org.apache.gobblin.converter.jdbc.JdbcEntrySchema.java Source code

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Here is the source code for org.apache.gobblin.converter.jdbc.JdbcEntrySchema.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.converter.jdbc;

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

import lombok.EqualsAndHashCode;
import lombok.ToString;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedMap;

@ToString
@EqualsAndHashCode
public class JdbcEntrySchema implements Iterable<JdbcEntryMetaDatum> {
    private final Map<String, JdbcEntryMetaDatum> jdbcMetaData; //Pair of column name and JdbcType

    public JdbcEntrySchema(Iterable<JdbcEntryMetaDatum> jdbcMetaDatumEntries) {
        Preconditions.checkNotNull(jdbcMetaDatumEntries);
        ImmutableMap.Builder<String, JdbcEntryMetaDatum> builder = ImmutableSortedMap.naturalOrder();
        for (JdbcEntryMetaDatum datum : jdbcMetaDatumEntries) {
            builder.put(datum.getColumnName(), datum);
        }
        this.jdbcMetaData = builder.build();
    }

    /**
     * @param columnName Column name case sensitive, as most of RDBMS does.
     * @return Returns JdbcType. If column name does not exist, returns null.
     */
    public JdbcType getJdbcType(String columnName) {
        JdbcEntryMetaDatum datum = this.jdbcMetaData.get(columnName);
        return datum == null ? null : datum.getJdbcType();
    }

    public Set<String> getColumnNames() {
        return this.jdbcMetaData.keySet();
    }

    /**
     * Provides iterator sorted by column name
     * {@inheritDoc}
     * @see java.lang.Iterable#iterator()
     */
    @Override
    public Iterator<JdbcEntryMetaDatum> iterator() {
        return this.jdbcMetaData.values().iterator();
    }
}