ca.uhn.fhir.parser.json.GsonStructure Maven / Gradle / Ivy
package ca.uhn.fhir.parser.json;
/*
* #%L
* HAPI FHIR - Core Library
* %%
* Copyright (C) 2014 - 2016 University Health Network
* %%
* 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.
* #L%
*/
import java.io.PushbackReader;
import java.io.Reader;
import java.io.Writer;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import ca.uhn.fhir.parser.DataFormatException;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSyntaxException;
public class GsonStructure implements JsonLikeStructure {
private enum ROOT_TYPE {OBJECT, ARRAY};
private ROOT_TYPE rootType = null;
private JsonElement nativeRoot = null;
private JsonLikeValue jsonLikeRoot = null;
private GsonWriter jsonLikeWriter = null;
public GsonStructure() {
super();
}
public GsonStructure (JsonObject json) {
super();
setNativeObject(json);
}
public GsonStructure (JsonArray json) {
super();
setNativeArray(json);
}
public void setNativeObject (JsonObject json) {
this.rootType = ROOT_TYPE.OBJECT;
this.nativeRoot = json;
}
public void setNativeArray (JsonArray json) {
this.rootType = ROOT_TYPE.ARRAY;
this.nativeRoot = json;
}
@Override
public JsonLikeStructure getInstance() {
return new GsonStructure();
}
@Override
public void load(Reader theReader) throws DataFormatException {
this.load(theReader, false);
}
@Override
public void load(Reader theReader, boolean allowArray) throws DataFormatException {
PushbackReader pbr = new PushbackReader(theReader);
int nextInt;
try {
while(true) {
nextInt = pbr.read();
if (nextInt == -1) {
throw new DataFormatException("Did not find any content to parse");
}
if (nextInt == '{') {
pbr.unread(nextInt);
break;
}
if (Character.isWhitespace(nextInt)) {
continue;
}
if (allowArray) {
if (nextInt == '[') {
pbr.unread(nextInt);
break;
}
throw new DataFormatException("Content does not appear to be FHIR JSON, first non-whitespace character was: '" + (char)nextInt + "' (must be '{' or '[')");
}
throw new DataFormatException("Content does not appear to be FHIR JSON, first non-whitespace character was: '" + (char)nextInt + "' (must be '{')");
}
Gson gson = new GsonBuilder().disableHtmlEscaping().create();
if (nextInt == '{') {
JsonObject root = gson.fromJson(pbr, JsonObject.class);
setNativeObject(root);
} else
if (nextInt == '[') {
JsonArray root = gson.fromJson(pbr, JsonArray.class);
setNativeArray(root);
}
} catch (JsonSyntaxException e) {
if (e.getMessage().startsWith("Unexpected char 39")) {
throw new DataFormatException("Failed to parse JSON encoded FHIR content: " + e.getMessage() + " - This may indicate that single quotes are being used as JSON escapes where double quotes are required", e);
}
throw new DataFormatException("Failed to parse JSON encoded FHIR content: " + e.getMessage(), e);
} catch (Exception e) {
throw new DataFormatException("Failed to parse JSON content, error was: " + e.getMessage(), e);
}
}
@Override
public JsonLikeWriter getJsonLikeWriter (Writer writer) {
if (null == jsonLikeWriter) {
jsonLikeWriter = new GsonWriter(writer);
}
return jsonLikeWriter;
}
@Override
public JsonLikeWriter getJsonLikeWriter () {
if (null == jsonLikeWriter) {
jsonLikeWriter = new GsonWriter();
}
return jsonLikeWriter;
}
@Override
public JsonLikeObject getRootObject() throws DataFormatException {
if (rootType == ROOT_TYPE.OBJECT) {
if (null == jsonLikeRoot) {
jsonLikeRoot = new GsonJsonObject((JsonObject)nativeRoot);
}
return jsonLikeRoot.getAsObject();
}
throw new DataFormatException("Content must be a valid JSON Object. It must start with '{'.");
}
@Override
public JsonLikeArray getRootArray() throws DataFormatException {
if (rootType == ROOT_TYPE.ARRAY) {
if (null == jsonLikeRoot) {
jsonLikeRoot = new GsonJsonArray((JsonArray)nativeRoot);
}
return jsonLikeRoot.getAsArray();
}
throw new DataFormatException("Content must be a valid JSON Array. It must start with '['.");
}
private static class GsonJsonObject extends JsonLikeObject {
private JsonObject nativeObject;
private Set keySet = null;
private Map jsonLikeMap = new LinkedHashMap();
public GsonJsonObject (JsonObject json) {
this.nativeObject = json;
}
@Override
public Object getValue() {
return null;
