de.tu_berlin.dima.oligos.profiler.TableProfiler.java Source code

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/*******************************************************************************
 * Copyright 2013 DIMA Research Group, TU Berlin (http://www.dima.tu-berlin.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.tu_berlin.dima.oligos.profiler;

import java.sql.SQLException;
import java.util.LinkedHashSet;
import java.util.Set;

import com.google.common.collect.Sets;

import de.tu_berlin.dima.oligos.db.TableConnector;
import de.tu_berlin.dima.oligos.stat.Column;
import de.tu_berlin.dima.oligos.stat.Table;

public class TableProfiler implements Profiler<Table> {

    private final String schema;
    private final String table;
    private final TableConnector connector;
    private final Set<ColumnProfiler<?>> columnProfilers;

    public TableProfiler(final String schema, final String table, final TableConnector connector) {
        this(schema, table, connector, new LinkedHashSet<ColumnProfiler<?>>());
    }

    public TableProfiler(final String schema, final String table, final TableConnector connector,
            final Set<ColumnProfiler<?>> columnProfilers) {
        this.schema = schema;
        this.table = table;
        this.connector = connector;
        this.columnProfilers = columnProfilers;
    }

    public void addColumnProfiler(final ColumnProfiler<?> columnProfiler) {
        columnProfilers.add(columnProfiler);
    }

    public Table profile() {
        try {
            long cardinality = connector.getCardinality(schema, table);
            Set<Column<?>> columns = getColumnStatistics();
            return new Table(schema, table, cardinality, columns);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    private Set<Column<?>> getColumnStatistics() {
        Set<Column<?>> columns = Sets.newLinkedHashSet();
        for (ColumnProfiler<?> profiler : this.columnProfilers) {
            Column<?> column = profiler.profile();
            columns.add(column);
        }
        return columns;
    }

}