org.iff.infra.util.jaxrs.gson.GsonHashCode.java Source code

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Here is the source code for org.iff.infra.util.jaxrs.gson.GsonHashCode.java

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/*
 * Copyright (C) the original author or authors.
 *
 * 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 org.iff.infra.util.jaxrs.gson;

import java.io.IOException;

import com.google.common.hash.HashCode;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;

/**
 * Gson representation for {@link HashCode}.
 * @author Andres Rodriguez
 */
public final class GsonHashCode extends TypeAdapter<HashCode> {
    /** Constructor. */
    public GsonHashCode() {
    }

    /*
     * (non-Javadoc)
     * @see com.google.gson.TypeAdapter#read(com.google.gson.stream.JsonReader)
     */
    @Override
    public HashCode read(JsonReader in) throws IOException {
        if (in.peek() == JsonToken.NULL) {
            in.nextNull();
            return null;
        }
        final String string = in.nextString();
        final ByteString byteString = ByteString.fromHexString(string);
        if (byteString.isEmpty()) {
            return null;
        }
        return byteString.toHashCode();
    }

    /*
     * (non-Javadoc)
     * @see com.google.gson.TypeAdapter#write(com.google.gson.stream.JsonWriter, java.lang.Object)
     */
    @Override
    public void write(JsonWriter out, HashCode value) throws IOException {
        if (value == null) {
            out.nullValue();
            return;
        }
        out.value(value.toString());
    }
}