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parallel structure for JSonSerializer/DeserializerWithAccessFilter

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Michael Hoennig
2019-04-23 06:57:06 +02:00
parent 90316a262b
commit bb0fb4aa78
4 changed files with 46 additions and 21 deletions
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3
src/main/java/org/hostsharing/hsadminng/service/accessfilter/JSonDeserializerWithAccessFilter.java
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@@ -20,9 +20,10 @@ public class JSonDeserializerWithAccessFilter<T> {
public JSonDeserializerWithAccessFilter(final JsonParser jsonParser, final DeserializationContext deserializationContext, Class<T> dtoClass) {
this.treeNode = unchecked(() -> jsonParser.getCodec().readTree(jsonParser));
this.dto = unchecked(() -> dtoClass.newInstance());
this.dto = unchecked(dtoClass::newInstance);
}
// Jackson deserializes from the JsonParser, thus no input parameter needed.
public T deserialize() {
treeNode.fieldNames().forEachRemaining(fieldName -> {
try {

26
src/main/java/org/hostsharing/hsadminng/service/accessfilter/JSonSerializerWithAccessFilter.java
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@@ -13,21 +13,26 @@ import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
@JsonComponent
public class JSonSerializerWithAccessFilter extends JsonSerializer<Object> {
public class JSonSerializerWithAccessFilter <T> {
private final JsonGenerator jsonGenerator;
private final SerializerProvider serializerProvider;
private final T dto;
@Override
public void serialize(final Object dto, final JsonGenerator jsonGenerator,
final SerializerProvider serializerProvider) throws IOException {
public JSonSerializerWithAccessFilter(final JsonGenerator jsonGenerator,
final SerializerProvider serializerProvider,
final T dto) {
this.jsonGenerator = jsonGenerator;
this.serializerProvider = serializerProvider;
this.dto = dto;
}
// Jackson serializes into the JsonGenerator, thus no return value needed.
public void serialize() throws IOException {
// TODO: Move the implementation to an (if necessary, inner) class, or maybe better
// expose just the inner implementation from an explicit @JsonCompontent
// as it's necessary for the deserializers anyway.
jsonGenerator.writeStartObject();
for (Field prop : dto.getClass().getDeclaredFields()) {
toJSon(dto, jsonGenerator, prop);
}
jsonGenerator.writeEndObject();
}
@@ -35,9 +40,10 @@ public class JSonSerializerWithAccessFilter extends JsonSerializer<Object> {
if (getLoginUserRole().isAllowedToRead(prop)) {
final String fieldName = prop.getName();
// TODO: maybe replace by serializerProvider.defaultSerialize...()?
// But that's difficult for parallel structure with the deserializer, where the API is ugly.
// But that makes it difficult for parallel structure with the deserializer (clumsy API).
// Alternatively extract the supported types to subclasses of some abstract class and
// here as well as in the deserializer just access the matching implementation through a map.
// Or even completely switch from Jackson to GSON?
if (Integer.class.isAssignableFrom(prop.getType()) || int.class.isAssignableFrom(prop.getType())) {
jsonGenerator.writeNumberField(fieldName, (int) get(dto, prop));
} else if (Long.class.isAssignableFrom(prop.getType()) || long.class.isAssignableFrom(prop.getType())) {

21
src/main/java/org/hostsharing/hsadminng/service/dto/CustomerDTO.java
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@@ -1,13 +1,17 @@
package org.hostsharing.hsadminng.service.dto;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.TreeNode;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.node.IntNode;
import com.fasterxml.jackson.databind.node.TextNode;
import org.hostsharing.hsadminng.service.accessfilter.AccessFor;
import org.hostsharing.hsadminng.service.accessfilter.JSonDeserializerWithAccessFilter;
import org.hostsharing.hsadminng.service.accessfilter.JSonSerializerWithAccessFilter;
import org.hostsharing.hsadminng.service.accessfilter.Role;
import org.springframework.boot.jackson.JsonComponent;
@@ -171,13 +175,26 @@ public class CustomerDTO implements Serializable {
}
@JsonComponent
public static class UserJsonDeserializer extends JsonDeserializer<CustomerDTO> {
public static class CustomerJsonSerializer extends JsonSerializer<CustomerDTO> {
@Override
public void serialize(final CustomerDTO customerDTO, final JsonGenerator jsonGenerator,
final SerializerProvider serializerProvider) throws IOException {
new JSonSerializerWithAccessFilter<>(jsonGenerator, serializerProvider, customerDTO).serialize();
}
}
@JsonComponent
public static class CustomerJsonDeserializer extends JsonDeserializer<CustomerDTO> {
@Override
public CustomerDTO deserialize(final JsonParser jsonParser,
final DeserializationContext deserializationContext) {
return new JSonDeserializerWithAccessFilter<>(jsonParser, deserializationContext, CustomerDTO.class).deserialize();
return new JSonDeserializerWithAccessFilter<>(jsonParser, deserializationContext, CustomerDTO.class).deserialize();
}
}
}