapped = bigDecimal;
} else {
unwrapped = doubleValue;
}
}
} else {
unwrapped = n;
}
return unwrapped;
}
@Override
public Object parse(final String json) throws InvalidJsonException {
return PARSER.parse(json);
}
@Override
public Object parse(final InputStream jsonStream, final String charset) throws InvalidJsonException {
try {
return PARSER.parse(new InputStreamReader(jsonStream, charset));
} catch (UnsupportedEncodingException e) {
throw new JsonPathException(e);
}
}
@Override
public String toJson(final Object obj) {
return gson.toJson(obj);
}
@Override
public Object createArray() {
return new JsonArray();
}
@Override
public Object createMap() {
return new JsonObject();
}
@Override
public boolean isArray(final Object obj) {
return (obj instanceof JsonArray || obj instanceof List);
}
@Override
public Object getArrayIndex(final Object obj, final int idx) {
return toJsonArray(obj).get(idx);
}
@Override
public void setArrayIndex(final Object array, final int index, final Object newValue) {
if (!isArray(array)) {
throw new UnsupportedOperationException();
} else {
JsonArray arr = toJsonArray(array);
if (index == arr.size()) {
arr.add(createJsonElement(newValue));
} else {
arr.set(index, createJsonElement(newValue));
}
}
}
@Override
public Object getMapValue(final Object obj, final String key) {
JsonObject jsonObject = toJsonObject(obj);
Object o = jsonObject.get(key);
if (!jsonObject.has(key)) {
return UNDEFINED;
} else {
return unwrap(o);
}
}
@Override
public void setProperty(final Object obj, final Object key, final Object value) {
if (isMap(obj)) {
toJsonObject(obj).add(key.toString(), createJsonElement(value));
} else {
JsonArray array = toJsonArray(obj);
int index;
if (key != null) {
index = key instanceof Integer ? (Integer) key : Integer.parseInt(key.toString());
} else {
index = array.size();
}
if (index == array.size()) {
array.add(createJsonElement(value));
} else {
array.set(index, createJsonElement(value));
}
}
}
@SuppressWarnings("unchecked")
public void removeProperty(final Object obj, final Object key) {
if (isMap(obj)) {
toJsonObject(obj).remove(key.toString());
} else {
JsonArray array = toJsonArray(obj);
int index = key instanceof Integer ? (Integer) key : Integer.parseInt(key.toString());
array.remove(index);
}
}
@Override
public boolean isMap(final Object obj) {
// return (obj instanceof JsonObject || obj instanceof Map);
return (obj instanceof JsonObject);
}
@Override
public Collection getPropertyKeys(final Object obj) {
List keys = new ArrayList();
for (Map.Entry entry : toJsonObject(obj).entrySet()) {
keys.add(entry.getKey());
}
return keys;
}
@Override
public int length(final Object obj) {
if (isArray(obj)) {
return toJsonArray(obj).size();
} else if (isMap(obj)) {
return toJsonObject(obj).entrySet().size();
} else {
if (obj instanceof JsonElement) {
JsonElement element = toJsonElement(obj);
if (element.isJsonPrimitive()) {
return element.toString().length();
}
}
}
throw new JsonPathException("length operation can not applied to " + (obj != null ? obj.getClass().getName()
: "null"));
}
@Override
public Iterable toIterable(final Object obj) {
JsonArray arr = toJsonArray(obj);
List