org.jboss.resteasy.plugins.providers.ProviderHelper Maven / Gradle / Ivy
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.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
/**
* A utility class to provide supporting functionality to various
* entity providers.
*
* @author Ryan J. McDonough
* @version $Revision: $
*/
public final class ProviderHelper
{
private ProviderHelper()
{
}
/**
* @param in input stream
* @return string data
* @throws IOException if I/O error occurred
*/
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 input stream
* @param mediaType media type
* @return string data
* @throws IOException if I/O error occurred
*/
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, StandardCharsets.UTF_8);
}
/**
* @param mediaTypes string array of media types
* @return list of media types
*/
public static List getAvailableMediaTypes(String[] mediaTypes)
{
List types = new ArrayList();
for (String mediaType : mediaTypes)
{
types.add(MediaType.valueOf(mediaType));
}
return types;
}
/**
* @param mediaTypes string array of media types
* @return list of {@link Variant}
*/
public static List getAvailableVariants(String[] mediaTypes)
{
return getAvailableVariants(getAvailableMediaTypes(mediaTypes));
}
/**
* @param mediaTypes list of media types
* @return list of {@link Variant}
*/
public static List getAvailableVariants(List mediaTypes)
{
VariantListBuilder builder = Variant.VariantListBuilder.newInstance();
MediaType[] types = mediaTypes.toArray(new MediaType[mediaTypes.size()]);
builder.mediaTypes(types);
return builder.build();
}
/**
* @param in input stream
* @param out output stream
* @throws IOException if I/O error occurred
*/
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);
}
}
}