/**
* Copyright 2005-2011 Noelios Technologies.
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: LGPL 3.0 or LGPL 2.1 or CDDL 1.0 or EPL 1.0 (the
* "Licenses"). You can select the license that you prefer but you may not use
* this file except in compliance with one of these Licenses.
*
* You can obtain a copy of the LGPL 3.0 license at
* http://www.opensource.org/licenses/lgpl-3.0.html
*
* You can obtain a copy of the LGPL 2.1 license at
* http://www.opensource.org/licenses/lgpl-2.1.php
*
* You can obtain a copy of the CDDL 1.0 license at
* http://www.opensource.org/licenses/cddl1.php
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://www.noelios.com/products/restlet-engine
*
* Restlet is a registered trademark of Noelios Technologies.
*/
package org.restlet.ext.json;
import java.io.IOException;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.restlet.data.MediaType;
import org.restlet.data.Preference;
import org.restlet.engine.converter.ConverterHelper;
import org.restlet.engine.resource.VariantInfo;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.representation.Variant;
import org.restlet.resource.UniformResource;
/**
* Converter between the JSON API (more precisely {@link JSONArray},
* {@link JSONObject} and {@link JSONTokener} instances) and Representation
* classes.
*
* @author Jerome Louvel
*/
public class JsonConverter extends ConverterHelper {
private static final VariantInfo VARIANT_JSON = new VariantInfo(
MediaType.APPLICATION_JSON);
@Override
public List<Class<?>> getObjectClasses(Variant source) {
List<Class<?>> result = null;
if (VARIANT_JSON.isCompatible(source)) {
result = addObjectClass(result, JSONArray.class);
result = addObjectClass(result, JSONObject.class);
result = addObjectClass(result, JSONTokener.class);
}
return result;
}
@Override
public List<VariantInfo> getVariants(Class<?> source) {
List<VariantInfo> result = null;
if (JSONArray.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_JSON);
} else if (JSONObject.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_JSON);
} else if (JSONTokener.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_JSON);
}
return result;
}
@Override
public float score(Object source, Variant target, UniformResource resource) {
float result = -1.0F;
if ((source instanceof JSONArray) || (source instanceof JSONObject)
|| (source instanceof JSONTokener)) {
if (target == null) {
result = 0.5F;
} else if (MediaType.APPLICATION_JSON.isCompatible(target
.getMediaType())) {
result = 1.0F;
} else {
result = 0.5F;
}
}
return result;
}
@Override
public <T> float score(Representation source, Class<T> target,
UniformResource resource) {
float result = -1.0F;
if (target != null) {
if (JsonRepresentation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (JSONArray.class.isAssignableFrom(target)) {
if (MediaType.APPLICATION_JSON.isCompatible(source
.getMediaType())) {
result = 1.0F;
} else {
result = 0.5F;
}
} else if (JSONObject.class.isAssignableFrom(target)) {
if (MediaType.APPLICATION_JSON.isCompatible(source
.getMediaType())) {
result = 1.0F;
} else {
result = 0.5F;
}
} else if (JSONTokener.class.isAssignableFrom(target)) {
if (MediaType.APPLICATION_JSON.isCompatible(source
.getMediaType())) {
result = 1.0F;
} else {
result = 0.5F;
}
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
public <T> T toObject(Representation source, Class<T> target,
UniformResource resource) throws IOException {
Object result = null;
if (JSONArray.class.isAssignableFrom(target)) {
try {
result = new JSONArray(source.getText());
} catch (JSONException e) {
IOException ioe = new IOException(
"Unable to convert to JSON array");
ioe.initCause(e);
}
} else if (JSONObject.class.isAssignableFrom(target)) {
try {
result = new JSONObject(source.getText());
} catch (JSONException e) {
IOException ioe = new IOException(
"Unable to convert to JSON object");
ioe.initCause(e);
}
} else if (JSONTokener.class.isAssignableFrom(target)) {
result = new JSONTokener(source.getText());
} else if (JsonRepresentation.class.isAssignableFrom(target)) {
result = new JsonRepresentation(source);
}
return (T) result;
}
@Override
public Representation toRepresentation(Object source, Variant target,
UniformResource resource) {
Representation result = null;
if (source instanceof JSONArray) {
result = new StringRepresentation(((JSONArray) source).toString());
} else if (source instanceof JSONObject) {
result = new StringRepresentation(((JSONObject) source).toString());
} else if (source instanceof JSONTokener) {
result = new StringRepresentation(((JSONTokener) source).toString());
}
return result;
}
@Override
public <T> void updatePreferences(List<Preference<MediaType>> preferences,
Class<T> entity) {
if (JSONArray.class.isAssignableFrom(entity)
|| JSONObject.class.isAssignableFrom(entity)
|| JSONTokener.class.isAssignableFrom(entity)) {
updatePreferences(preferences, MediaType.APPLICATION_JSON, 1.0F);
}
}
}