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package org.glassfish.jersey.server.internal.inject;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.text.ParseException;
import java.util.Date;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.ext.ParamConverter;
import javax.ws.rs.ext.ParamConverterProvider;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.util.ReflectionHelper;
import org.glassfish.jersey.message.internal.HttpDateFormat;
import org.glassfish.hk2.api.ServiceLocator;
/**
* Container of several different {@link ParamConverterProvider param converter providers}
* implementations. The nested provider implementations encapsulate various different
* strategies of constructing an instance from a {@code String} value.
*
* @author Paul Sandoz
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@Singleton
class ParamConverters {
private static abstract class AbstractStringReader implements ParamConverter {
@Override
public T fromString(final String value) {
try {
return _fromString(value);
} catch (final InvocationTargetException ex) {
// if the value is an empty string, return null
if (value.isEmpty()) {
return null;
}
final Throwable cause = ex.getCause();
if (cause instanceof WebApplicationException) {
throw (WebApplicationException) cause;
} else {
throw new ExtractorException(cause);
}
} catch (final Exception ex) {
throw new ProcessingException(ex);
}
}
protected abstract T _fromString(String value) throws Exception;
@Override
public String toString(final T value) throws IllegalArgumentException {
return value.toString();
}
}
/**
* Provider of {@link ParamConverter param converter} that produce the target Java type instance
* by invoking a single {@code String} parameter constructor on the target type.
*/
@Singleton
public static class StringConstructor implements ParamConverterProvider {
@Override
public ParamConverter getConverter(final Class rawType, final Type genericType, final Annotation[] annotations) {
final Constructor constructor = AccessController.doPrivileged(ReflectionHelper.getStringConstructorPA(rawType));
return (constructor == null) ? null : new AbstractStringReader() {
@Override
protected T _fromString(final String value) throws Exception {
return rawType.cast(constructor.newInstance(value));
}
};
}
}
/**
* Provider of {@link ParamConverter param converter} that produce the target Java type instance
* by invoking a static {@code valueOf(String)} method on the target type.
*/
@Singleton
public static class TypeValueOf implements ParamConverterProvider {
@Override
public ParamConverter getConverter(final Class rawType, final Type genericType, final Annotation[] annotations) {
final Method valueOf = AccessController.doPrivileged(ReflectionHelper.getValueOfStringMethodPA(rawType));
return (valueOf == null) ? null : new AbstractStringReader() {
@Override
public T _fromString(final String value) throws Exception {
return rawType.cast(valueOf.invoke(null, value));
}
};
}
}
/**
* Provider of {@link ParamConverter param converter} that produce the target Java type instance
* by invoking a static {@code fromString(String)} method on the target type.
*/
@Singleton
public static class TypeFromString implements ParamConverterProvider {
@Override
public ParamConverter getConverter(final Class rawType, final Type genericType, final Annotation[] annotations) {
final Method fromStringMethod = AccessController.doPrivileged(ReflectionHelper.getFromStringStringMethodPA(rawType));
return (fromStringMethod == null) ? null : new AbstractStringReader() {
@Override
public T _fromString(final String value) throws Exception {
return rawType.cast(fromStringMethod.invoke(null, value));
}
};
}
}
/**
* Provider of {@link ParamConverter param converter} that produce the target Java {@link Enum enum} type instance
* by invoking a static {@code fromString(String)} method on the target enum type.
*/
@Singleton
public static class TypeFromStringEnum extends TypeFromString {
@Override
public ParamConverter getConverter(final Class rawType, final Type genericType, final Annotation[] annotations) {
return (!Enum.class.isAssignableFrom(rawType)) ? null : super.getConverter(rawType, genericType, annotations);
}
}
/**
* Provider of {@link ParamConverter param converter} that convert the supplied string into a Java
* {@link Date} instance using conversion method from the
* {@link HttpDateFormat http date formatter} utility class.
*/
@Singleton
public static class DateProvider implements ParamConverterProvider {
@Override
public ParamConverter getConverter(final Class rawType, final Type genericType, final Annotation[] annotations) {
return (rawType != Date.class) ? null : new ParamConverter() {
@Override
public T fromString(final String value) {
try {
return rawType.cast(HttpDateFormat.readDate(value));
} catch (final ParseException ex) {
throw new ExtractorException(ex);
}
}
@Override
public String toString(final T value) throws IllegalArgumentException {
return value.toString();
}
};
}
}
/**
* Aggregated {@link ParamConverterProvider param converter provider}.
*/
@Singleton
public static class AggregatedProvider implements ParamConverterProvider {
private final ParamConverterProvider[] providers;
/**
* Create new aggregated {@link ParamConverterProvider param converter provider}.
*
* @param locator HK2 service locator.
*/
public AggregatedProvider(@Context final ServiceLocator locator) {
providers = new ParamConverterProvider[]{
// ordering is important (e.g. Date provider must be executed before String Constructor
// as Date has a deprecated String constructor
locator.createAndInitialize(DateProvider.class),
locator.createAndInitialize(TypeFromStringEnum.class),
locator.createAndInitialize(TypeValueOf.class),
locator.createAndInitialize(TypeFromString.class),
locator.createAndInitialize(StringConstructor.class),
locator.createAndInitialize(JaxbStringReaderProvider.RootElementProvider.class)
};
}
@Override
public ParamConverter getConverter(final Class rawType, final Type genericType, final Annotation[] annotations) {
for (final ParamConverterProvider p : providers) {
// This iteration trough providers is important. It can't be replaced by just registering all the internal
// providers of this class. Using iteration trough array the correct ordering of providers is ensured (see
// javadoc of PathParam, HeaderParam, ... - there is defined a fixed order of constructing objects form Strings).
final ParamConverter reader = p.getConverter(rawType, genericType, annotations);
if (reader != null) {
return reader;
}
}
return null;
}
}
}