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*
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*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
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* file and include the License file at packager/legal/LICENSE.txt.
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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.text.ParseException;
import java.util.Date;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.ProcessingException;
import org.glassfish.jersey.internal.util.ReflectionHelper;
import org.glassfish.jersey.message.internal.HttpDateFormat;
import org.glassfish.jersey.spi.StringValueReader;
import org.glassfish.jersey.spi.StringValueReaderProvider;
import org.glassfish.hk2.api.ServiceLocator;
/**
* Container of several different {@link StringValueReaderProvider string reader provider}
* 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 StringReaderProviders {
private static abstract class AbstractStringReader implements StringValueReader {
@Override
public T fromString(String value) {
try {
return _fromString(value);
} catch (InvocationTargetException ex) {
// if the value is an empty string, return null
if (value.length() == 0) {
return null;
}
Throwable target = ex.getTargetException();
if (target instanceof WebApplicationException) {
throw (WebApplicationException) target;
} else {
throw new ExtractorException(target);
}
} catch (Exception ex) {
throw new ProcessingException(ex);
}
}
protected abstract T _fromString(String value) throws Exception;
}
/**
* Provider of string readers 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 StringValueReaderProvider {
@Override
public StringValueReader getStringReader(final Class type, Type genericType, Annotation[] annotations) {
final Constructor constructor = ReflectionHelper.getStringConstructor(type);
return (constructor == null) ? null : new AbstractStringReader() {
@Override
protected T _fromString(String value) throws Exception {
return type.cast(constructor.newInstance(value));
}
};
}
}
/**
* Provider of string readers 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 StringValueReaderProvider {
@Override
public StringValueReader getStringReader(final Class type, Type genericType, Annotation[] annotations) {
final Method valueOf = ReflectionHelper.getValueOfStringMethod(type);
return (valueOf == null) ? null : new AbstractStringReader() {
@Override
public T _fromString(String value) throws Exception {
return type.cast(valueOf.invoke(null, value));
}
};
}
}
/**
* Provider of string readers 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 StringValueReaderProvider {
@Override
public StringValueReader getStringReader(final Class type, Type genericType, Annotation[] annotations) {
final Method fromStringMethod = ReflectionHelper.getFromStringStringMethod(type);
return (fromStringMethod == null) ? null : new AbstractStringReader() {
@Override
public T _fromString(String value) throws Exception {
return type.cast(fromStringMethod.invoke(null, value));
}
};
}
}
/**
* Provider of string readers 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 StringValueReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
return (!Enum.class.isAssignableFrom(type)) ? null : super.getStringReader(type, genericType, annotations);
}
}
/**
* Provider of string readers 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 StringValueReaderProvider {
@Override
public StringValueReader getStringReader(final Class type, Type genericType, Annotation[] annotations) {
return (type != Date.class) ? null : new StringValueReader() {
@Override
public T fromString(String value) {
try {
return type.cast(HttpDateFormat.readDate(value));
} catch (ParseException ex) {
throw new ExtractorException(ex);
}
}
};
}
}
/**
* Aggregated string value reader provider.
*/
@Singleton
public static class AggregatedProvider implements StringValueReaderProvider {
private final StringValueReaderProvider[] providers;
/**
* Create new aggregated string value reader provider.
*
* @param locator HK2 service locator.
*/
public AggregatedProvider(@Context ServiceLocator locator) {
providers = new StringValueReaderProvider[]{
locator.createAndInitialize(TypeFromStringEnum.class),
locator.createAndInitialize(TypeValueOf.class),
locator.createAndInitialize(TypeFromString.class),
locator.createAndInitialize(StringConstructor.class),
locator.createAndInitialize(DateProvider.class),
locator.createAndInitialize(JaxbStringReaderProvider.RootElementProvider.class)
};
}
@Override
public StringValueReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
for (StringValueReaderProvider p : providers) {
final StringValueReader reader = p.getStringReader(type, genericType, annotations);
if (reader != null) {
return reader;
}
}
return null;
}
}
}
