LongDateTypeAdapter.java Source code

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Here is the source code for LongDateTypeAdapter.java

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/*
 * Copyright (C) 2015 Gson Type Adapter 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.
 */
import java.io.IOException;
import java.util.Date;

import com.google.gson.JsonSyntaxException;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

/**
 * A Type adapter for {@link Date} that uses millisecond long values to write out date.
 * Remember to use an appropriate long serialization policy to avoid JSON parsers trimming
 * longs to a shorter value.
 *
 * @author Inderjeet Singh
 */
public class LongDateTypeAdapter extends TypeAdapter<Date> {

    @Override
    public void write(JsonWriter out, Date value) throws IOException {
        if (value == null) {
            out.nullValue();
        } else {
            out.value(String.valueOf(value.getTime()));
        }
    }

    @Override
    public Date read(JsonReader in) throws IOException {
        switch (in.peek()) {
        case NULL:
            return null;
        case STRING:
            try {
                return new Date(Long.parseLong(in.nextString()));
            } catch (NumberFormatException e) {
                throw new JsonSyntaxException(e);
            }
        default:
            throw new JsonSyntaxException("invalid date" + in.getPath());
        }
    }
}