co.cask.cdap.internal.filesystem.LocationCodec.java Source code

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Here is the source code for co.cask.cdap.internal.filesystem.LocationCodec.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * 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 co.cask.cdap.internal.filesystem;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import org.apache.twill.filesystem.Location;
import org.apache.twill.filesystem.LocationFactory;

import java.lang.reflect.Type;
import java.net.URI;
import java.net.URISyntaxException;

/**
 * Codec for {@link Location}. We write {@link java.net.URI} for location.
 */
public final class LocationCodec implements JsonSerializer<Location>, JsonDeserializer<Location> {
    private final LocationFactory lf;

    public LocationCodec(LocationFactory lf) {
        this.lf = lf;
    }

    @Override
    public JsonElement serialize(Location src, Type typeOfSrc, JsonSerializationContext context) {
        JsonObject jsonObj = new JsonObject();
        jsonObj.add("uri", new JsonPrimitive(src.toURI().toASCIIString()));
        return jsonObj;
    }

    @Override
    public Location deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
        JsonObject jsonObj = json.getAsJsonObject();
        String uri = jsonObj.get("uri").getAsString();
        try {
            return lf.create(new URI(uri));
        } catch (URISyntaxException e) {
            // should never happen
            throw new IllegalStateException("Invalid uri " + uri + " found. Cannot deserialize location.", e);
        }
    }
}