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/*
* Copyright (c) 2014 Red Hat, Inc. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.aaa.idpmapping;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.json.Json;
import javax.json.JsonValue;
import javax.json.stream.JsonGenerator;
import javax.json.stream.JsonGeneratorFactory;
import javax.json.stream.JsonLocation;
import javax.json.stream.JsonParser;
import javax.json.stream.JsonParser.Event;
/**
* Converts between JSON and the internal data structures used in the
* RuleProcessor.
*
* @author John Dennis <jdennis@redhat.com>
*/
public class IdpJson {
public IdpJson() {
}
public Object loadJson(java.io.Reader in) {
JsonParser parser = Json.createParser(in);
Event event = null;
// Prime the pump. Get the first item from the parser.
event = parser.next();
// Act on first item.
return loadJsonItem(parser, event);
}
public Object loadJson(Path filename) throws IOException {
BufferedReader reader = Files.newBufferedReader(filename, StandardCharsets.UTF_8);
return loadJson(reader);
}
public Object loadJson(String string) {
StringReader reader = new StringReader(string);
return loadJson(reader);
}
/*
* Process current parser item indicated by event. Consumes exactly the
* number of parser events necessary to load the item. Caller must advance
* the parser via parser.next() after this method returns.
*/
private Object loadJsonItem(JsonParser parser, Event event) {
switch (event) {
case START_OBJECT: {
return loadJsonObject(parser, event);
}
case START_ARRAY: {
return loadJsonArray(parser, event);
}
case VALUE_NULL: {
return null;
}
case VALUE_NUMBER: {
if (parser.isIntegralNumber()) {
return parser.getLong();
} else {
return parser.getBigDecimal().doubleValue();
}
}
case VALUE_STRING: {
return parser.getString();
}
case VALUE_TRUE: {
return Boolean.TRUE;
}
case VALUE_FALSE: {
return Boolean.FALSE;
}
default: {
JsonLocation location = parser.getLocation();
throw new IllegalStateException(String.format(
"unknown JSON parsing event %s, location(line=%d column=%d offset=%d)", event,
location.getLineNumber(), location.getColumnNumber(),
location.getStreamOffset()));
}
}
}
private List<Object> loadJsonArray(JsonParser parser, Event event) {
List<Object> list = new ArrayList<Object>();
if (event != Event.START_ARRAY) {
JsonLocation location = parser.getLocation();
throw new IllegalStateException(
String.format(
"expected JSON parsing event to be START_ARRAY, not %s location(line=%d column=%d offset=%d)",
event, location.getLineNumber(), location.getColumnNumber(),
location.getStreamOffset()));
}
event = parser.next(); // consume START_ARRAY
while (event != Event.END_ARRAY) {
Object obj;
obj = loadJsonItem(parser, event);
list.add(obj);
event = parser.next(); // next array item or END_ARRAY
}
return list;
}
private Map<String, Object> loadJsonObject(JsonParser parser, Event event) {
Map<String, Object> map = new LinkedHashMap<String, Object>();
if (event != Event.START_OBJECT) {
JsonLocation location = parser.getLocation();
throw new IllegalStateException(String.format(
"expected JSON parsing event to be START_OBJECT, not %s, ",
"location(line=%d column=%d offset=%d)", event, location.getLineNumber(),
location.getColumnNumber(), location.getStreamOffset()));
}
event = parser.next(); // consume START_OBJECT
while (event != Event.END_OBJECT) {
if (event == Event.KEY_NAME) {
String key;
Object value;
key = parser.getString();
event = parser.next(); // consume key
value = loadJsonItem(parser, event);
map.put(key, value);
} else {
JsonLocation location = parser.getLocation();
throw new IllegalStateException(
String.format(
"expected JSON parsing event to be KEY_NAME, not %s, location(line=%d column=%d offset=%d)",
event, location.getLineNumber(), location.getColumnNumber(),
location.getStreamOffset()));
}
event = parser.next(); // next key or END_OBJECT
}
return map;
}
public String dumpJson(Object obj) {
Map<String, Object> properties = new HashMap<String, Object>(1);
properties.put(JsonGenerator.PRETTY_PRINTING, true);
JsonGeneratorFactory generatorFactory = Json.createGeneratorFactory(properties);
StringWriter stringWriter = new StringWriter();
JsonGenerator generator = generatorFactory.createGenerator(stringWriter);
dumpJsonItem(generator, obj);
generator.close();
return stringWriter.toString();
}
private void dumpJsonItem(JsonGenerator generator, Object obj) {
// ordered by expected occurrence
if (obj instanceof String) {
generator.write((String) obj);
} else if (obj instanceof List) {
generator.writeStartArray();
@SuppressWarnings("unchecked")
List<Object> list = (List<Object>) obj;
dumpJsonArray(generator, list);
} else if (obj instanceof Map) {
generator.writeStartObject();
@SuppressWarnings("unchecked")
Map<String, Object> map = (Map<String, Object>) obj;
dumpJsonObject(generator, map);
} else if (obj instanceof Long) {
generator.write(((Long) obj).longValue());
} else if (obj instanceof Boolean) {
generator.write(((Boolean) obj).booleanValue());
} else if (obj == null) {
generator.writeNull();
} else if (obj instanceof Double) {
generator.write(((Double) obj).doubleValue());
} else {
throw new IllegalStateException(
String.format(
"unsupported data type, must be String, Long, Double, Boolean, List, Map, or null, not %s",
obj.getClass().getSimpleName()));
}
}
private void dumpJsonArray(JsonGenerator generator, List<Object> list) {
for (Object obj : list) {
dumpJsonItem(generator, obj);
}
generator.writeEnd();
}
private void dumpJsonObject(JsonGenerator generator, Map<String, Object> map) {
for (Map.Entry<String, Object> entry : map.entrySet()) {
String key = entry.getKey();
Object obj = entry.getValue();
// ordered by expected occurrence
if (obj instanceof String) {
generator.write(key, (String) obj);
} else if (obj instanceof List) {
generator.writeStartArray(key);
@SuppressWarnings("unchecked")
List<Object> list = (List<Object>) obj;
dumpJsonArray(generator, list);
} else if (obj instanceof Map) {
generator.writeStartObject(key);
@SuppressWarnings("unchecked")
Map<String, Object> map1 = (Map<String, Object>) obj;
dumpJsonObject(generator, map1);
} else if (obj instanceof Long) {
generator.write(key, ((Long) obj).longValue());
} else if (obj instanceof Boolean) {
generator.write(key, ((Boolean) obj).booleanValue());
} else if (obj == null) {
generator.write(key, JsonValue.NULL);
} else if (obj instanceof Double) {
generator.write(key, ((Double) obj).doubleValue());
} else {
throw new IllegalStateException(
String.format(
"unsupported data type, must be String, Long, Double, Boolean, List, Map, or null, not %s",
obj.getClass().getSimpleName()));
}
}
generator.writeEnd();
}
}
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