ValidatePersistentObjectVersionExists.java

/*
 * Copyright 2016 The Simple File Server 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.sfs.validate;

import com.google.common.base.Optional;
import io.vertx.core.json.JsonObject;
import org.sfs.util.HttpRequestValidationException;
import org.sfs.vo.PersistentObject;
import org.sfs.vo.TransientVersion;
import rx.functions.Func1;

import static java.lang.String.format;
import static java.net.HttpURLConnection.HTTP_NOT_FOUND;

public class ValidatePersistentObjectVersionExists implements Func1<PersistentObject, TransientVersion> {

    private final long version;

    public ValidatePersistentObjectVersionExists(long version) {
        this.version = version;
    }

    @Override
    public TransientVersion call(PersistentObject persistentObject) {
        Optional<TransientVersion> found = persistentObject.getVersion(version);
        if (!found.isPresent()) {

            JsonObject jsonObject = new JsonObject()
                    .put("message", format("Version %d does not exist", version));

            throw new HttpRequestValidationException(HTTP_NOT_FOUND, jsonObject);
        }
        return found.get();
    }
}