org.pentaho.di.trans.dataservice.optimization.paramgen.SourceLineageMap.java Source code

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2015 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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.pentaho.di.trans.dataservice.optimization.paramgen;

import com.google.common.base.Predicate;
import com.google.common.collect.ForwardingSetMultimap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimaps;
import com.google.common.collect.SetMultimap;
import org.pentaho.metaverse.api.StepFieldOperations;

import java.util.List;
import java.util.Map;
import java.util.Set;

public class SourceLineageMap extends ForwardingSetMultimap<String, List<StepFieldOperations>> {
    private SetMultimap<String, List<StepFieldOperations>> storage;

    protected SourceLineageMap(SetMultimap<String, List<StepFieldOperations>> storage) {
        this.storage = storage;
    }

    public static SourceLineageMap create() {
        return new SourceLineageMap(HashMultimap.<String, List<StepFieldOperations>>create());
    }

    public static SourceLineageMap create(Map<String, Set<List<StepFieldOperations>>> operationPaths) {
        SourceLineageMap sourceLineageMap = create();
        for (List<StepFieldOperations> lineage : Iterables.concat(operationPaths.values())) {
            if ((lineage != null) && !lineage.isEmpty()) {
                String inputStep = lineage.get(0).getStepName();
                sourceLineageMap.put(inputStep, lineage);
            }
        }
        return sourceLineageMap;
    }

    @Override
    protected SetMultimap<String, List<StepFieldOperations>> delegate() {
        return storage;
    }

    public SourceLineageMap filter(Predicate<? super Map.Entry<String, List<StepFieldOperations>>> predicate) {
        return new SourceLineageMap(Multimaps.filterEntries(storage, predicate));
    }

    public SourceLineageMap filterKeys(Predicate<String> predicate) {
        return new SourceLineageMap(Multimaps.filterKeys(storage, predicate));
    }

}