/**
* 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.engine.converter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.Serializable;
import java.nio.channels.ReadableByteChannel;
import java.util.List;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Preference;
import org.restlet.engine.resource.VariantInfo;
import org.restlet.representation.EmptyRepresentation;
import org.restlet.representation.FileRepresentation;
import org.restlet.representation.InputRepresentation;
import org.restlet.representation.ObjectRepresentation;
import org.restlet.representation.ReaderRepresentation;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.representation.Variant;
import org.restlet.resource.UniformResource;
/**
* Converter for the built-in Representation classes.
*
* @author Jerome Louvel
*/
public class DefaultConverter extends ConverterHelper {
/** Neutral variant. */
private static final VariantInfo VARIANT_ALL = new VariantInfo(
MediaType.ALL);
/** Web form variant. */
private static final VariantInfo VARIANT_FORM = new VariantInfo(
MediaType.APPLICATION_WWW_FORM);
/** Octet stream variant. */
private static final VariantInfo VARIANT_OBJECT = new VariantInfo(
MediaType.APPLICATION_JAVA_OBJECT);
/** Octet stream variant. */
private static final VariantInfo VARIANT_OBJECT_XML = new VariantInfo(
MediaType.APPLICATION_JAVA_OBJECT_XML);
@Override
public List<Class<?>> getObjectClasses(Variant source) {
List<Class<?>> result = null;
result = addObjectClass(result, String.class);
result = addObjectClass(result, InputStream.class);
result = addObjectClass(result, Reader.class);
result = addObjectClass(result, ReadableByteChannel.class);
if (source.getMediaType() != null) {
MediaType mediaType = source.getMediaType();
if (MediaType.APPLICATION_JAVA_OBJECT.equals(mediaType)
|| MediaType.APPLICATION_JAVA_OBJECT_XML.equals(mediaType)) {
result = addObjectClass(result, Object.class);
} else if (MediaType.APPLICATION_WWW_FORM.equals(mediaType)) {
result = addObjectClass(result, Form.class);
}
}
return result;
}
@Override
public List<VariantInfo> getVariants(Class<?> source) {
List<VariantInfo> result = null;
if (String.class.isAssignableFrom(source)
|| StringRepresentation.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_ALL);
} else if (File.class.isAssignableFrom(source)
|| FileRepresentation.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_ALL);
} else if (InputStream.class.isAssignableFrom(source)
|| InputRepresentation.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_ALL);
} else if (Reader.class.isAssignableFrom(source)
|| ReaderRepresentation.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_ALL);
} else if (Representation.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_ALL);
} else if (Form.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_FORM);
} else if (Serializable.class.isAssignableFrom(source)) {
result = addVariant(result, VARIANT_OBJECT);
result = addVariant(result, VARIANT_OBJECT_XML);
}
return result;
}
@Override
public float score(Object source, Variant target, UniformResource resource) {
float result = -1.0F;
if (source instanceof String) {
result = 1.0F;
} else if (source instanceof File) {
result = 1.0F;
} else if (source instanceof Form) {
if ((target != null)
&& MediaType.APPLICATION_WWW_FORM.isCompatible(target
.getMediaType())) {
result = 1.0F;
} else {
result = 0.6F;
}
} else if (source instanceof InputStream) {
result = 1.0F;
} else if (source instanceof Reader) {
result = 1.0F;
} else if (source instanceof Representation) {
result = 1.0F;
} else if (source instanceof Serializable) {
if (target != null) {
if (MediaType.APPLICATION_JAVA_OBJECT.equals(target
.getMediaType())) {
result = 1.0F;
} else if (MediaType.APPLICATION_JAVA_OBJECT
.isCompatible(target.getMediaType())) {
result = 0.6F;
} else if (MediaType.APPLICATION_JAVA_OBJECT_XML.equals(target
.getMediaType())) {
result = 1.0F;
} else if (MediaType.APPLICATION_JAVA_OBJECT_XML
.isCompatible(target.getMediaType())) {
result = 0.6F;
}
} 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 (Representation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (String.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (StringRepresentation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (EmptyRepresentation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (File.class.isAssignableFrom(target)) {
if (source instanceof FileRepresentation) {
result = 1.0F;
}
} else if (Form.class.isAssignableFrom(target)) {
if (MediaType.APPLICATION_WWW_FORM.isCompatible(source
.getMediaType())) {
result = 1.0F;
} else {
result = 0.5F;
}
