org.apache.gobblin.qualitychecker.row.RowLevelPolicyCheckerBuilder.java Source code

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Here is the source code for org.apache.gobblin.qualitychecker.row.RowLevelPolicyCheckerBuilder.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.gobblin.qualitychecker.row;

import org.apache.gobblin.configuration.ConfigurationKeys;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Splitter;
import com.google.common.collect.Lists;

import org.apache.gobblin.configuration.State;
import org.apache.gobblin.util.ForkOperatorUtils;
import org.apache.gobblin.util.WriterUtils;

public class RowLevelPolicyCheckerBuilder {
    private final State state;
    private final int index;

    private static final Logger LOG = LoggerFactory.getLogger(RowLevelPolicyCheckerBuilder.class);

    public RowLevelPolicyCheckerBuilder(State state, int index) {
        this.state = state;
        this.index = index;
    }

    @SuppressWarnings("unchecked")
    private List<RowLevelPolicy> createPolicyList() throws Exception {
        List<RowLevelPolicy> list = new ArrayList<>();
        Splitter splitter = Splitter.on(",").omitEmptyStrings().trimResults();
        String rowLevelPoliciesKey = ForkOperatorUtils
                .getPropertyNameForBranch(ConfigurationKeys.ROW_LEVEL_POLICY_LIST, this.index);
        String rowLevelPolicyTypesKey = ForkOperatorUtils
                .getPropertyNameForBranch(ConfigurationKeys.ROW_LEVEL_POLICY_LIST_TYPE, this.index);
        if (this.state.contains(rowLevelPoliciesKey) && this.state.contains(rowLevelPolicyTypesKey)) {
            List<String> policies = Lists.newArrayList(splitter.split(this.state.getProp(rowLevelPoliciesKey)));
            List<String> types = Lists.newArrayList(splitter.split(this.state.getProp(rowLevelPolicyTypesKey)));
            if (policies.size() != types.size()) {
                throw new Exception("Row Policies list and Row Policies list type are not the same length");
            }
            for (int i = 0; i < policies.size(); i++) {
                try {
                    Class<? extends RowLevelPolicy> policyClass = (Class<? extends RowLevelPolicy>) Class
                            .forName(policies.get(i));
                    Constructor<? extends RowLevelPolicy> policyConstructor = policyClass
                            .getConstructor(State.class, RowLevelPolicy.Type.class);
                    RowLevelPolicy policy = policyConstructor.newInstance(this.state,
                            RowLevelPolicy.Type.valueOf(types.get(i)));
                    list.add(policy);
                } catch (Exception e) {
                    LOG.error(rowLevelPoliciesKey + " contains a class " + policies.get(i)
                            + " which doesn't extend RowLevelPolicy.", e);
                    throw e;
                }
            }
        }
        return list;
    }

    public static RowLevelPolicyCheckerBuilder newBuilder(State state, int index) {
        return new RowLevelPolicyCheckerBuilder(state, index);
    }

    public RowLevelPolicyChecker build() throws Exception {
        return new RowLevelPolicyChecker(createPolicyList(), this.state.getId(),
                WriterUtils.getWriterFS(this.state, 1, 0), this.state);
    }
}