org.apache.druid.java.util.common.parsers.DelimitedParser.java Source code

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Here is the source code for org.apache.druid.java.util.common.parsers.DelimitedParser.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.druid.java.util.common.parsers;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;

import javax.annotation.Nullable;
import java.util.List;

public class DelimitedParser extends AbstractFlatTextFormatParser {
    private final String delimiter;
    private final Splitter splitter;

    public DelimitedParser(@Nullable final String delimiter, @Nullable final String listDelimiter,
            final boolean hasHeaderRow, final int maxSkipHeaderRows) {
        super(listDelimiter, hasHeaderRow, maxSkipHeaderRows);
        this.delimiter = delimiter != null ? delimiter : FlatTextFormat.DELIMITED.getDefaultDelimiter();

        Preconditions.checkState(!this.delimiter.equals(getListDelimiter()),
                "Cannot have same delimiter and list delimiter of [%s]", this.delimiter);

        this.splitter = Splitter.on(this.delimiter);
    }

    public DelimitedParser(@Nullable final String delimiter, @Nullable final String listDelimiter,
            final Iterable<String> fieldNames, final boolean hasHeaderRow, final int maxSkipHeaderRows) {
        this(delimiter, listDelimiter, hasHeaderRow, maxSkipHeaderRows);

        setFieldNames(fieldNames);
    }

    @VisibleForTesting
    DelimitedParser(@Nullable final String delimiter, @Nullable final String listDelimiter, final String header) {
        this(delimiter, listDelimiter, false, 0);

        setFieldNames(header);
    }

    @Override
    protected List<String> parseLine(String input) {
        return splitter.splitToList(input);
    }
}