} else if (InputStream.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (InputRepresentation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (Reader.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (ReaderRepresentation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (Serializable.class.isAssignableFrom(target)) {
if (MediaType.APPLICATION_JAVA_OBJECT.equals(source
.getMediaType())) {
result = 1.0F;
} else if (MediaType.APPLICATION_JAVA_OBJECT
.isCompatible(source.getMediaType())) {
result = 0.6F;
} else if (MediaType.APPLICATION_JAVA_OBJECT_XML.equals(source
.getMediaType())) {
result = 1.0F;
} else if (MediaType.APPLICATION_JAVA_OBJECT_XML
.isCompatible(source.getMediaType())) {
result = 0.6F;
} else {
result = 0.5F;
}
}
} else if (source instanceof ObjectRepresentation<?>) {
result = 1.0F;
}
return result;
}
@SuppressWarnings("unchecked")
@Override
public <T> T toObject(Representation source, Class<T> target,
UniformResource resource) throws IOException {
Object result = null;
if (target != null) {
if (target.isAssignableFrom(source.getClass())) {
result = source;
} else if (String.class.isAssignableFrom(target)) {
result = source.getText();
} else if (StringRepresentation.class.isAssignableFrom(target)) {
result = new StringRepresentation(source.getText(),
source.getMediaType());
} else if (EmptyRepresentation.class.isAssignableFrom(target)) {
result = null;
} else if (File.class.isAssignableFrom(target)) {
if (source instanceof FileRepresentation) {
result = ((FileRepresentation) source).getFile();
} else {
result = null;
}
} else if (Form.class.isAssignableFrom(target)) {
result = new Form(source);
} else if (InputStream.class.isAssignableFrom(target)) {
result = source.getStream();
} else if (InputRepresentation.class.isAssignableFrom(target)) {
result = new InputRepresentation(source.getStream());
} else if (Reader.class.isAssignableFrom(target)) {
result = source.getReader();
} else if (ReaderRepresentation.class.isAssignableFrom(target)) {
result = new ReaderRepresentation(source.getReader());
} else if (Serializable.class.isAssignableFrom(target)
|| (target == null)) {
if (source instanceof ObjectRepresentation<?>) {
result = ((ObjectRepresentation<?>) source).getObject();
} else {
try {
result = new ObjectRepresentation<Serializable>(source)
.getObject();
} catch (Exception e) {
IOException ioe = new IOException(
"Unable to create the Object representation");
ioe.initCause(e);
result = null;
}
}
}
} else if (source instanceof ObjectRepresentation<?>) {
result = ((ObjectRepresentation<?>) source).getObject();
}
return (T) result;
}
@Override
public Representation toRepresentation(Object source, Variant target,
UniformResource resource) throws IOException {
Representation result = null;
if (source instanceof String) {
result = new StringRepresentation((String) source,
MediaType.getMostSpecific(target.getMediaType(),
MediaType.TEXT_PLAIN));
} else if (source instanceof File) {
result = new FileRepresentation((File) source,
MediaType.getMostSpecific(target.getMediaType(),
MediaType.APPLICATION_OCTET_STREAM));
} else if (source instanceof Form) {
result = ((Form) source).getWebRepresentation();
} else if (source instanceof InputStream) {
result = new InputRepresentation((InputStream) source,
MediaType.getMostSpecific(target.getMediaType(),
MediaType.APPLICATION_OCTET_STREAM));
} else if (source instanceof Reader) {
result = new ReaderRepresentation((Reader) source,
MediaType.getMostSpecific(target.getMediaType(),
MediaType.TEXT_PLAIN));
} else if (source instanceof Representation) {
result = (Representation) source;
} else if (source instanceof Serializable) {
result = new ObjectRepresentation<Serializable>(
(Serializable) source, MediaType.getMostSpecific(
target.getMediaType(),
MediaType.APPLICATION_OCTET_STREAM));
}
return result;
}
@Override
public <T> void updatePreferences(List<Preference<MediaType>> preferences,
Class<T> entity) {
if (Form.class.isAssignableFrom(entity)) {
updatePreferences(preferences, MediaType.APPLICATION_WWW_FORM, 1.0F);
} else if (Serializable.class.isAssignableFrom(entity)) {
updatePreferences(preferences, MediaType.APPLICATION_JAVA_OBJECT,
1.0F);
updatePreferences(preferences,
MediaType.APPLICATION_JAVA_OBJECT_XML, 1.0F);
} else if (String.class.isAssignableFrom(entity)
|| Reader.class.isAssignableFrom(entity)) {
updatePreferences(preferences, MediaType.TEXT_PLAIN, 1.0F);
updatePreferences(preferences, MediaType.TEXT_ALL, 0.5F);
} else if (InputStream.class.isAssignableFrom(entity)
|| ReadableByteChannel.class.isAssignableFrom(entity)) {
updatePreferences(preferences, MediaType.APPLICATION_OCTET_STREAM,
1.0F);
updatePreferences(preferences, MediaType.APPLICATION_ALL, 0.5F);
}
}
}