de.zalando.hackweek.bpm.engine.impl.cassandra.db.handler.SelectHistoricTaskInstanceByIdHandler.java Source code

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Here is the source code for de.zalando.hackweek.bpm.engine.impl.cassandra.db.handler.SelectHistoricTaskInstanceByIdHandler.java

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/**
 * Copyright (C) 2014 Zalando SE (http://www.zalando.de/)
 *
 * 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 de.zalando.hackweek.bpm.engine.impl.cassandra.db.handler;

import static com.google.common.base.Optional.fromNullable;

import com.datastax.driver.core.Row;
import com.datastax.driver.core.Session;

import com.google.common.base.Optional;

import de.zalando.hackweek.bpm.engine.impl.cassandra.db.mapping.HistoricTaskInstanceMapping;

public class SelectHistoricTaskInstanceByIdHandler implements SelectOneHandler {

    private static final String QUERY = "SELECT * FROM camunda.hi_taskinst WHERE id = ?";

    @Override
    public Object selectOne(final Session session, final Object parameter) {
        final String id = (String) parameter;
        final Optional<Row> optionalRow = fromNullable(session.execute(QUERY, id).one());
        return optionalRow.transform(HistoricTaskInstanceMapping.INSTANCE).orNull();
    }
}