StringReaderProviders.java

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package com.sun.jersey.server.impl.model.parameter.multivalued;

import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.core.header.HttpDateFormat;
import com.sun.jersey.core.reflection.ReflectionHelper;
import com.sun.jersey.spi.StringReader;
import com.sun.jersey.spi.StringReaderProvider;
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;

/**
 *
 * @author Paul.Sandoz@Sun.Com
 */
public class StringReaderProviders {

    private static abstract class AbstractStringReader implements StringReader {

        public Object fromString(String value) {
            try {
                return _fromString(value);
            } catch (InvocationTargetException ex) {
                Throwable target = ex.getTargetException();
                if (target instanceof WebApplicationException) {
                    throw (WebApplicationException)target;
                } else {
                    throw new ExtractorContainerException(target);
                }
            } catch (Exception ex) {
                throw new ContainerException(ex);
            }
        }

        protected abstract Object _fromString(String value) throws Exception;
    }

    public static class StringConstructor implements StringReaderProvider {

        public StringReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
            final Constructor constructor = ReflectionHelper.getStringConstructor(type);
            if (constructor == null)
                return null;

            return new AbstractStringReader() {
                protected Object _fromString(String value) throws Exception {
                    return constructor.newInstance(value);
                }
            };
        }
    }

    public static class TypeValueOf implements StringReaderProvider {

        public StringReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
            final Method valueOf = ReflectionHelper.getValueOfStringMethod(type);
            if (valueOf == null)
                return null;

            return new AbstractStringReader() {
                public Object _fromString(String value) throws Exception {
                    return valueOf.invoke(null, value);
                }
            };
        }
    }

    public static class TypeFromString implements StringReaderProvider {

        public StringReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
            final Method fromString = ReflectionHelper.getFromStringStringMethod(type);
            if (fromString == null)
                return null;

            return new AbstractStringReader() {
                public Object _fromString(String value) throws Exception {
                    return fromString.invoke(null, value);
                }
            };
        }
    }

    public static class TypeFromStringEnum extends TypeFromString {

        @Override
        public StringReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
            if (!Enum.class.isAssignableFrom(type))
                return null;
            
            return super.getStringReader(type, genericType, annotations);
        }
    }

    public static class DateProvider implements StringReaderProvider {

        public StringReader getStringReader(Class type, Type genericType, Annotation[] annotations) {
            if (type != Date.class)
                return null;
            
            return new StringReader() {
                public Object fromString(String value) {
                    try {
                        return HttpDateFormat.readDate(value);
                    } catch (ParseException ex) {
                        throw new ExtractorContainerException(ex);
                    }
                }
            };
        }
    }
}