com.dslplatform.json.runtime.ArrayAnalyzer Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of dsl-json-java8
DSL Platform compatible Java JSON library (https://dsl-platform.com)
The newest version!
package com.dslplatform.json.runtime;

import com.dslplatform.json.*;

import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public abstract class ArrayAnalyzer {

	public static class Runtime {
		public static final JsonReader.ReadObject JSON_READER = new JsonReader.ReadObject() {
			@Override
			public Object[] read(JsonReader reader) throws IOException {
				if (reader.wasNull()) return null;
				return ObjectConverter.deserializeList(reader).toArray();
			}
		};
		public static final JsonWriter.WriteObject JSON_WRITER = new JsonWriter.WriteObject() {
			@Override
			public void write(JsonWriter writer, @Nullable Object[] value) {
				if (value == null) {
					writer.writeNull();
				} else if (value.length == 0) {
					writer.writeAscii("[]");
				} else {
					writer.writeByte(JsonWriter.ARRAY_START);
					writer.serializeObject(value[0]);
					for(int i = 1; i < value.length; i++) {
						writer.writeByte(JsonWriter.COMMA);
						writer.serializeObject(value[i]);
					}
					writer.writeByte(JsonWriter.ARRAY_END);
				}
			}
		};
	}

	public static final DslJson.ConverterFactory READER = new DslJson.ConverterFactory() {
		@Nullable
		@Override
		public ArrayDecoder tryCreate(Type manifest, DslJson dslJson) {
			if (manifest instanceof Class) {
				final Class array = (Class) manifest;
				if (array.isArray()) {
					return analyzeDecoder(manifest, array.getComponentType(), dslJson);
				}
			}
			if (manifest instanceof GenericArrayType) {
				final GenericArrayType gat = (GenericArrayType) manifest;
				return analyzeDecoder(manifest, gat.getGenericComponentType(), dslJson);
			}
			return null;
		}
	};

	public static final DslJson.ConverterFactory WRITER = new DslJson.ConverterFactory() {
		@Nullable
		@Override
		public ArrayEncoder tryCreate(Type manifest, DslJson dslJson) {
			if (manifest instanceof Class) {
				final Class array = (Class) manifest;
				if (array.isArray()) {
					return analyzeEncoder(manifest, array.getComponentType(), dslJson);
				}
			}
			if (manifest instanceof GenericArrayType) {
				final GenericArrayType gat = (GenericArrayType) manifest;
				return analyzeEncoder(manifest, gat.getGenericComponentType(), dslJson);
			}
			return null;
		}
	};

	@Nullable
	private static Class checkSignature(final Type element) {
		final Class raw;
		if (element instanceof Class) {
			raw = (Class)element;
		} else if (element instanceof ParameterizedType) {
			final ParameterizedType pt = (ParameterizedType) element;
			raw = (Class) pt.getRawType();
		} else {
			return null;
		}
		if (raw.isPrimitive()) return null;
		return raw;
	}

	@Nullable
	private static  ArrayDecoder analyzeDecoder(final Type manifest, final Type element, final DslJson json) {
		final Class raw = checkSignature(element);
		if (raw == null) return null;
		final JsonReader.ReadObject reader = json.tryFindReader(element);
		if (reader == null) {
			return null;
		}
		final ArrayDecoder decoder = new ArrayDecoder((T[])Array.newInstance(raw, 0), reader);
		json.registerReader(manifest, decoder);
		return decoder;
	}

	@Nullable
	private static  ArrayEncoder analyzeEncoder(final Type manifest, final Type element, final DslJson json) {
		final Class raw = checkSignature(element);
		if (raw == null) return null;
		final JsonWriter.WriteObject writer = Object.class == element ? null : json.tryFindWriter(element);
		if (Object.class != element && writer == null) {
			return null;
		}
		final ArrayEncoder encoder = new ArrayEncoder(json, Settings.isKnownType(element) ? writer : null);
		json.registerWriter(manifest, encoder);
		return encoder;
	}
}