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Spring Boot Configuration Processor
/*
* Copyright 2012-2018 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 org.springframework.boot.configurationprocessor.metadata;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.springframework.boot.configurationprocessor.json.JSONArray;
import org.springframework.boot.configurationprocessor.json.JSONObject;
import org.springframework.boot.configurationprocessor.metadata.ItemMetadata.ItemType;
/**
* Marshaller to write {@link ConfigurationMetadata} as JSON.
*
* @author Stephane Nicoll
* @author Phillip Webb
* @since 1.2.0
*/
public class JsonMarshaller {
private static final int BUFFER_SIZE = 4098;
public void write(ConfigurationMetadata metadata, OutputStream outputStream)
throws IOException {
try {
JSONObject object = new JSONOrderedObject();
JsonConverter converter = new JsonConverter();
object.put("groups", converter.toJsonArray(metadata, ItemType.GROUP));
object.put("properties", converter.toJsonArray(metadata, ItemType.PROPERTY));
object.put("hints", converter.toJsonArray(metadata.getHints()));
outputStream.write(object.toString(2).getBytes(StandardCharsets.UTF_8));
}
catch (Exception ex) {
if (ex instanceof IOException) {
throw (IOException) ex;
}
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
throw new IllegalStateException(ex);
}
}
public ConfigurationMetadata read(InputStream inputStream) throws Exception {
ConfigurationMetadata metadata = new ConfigurationMetadata();
JSONObject object = new JSONObject(toString(inputStream));
JSONArray groups = object.optJSONArray("groups");
if (groups != null) {
for (int i = 0; i < groups.length(); i++) {
metadata.add(toItemMetadata((JSONObject) groups.get(i), ItemType.GROUP));
}
}
JSONArray properties = object.optJSONArray("properties");
if (properties != null) {
for (int i = 0; i < properties.length(); i++) {
metadata.add(toItemMetadata((JSONObject) properties.get(i),
ItemType.PROPERTY));
}
}
JSONArray hints = object.optJSONArray("hints");
if (hints != null) {
for (int i = 0; i < hints.length(); i++) {
metadata.add(toItemHint((JSONObject) hints.get(i)));
}
}
return metadata;
}
private ItemMetadata toItemMetadata(JSONObject object, ItemType itemType)
throws Exception {
String name = object.getString("name");
String type = object.optString("type", null);
String description = object.optString("description", null);
String sourceType = object.optString("sourceType", null);
String sourceMethod = object.optString("sourceMethod", null);
Object defaultValue = readItemValue(object.opt("defaultValue"));
ItemDeprecation deprecation = toItemDeprecation(object);
return new ItemMetadata(itemType, name, null, type, sourceType, sourceMethod,
description, defaultValue, deprecation);
}
private ItemDeprecation toItemDeprecation(JSONObject object) throws Exception {
if (object.has("deprecation")) {
JSONObject deprecationJsonObject = object.getJSONObject("deprecation");
ItemDeprecation deprecation = new ItemDeprecation();
deprecation.setLevel(deprecationJsonObject.optString("level", null));
deprecation.setReason(deprecationJsonObject.optString("reason", null));
deprecation
.setReplacement(deprecationJsonObject.optString("replacement", null));
return deprecation;
}
return (object.optBoolean("deprecated") ? new ItemDeprecation() : null);
}
private ItemHint toItemHint(JSONObject object) throws Exception {
String name = object.getString("name");
List values = new ArrayList<>();
if (object.has("values")) {
JSONArray valuesArray = object.getJSONArray("values");
for (int i = 0; i < valuesArray.length(); i++) {
values.add(toValueHint((JSONObject) valuesArray.get(i)));
}
}
List providers = new ArrayList<>();
if (object.has("providers")) {
JSONArray providersObject = object.getJSONArray("providers");
for (int i = 0; i < providersObject.length(); i++) {
providers.add(toValueProvider((JSONObject) providersObject.get(i)));
}
}
return new ItemHint(name, values, providers);
}
private ItemHint.ValueHint toValueHint(JSONObject object) throws Exception {
Object value = readItemValue(object.get("value"));
String description = object.optString("description", null);
return new ItemHint.ValueHint(value, description);
}
private ItemHint.ValueProvider toValueProvider(JSONObject object) throws Exception {
String name = object.getString("name");
Map parameters = new HashMap<>();
if (object.has("parameters")) {
JSONObject parametersObject = object.getJSONObject("parameters");
for (Iterator iterator = parametersObject.keys(); iterator.hasNext();) {
String key = (String) iterator.next();
Object value = readItemValue(parametersObject.get(key));
parameters.put(key, value);
}
}
return new ItemHint.ValueProvider(name, parameters);
}
private Object readItemValue(Object value) throws Exception {
if (value instanceof JSONArray) {
JSONArray array = (JSONArray) value;
Object[] content = new Object[array.length()];
for (int i = 0; i < array.length(); i++) {
content[i] = array.get(i);
}
return content;
}
return value;
}
private String toString(InputStream inputStream) throws IOException {
StringBuilder out = new StringBuilder();
InputStreamReader reader = new InputStreamReader(inputStream,
StandardCharsets.UTF_8);
char[] buffer = new char[BUFFER_SIZE];
int bytesRead;
while ((bytesRead = reader.read(buffer)) != -1) {
out.append(buffer, 0, bytesRead);
}
return out.toString();
}
}