com.bitsofproof.dropwizard.supernode.jackson.TransactionDeserializer.java Source code

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Here is the source code for com.bitsofproof.dropwizard.supernode.jackson.TransactionDeserializer.java

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/*
 * Copyright 2013 bits of proof zrt.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.bitsofproof.dropwizard.supernode.jackson;

import com.bitsofproof.supernode.api.Transaction;
import com.bitsofproof.supernode.common.WireFormat;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.std.FromStringDeserializer;
import com.fasterxml.jackson.databind.introspect.Annotated;

import java.io.IOException;
import java.util.Objects;

public class TransactionDeserializer extends FromStringDeserializer<Transaction> implements ContextualDeserializer {
    protected TransactionDeserializer() {
        super(Transaction.class);
    }

    @Override
    protected Transaction _deserialize(String value, DeserializationContext ctxt) throws IOException {
        throw new IllegalStateException("This method should be implemented by a subclass");
    }

    @Override
    public JsonDeserializer<?> createContextual(DeserializationContext ctxt, BeanProperty property)
            throws JsonMappingException {
        if (property != null) {
            JsonFormat.Value format = ctxt.getAnnotationIntrospector().findFormat((Annotated) property.getMember());
            if (format != null && Objects.equals(TransactionSerializer.BASE64_FORMAT, format.getPattern())) {
                return new Base64TransactionDeserializer();
            }
        }

        return new HexTransactionDeserializer();
    }

    private static class HexTransactionDeserializer extends TransactionDeserializer {
        @Override
        protected Transaction _deserialize(String value, DeserializationContext ctxt) throws IOException {
            return Transaction.fromWireDump(value);
        }
    }

    private static class Base64TransactionDeserializer extends TransactionDeserializer {
        @Override
        protected Transaction _deserialize(String value, DeserializationContext ctxt) throws IOException {
            byte[] bytes = ctxt.getConfig().getBase64Variant().decode(value);
            return Transaction.fromWire(new WireFormat.Reader(bytes));
        }
    }
}