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package javax.json.spi;
import javax.json.*;
import javax.json.stream.JsonGenerator;
import javax.json.stream.JsonGeneratorFactory;
import javax.json.stream.JsonParser;
import javax.json.stream.JsonParserFactory;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.util.Iterator;
import java.util.Map;
import java.util.ServiceLoader;
/**
* Service provider for JSON processing objects.
*
* <p>All the methods in this class are safe for use by multiple concurrent
* threads.
*
* @see ServiceLoader
* @author Jitendra Kotamraju
*/
public abstract class JsonProvider {
/**
* A constant representing the name of the default
* {@code JsonProvider} implementation class.
*/
private static final String DEFAULT_PROVIDER
= "org.glassfish.json.JsonProviderImpl";
protected JsonProvider() {
}
/**
*
* Creates a JSON provider object. The provider is loaded using the
* {@link ServiceLoader#load(Class)} method. If there are no available
* service providers, this method returns the default service provider.
*
* @see ServiceLoader
* @return a JSON provider
*/
public static JsonProvider provider() {
ServiceLoader<JsonProvider> loader = ServiceLoader.load(JsonProvider.class);
Iterator<JsonProvider> it = loader.iterator();
if (it.hasNext()) {
return it.next();
}
try {
Class<?> clazz = Class.forName(DEFAULT_PROVIDER);
return (JsonProvider)clazz.newInstance();
} catch (ClassNotFoundException x) {
throw new JsonException(
"Provider " + DEFAULT_PROVIDER + " not found", x);
} catch (Exception x) {
throw new JsonException(
"Provider " + DEFAULT_PROVIDER + " could not be instantiated: " + x,
x);
}
}
/**
* Creates a JSON parser from a character stream.
*
* @param reader i/o reader from which JSON is to be read
* @return a JSON parser
*/
public abstract JsonParser createParser(Reader reader);
/**
* Creates a JSON parser from the specified byte stream.
* The character encoding of the stream is determined
* as defined in <a href="http://tools.ietf.org/rfc/rfc4627.txt">RFC 4627
* </a>.
*
* @param in i/o stream from which JSON is to be read
* @throws JsonException if encoding cannot be determined
* or i/o error (IOException would be cause of JsonException)
* @return a JSON parser
*/
public abstract JsonParser createParser(InputStream in);
/**
* Creates a parser factory for creating {@link JsonParser} instances.
*
* @return a JSON parser factory
*
public abstract JsonParserFactory createParserFactory();
*/
/**
* Creates a parser factory for creating {@link JsonParser} instances.
* The factory is configured with the specified map of
* provider specific configuration properties. Provider implementations
* should ignore any unsupported configuration properties specified in
* the map.
*
* @param config a map of provider specific properties to configure the
* JSON parsers. The map may be empty or null
* @return a JSON parser factory
*/
public abstract JsonParserFactory createParserFactory(Map<String, ?> config);
/**
* Creates a JSON generator for writing JSON text to a character stream.
*
* @param writer a i/o writer to which JSON is written
* @return a JSON generator
*/
public abstract JsonGenerator createGenerator(Writer writer);
/**
* Creates a JSON generator for writing JSON text to a byte stream.
*
* @param out i/o stream to which JSON is written
* @return a JSON generator
*/
public abstract JsonGenerator createGenerator(OutputStream out);
/**
* Creates a generator factory for creating {@link JsonGenerator} instances.
*
* @return a JSON generator factory
*
public abstract JsonGeneratorFactory createGeneratorFactory();
*/
/**
* Creates a generator factory for creating {@link JsonGenerator} instances.
* The factory is configured with the specified map of provider specific
* configuration properties. Provider implementations should
* ignore any unsupported configuration properties specified in the map.
*
* @param config a map of provider specific properties to configure the
* JSON generators. The map may be empty or null
* @return a JSON generator factory
*/
public abstract JsonGeneratorFactory createGeneratorFactory(Map<String, ?> config);
/**
* Creates a JSON reader from a character stream.
*
* @param reader a reader from which JSON is to be read
* @return a JSON reader
*/
public abstract JsonReader createReader(Reader reader);
/**
* Creates a JSON reader from a byte stream. The character encoding of
* the stream is determined as described in
* <a href="http://tools.ietf.org/rfc/rfc4627.txt">RFC 4627</a>.
*
* @param in a byte stream from which JSON is to be read
* @return a JSON reader
*/
public abstract JsonReader createReader(InputStream in);
/**
* Creates a JSON writer to write a
* JSON {@link JsonObject object} or {@link JsonArray array}
* structure to the specified character stream.
*
* @param writer to which JSON object or array is written
* @return a JSON writer
*/
public abstract JsonWriter createWriter(Writer writer);
/**
* Creates a JSON writer to write a
* JSON {@link JsonObject object} or {@link JsonArray array}
* structure to the specified byte stream. Characters written to
* the stream are encoded into bytes using UTF-8 encoding.
*
* @param out to which JSON object or array is written
* @return a JSON writer
*/
public abstract JsonWriter createWriter(OutputStream out);
/**
* Creates a writer factory for creating {@link JsonWriter} objects.
* The factory is configured with the specified map of provider specific
* configuration properties. Provider implementations should ignore any
* unsupported configuration properties specified in the map.
*
* @param config a map of provider specific properties to configure the
* JSON writers. The map may be empty or null
* @return a JSON writer factory
*/
public abstract JsonWriterFactory createWriterFactory(Map<String,?> config);
/**
* Creates a reader factory for creating {@link JsonReader} objects.
* The factory is configured with the specified map of provider specific
* configuration properties. Provider implementations should ignore any
* unsupported configuration properties specified in the map.
*
* @param config a map of provider specific properties to configure the
* JSON readers. The map may be empty or null
* @return a JSON reader factory
*/
public abstract JsonReaderFactory createReaderFactory(Map<String,?> config);
/**
* Creates a JSON object builder
*
* @return a JSON object builder
*/
public abstract JsonObjectBuilder createObjectBuilder();
/**
* Creates a JSON array builder
*
* @return a JSON array builder
*/
public abstract JsonArrayBuilder createArrayBuilder();
/**
* Creates a builder factory for creating {@link JsonArrayBuilder}
* and {@link JsonObjectBuilder} objects.
* The factory is configured with the specified map of provider specific
* configuration properties. Provider implementations should ignore any
* unsupported configuration properties specified in the map.
*
* @param config a map of provider specific properties to configure the
* JSON builders. The map may be empty or null
* @return a JSON builder factory
*/
public abstract JsonBuilderFactory createBuilderFactory(Map<String,?> config);
}