/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.isis.viewer.restfulobjects.rendering.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.google.common.base.Charsets;
import com.google.common.io.ByteStreams;
import org.apache.isis.viewer.restfulobjects.applib.JsonRepresentation;
import org.apache.isis.viewer.restfulobjects.applib.client.RestfulResponse;
import org.apache.isis.viewer.restfulobjects.applib.util.JsonMapper;
import org.apache.isis.viewer.restfulobjects.rendering.RestfulObjectsApplicationException;
public final class Util {
private Util(){}
// //////////////////////////////////////////////////////////////
// parsing
// //////////////////////////////////////////////////////////////
/**
* Parse {@link java.io.InputStream} to String, else throw exception
*/
public static String asStringUtf8(final InputStream body) {
try {
final byte[] byteArray = ByteStreams.toByteArray(body);
return new String(byteArray, Charsets.UTF_8);
} catch (final IOException e) {
throw RestfulObjectsApplicationException.createWithCauseAndMessage(RestfulResponse.HttpStatusCode.BAD_REQUEST, e, "could not read body");
}
}
/**
* Parse (body) string to {@link org.apache.isis.viewer.restfulobjects.applib.JsonRepresentation}, else throw exception
*/
public static JsonRepresentation readAsMap(final String body) {
if (body == null) {
return JsonRepresentation.newMap();
}
final String bodyTrimmed = body.trim();
if (bodyTrimmed.isEmpty()) {
return JsonRepresentation.newMap();
}
return read(bodyTrimmed, "body");
}
/**
* Parse (query) string to {@link org.apache.isis.viewer.restfulobjects.applib.JsonRepresentation}, else throw exception
*/
public static JsonRepresentation readQueryStringAsMap(final String queryString) {
if (queryString == null) {
return JsonRepresentation.newMap();
}
final String queryStringTrimmed = queryString.trim();
if (queryStringTrimmed.isEmpty()) {
return JsonRepresentation.newMap();
}
return read(queryStringTrimmed, "query string");
}
/**
* REVIEW - looks similar to above methods, but now unused; can it be deleted?
*/
public static JsonRepresentation readParameterMapAsMap(final Map<String, String[]> parameterMap) {
final JsonRepresentation map = JsonRepresentation.newMap();
for (final Map.Entry<String, String[]> parameter : parameterMap.entrySet()) {
map.mapPut(parameter.getKey(), parameter.getValue()[0]);
}
return map;
}
private static JsonRepresentation read(final String args, final String argsNature) {
try {
final JsonRepresentation jsonRepr = JsonMapper.instance().read(args);
if (!jsonRepr.isMap()) {
throw RestfulObjectsApplicationException.createWithMessage(RestfulResponse.HttpStatusCode.BAD_REQUEST, "could not read %s as a JSON map", argsNature);
}
return jsonRepr;
} catch (final JsonParseException e) {
throw RestfulObjectsApplicationException.createWithCauseAndMessage(RestfulResponse.HttpStatusCode.BAD_REQUEST, e, "could not parse %s", argsNature);
} catch (final JsonMappingException e) {
throw RestfulObjectsApplicationException.createWithCauseAndMessage(RestfulResponse.HttpStatusCode.BAD_REQUEST, e, "could not read %s as JSON", argsNature);
} catch (final IOException e) {
throw RestfulObjectsApplicationException.createWithCauseAndMessage(RestfulResponse.HttpStatusCode.BAD_REQUEST, e, "could not parse %s", argsNature);
}
}
}