}
@Override
public Set keySet() {
if (null == keySet) {
Set> entrySet = nativeObject.entrySet();
keySet = new EntryOrderedSet(entrySet.size());
for (Entry entry : entrySet) {
keySet.add(entry.getKey());
}
}
return keySet;
}
@Override
public JsonLikeValue get(String key) {
JsonLikeValue result = null;
if (jsonLikeMap.containsKey(key)) {
result = jsonLikeMap.get(key);
} else {
JsonElement child = nativeObject.get(key);
if (child != null) {
result = new GsonJsonValue(child);
}
jsonLikeMap.put(key, result);
}
return result;
}
}
private static class GsonJsonArray extends JsonLikeArray {
private JsonArray nativeArray;
private Map jsonLikeMap = new LinkedHashMap();
public GsonJsonArray (JsonArray json) {
this.nativeArray = json;
}
@Override
public Object getValue() {
return null;
}
@Override
public int size() {
return nativeArray.size();
}
@Override
public JsonLikeValue get(int index) {
Integer key = Integer.valueOf(index);
JsonLikeValue result = null;
if (jsonLikeMap.containsKey(key)) {
result = jsonLikeMap.get(key);
} else {
JsonElement child = nativeArray.get(index);
if (child != null) {
result = new GsonJsonValue(child);
}
jsonLikeMap.put(key, result);
}
return result;
}
}
private static class GsonJsonValue extends JsonLikeValue {
private JsonElement nativeValue;
private JsonLikeObject jsonLikeObject = null;
private JsonLikeArray jsonLikeArray = null;
public GsonJsonValue (JsonElement json) {
this.nativeValue = json;
}
@Override
public Object getValue() {
if (nativeValue != null && nativeValue.isJsonPrimitive()) {
if (((JsonPrimitive)nativeValue).isNumber()) {
return nativeValue.getAsNumber();
}
if (((JsonPrimitive)nativeValue).isBoolean()) {
return Boolean.valueOf(nativeValue.getAsBoolean());
}
return nativeValue.getAsString();
}
return null;
}
@Override
public ValueType getJsonType() {
if (null == nativeValue || nativeValue.isJsonNull()) {
return ValueType.NULL;
}
if (nativeValue.isJsonObject()) {
return ValueType.OBJECT;
}
if (nativeValue.isJsonArray()) {
return ValueType.ARRAY;
}
if (nativeValue.isJsonPrimitive()) {
return ValueType.SCALAR;
}
return null;
}
@Override
public ScalarType getDataType() {
if (nativeValue != null && nativeValue.isJsonPrimitive()) {
if (((JsonPrimitive)nativeValue).isNumber()) {
return ScalarType.NUMBER;
}
if (((JsonPrimitive)nativeValue).isString()) {
return ScalarType.STRING;
}
if (((JsonPrimitive)nativeValue).isBoolean()) {
return ScalarType.BOOLEAN;
}
}
return null;
}
@Override
public JsonLikeArray getAsArray() {
if (nativeValue != null && nativeValue.isJsonArray()) {
if (null == jsonLikeArray) {
jsonLikeArray = new GsonJsonArray((JsonArray)nativeValue);
}
}
return jsonLikeArray;
}
@Override
public JsonLikeObject getAsObject() {
if (nativeValue != null && nativeValue.isJsonObject()) {
if (null == jsonLikeObject) {
jsonLikeObject = new GsonJsonObject((JsonObject)nativeValue);
}
}
return jsonLikeObject;
}
@Override
public Number getAsNumber() {
return nativeValue != null ? nativeValue.getAsNumber() : null;
}
@Override
public String getAsString() {
return nativeValue != null ? nativeValue.getAsString() : null;
}
@Override
public boolean getAsBoolean() {
if (nativeValue != null && nativeValue.isJsonPrimitive() && ((JsonPrimitive)nativeValue).isBoolean()) {
return nativeValue.getAsBoolean();
}
return super.getAsBoolean();
}
}
private static class EntryOrderedSet extends AbstractSet {
private transient ArrayList data = null;
public EntryOrderedSet (int initialCapacity) {
data = new ArrayList(initialCapacity);
}
@SuppressWarnings("unused")
public EntryOrderedSet () {
data = new ArrayList();
}
@Override
public int size() {
return data.size();
}
@Override
public boolean contains(Object o) {
return data.contains(o);
}
@SuppressWarnings("unused") // not really.. just not here
public T get(int index) {
return data.get(index);
}
@Override
public boolean add(T element) {
if (data.contains(element)) {
return false;
}
return data.add(element);
}
@Override
public boolean remove(Object o) {
return data.remove(o);
}
@Override
public void clear() {
data.clear();
}
@Override
public Iterator iterator() {
return data.iterator();
}
}
}
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