/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.resteasy.plugins.providers;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Variant;
import javax.ws.rs.core.Variant.VariantListBuilder;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* A utility class to provide supporting functionality to various
* entity providers.
*
* @author <a href="ryan@damnhandy.com>Ryan J. McDonough</a>
* @version $Revision: $
*/
public final class ProviderHelper
{
private ProviderHelper()
{
}
/**
* @param in
* @return
* @throws IOException
*/
public static String readString(InputStream in) throws IOException
{
char[] buffer = new char[1024];
StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
int wasRead = 0;
do
{
wasRead = reader.read(buffer, 0, 1024);
if (wasRead > 0)
{
builder.append(buffer, 0, wasRead);
}
}
while (wasRead > -1);
return builder.toString();
}
/**
* @param in
* @return
* @throws IOException
*/
public static String readString(InputStream in, MediaType mediaType) throws IOException
{
byte[] buffer = new byte[1024];
ByteArrayOutputStream builder = new ByteArrayOutputStream();
int wasRead = 0;
do
{
wasRead = in.read(buffer, 0, 1024);
if (wasRead > 0)
{
builder.write(buffer, 0, wasRead);
}
}
while (wasRead > -1);
byte[] bytes = builder.toByteArray();
String charset = mediaType.getParameters().get("charset");
if (charset != null) return new String(bytes, charset);
else return new String(bytes, "UTF-8");
}
/**
* @param mediaTypes
* @return
*/
public static List<MediaType> getAvailableMediaTypes(String[] mediaTypes)
{
List<MediaType> types = new ArrayList<MediaType>();
for (String mediaType : mediaTypes)
{
types.add(MediaType.valueOf(mediaType));
}
return types;
}
/**
* @param mediaTypes
* @return
*/
public static List<Variant> getAvailableVariants(String[] mediaTypes)
{
return getAvailableVariants(getAvailableMediaTypes(mediaTypes));
}
/**
* @param mediaTypes
* @return
*/
public static List<Variant> getAvailableVariants(List<MediaType> mediaTypes)
{
VariantListBuilder builder = Variant.VariantListBuilder.newInstance();
MediaType[] types = mediaTypes.toArray(new MediaType[mediaTypes.size()]);
builder.mediaTypes(types);
return builder.build();
}
/**
* @param in
* @param out
* @throws IOException
*/
public static void writeTo(final InputStream in, final OutputStream out) throws IOException
{
int read;
final byte[] buf = new byte[2048];
while ((read = in.read(buf)) != -1)
{
out.write(buf, 0, read);
}
}
}