All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.fasterxml.jackson.databind.deser.std.EnumMapDeserializer Maven / Gradle / Ivy

The newest version!
package com.fasterxml.jackson.databind.deser.std;

import java.io.IOException;
import java.util.*;

import com.fasterxml.jackson.core.*;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;

/**
 * Deserializer for {@link EnumMap} values.
 * 

* Note: casting within this class is all messed up -- just could not figure out a way * to properly deal with recursive definition of "EnumMap, V> * * @author tsaloranta */ @SuppressWarnings({ "unchecked", "rawtypes" }) public class EnumMapDeserializer extends StdDeserializer> implements ContextualDeserializer { private static final long serialVersionUID = 4564890642370311174L; protected final JavaType _mapType; protected final Class _enumClass; protected JsonDeserializer> _keyDeserializer; protected JsonDeserializer _valueDeserializer; /** * If value instances have polymorphic type information, this * is the type deserializer that can handle it */ protected final TypeDeserializer _valueTypeDeserializer; /* /********************************************************** /* Life-cycle /********************************************************** */ public EnumMapDeserializer(JavaType mapType, JsonDeserializer keyDeserializer, JsonDeserializer valueDeser, TypeDeserializer valueTypeDeser) { super(EnumMap.class); _mapType = mapType; _enumClass = mapType.getKeyType().getRawClass(); _keyDeserializer = (JsonDeserializer>) keyDeserializer; _valueDeserializer = (JsonDeserializer) valueDeser; _valueTypeDeserializer = valueTypeDeser; } public EnumMapDeserializer withResolved(JsonDeserializer keyDeserializer, JsonDeserializer valueDeserializer, TypeDeserializer valueTypeDeser) { if ((keyDeserializer == _keyDeserializer) && (valueDeserializer == _valueDeserializer) && (valueTypeDeser == _valueTypeDeserializer)) { return this; } return new EnumMapDeserializer(_mapType, keyDeserializer, valueDeserializer, _valueTypeDeserializer); } /** * Method called to finalize setup of this deserializer, * when it is known for which property deserializer is needed for. */ @Override public JsonDeserializer createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException { // note: instead of finding key deserializer, with enums we actually // work with regular deserializers (less code duplication; but not // quite as clean as it ought to be) JsonDeserializer kd = _keyDeserializer; if (kd == null) { kd = ctxt.findContextualValueDeserializer(_mapType.getKeyType(), property); } JsonDeserializer vd = _valueDeserializer; if (vd == null) { vd = ctxt.findContextualValueDeserializer(_mapType.getContentType(), property); } else { // if directly assigned, probably not yet contextual, so: vd = ctxt.handleSecondaryContextualization(vd, property); } TypeDeserializer vtd = _valueTypeDeserializer; if (vtd != null) { vtd = vtd.forProperty(property); } return withResolved(kd, vd, vtd); } /** * Because of costs associated with constructing Enum resolvers, * let's cache instances by default. */ @Override public boolean isCachable() { return true; } /* /********************************************************** /* Actual deserialization /********************************************************** */ @Override public EnumMap deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException { // Ok: must point to START_OBJECT if (jp.getCurrentToken() != JsonToken.START_OBJECT) { throw ctxt.mappingException(EnumMap.class); } EnumMap result = constructMap(); final JsonDeserializer valueDes = _valueDeserializer; final TypeDeserializer typeDeser = _valueTypeDeserializer; while ((jp.nextToken()) != JsonToken.END_OBJECT) { Enum key = _keyDeserializer.deserialize(jp, ctxt); if (key == null) { if (!ctxt.isEnabled(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)) { String value = null; try { // bit ugly, but will have to do; works with usual scalars if (jp.hasCurrentToken()) { value = jp.getText(); } } catch (Exception e) { } throw ctxt.weirdStringException(value, _enumClass, "value not one of declared Enum instance names"); } /* 24-Mar-2012, tatu: Null won't work as a key anyway, so let's * just skip the entry then. But we must skip the value then. */ jp.nextToken(); jp.skipChildren(); continue; } // And then the value... JsonToken t = jp.nextToken(); /* note: MUST check for nulls separately: deserializers will * not handle them (and maybe fail or return bogus data) */ Object value; if (t == JsonToken.VALUE_NULL) { value = valueDes.getNullValue(); } else if (typeDeser == null) { value = valueDes.deserialize(jp, ctxt); } else { value = valueDes.deserializeWithType(jp, ctxt, typeDeser); } result.put(key, value); } return result; } @Override public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException, JsonProcessingException { // In future could check current token... for now this should be enough: return typeDeserializer.deserializeTypedFromObject(jp, ctxt); } private EnumMap constructMap() { return new EnumMap(_enumClass); } }