com.cloudera.exhibit.core.composite.NeighborLookup.java Source code

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Here is the source code for com.cloudera.exhibit.core.composite.NeighborLookup.java

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/*
 * Copyright (c) 2015, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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 com.cloudera.exhibit.core.composite;

import com.cloudera.exhibit.core.Column;
import com.cloudera.exhibit.core.ExhibitId;
import com.cloudera.exhibit.core.Frame;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

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

public class NeighborLookup {
    private final Map<String, String> columnToEntity;

    public static NeighborLookup create(String column, String entity, String... args) {
        Map<String, String> cte = Maps.newHashMap();
        cte.put(column, entity);
        for (int i = 0; i < args.length; i += 2) {
            cte.put(args[i], args[i + 1]);
        }
        return new NeighborLookup(cte);
    }

    public NeighborLookup(Map<String, String> columnToEntity) {
        this.columnToEntity = columnToEntity;
    }

    public Set<ExhibitId> lookupIds(Frame frame) {
        Set<ExhibitId> ids = Sets.newHashSet();
        for (Map.Entry<String, String> e : columnToEntity.entrySet()) {
            Column column = Column.create(frame, e.getKey());
            for (Object value : column) {
                ids.add(ExhibitId.create(e.getValue(), value));
            }
        }
        return ids;
    }
}