sg.atom.utils.datastructure.parser.ToLowerCaseParser.java Source code

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Here is the source code for sg.atom.utils.datastructure.parser.ToLowerCaseParser.java

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/*
 * Copyright 2011,2012 Metamarkets Group Inc.
 *
 * 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 sg.atom.utils.datastructure.parser;

import com.google.common.base.Preconditions;
import com.google.common.collect.Maps;
import com.metamx.common.exception.FormattedException;

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

/**
 */
public class ToLowerCaseParser implements Parser<String, Object> {
    private final Parser baseParser;

    public ToLowerCaseParser(Parser baseParser) {
        this.baseParser = baseParser;
    }

    @Override
    public Map parse(String input) throws FormattedException {
        Map<String, Object> line = baseParser.parse(input);
        Map<String, Object> retVal = Maps.newLinkedHashMap();
        for (Map.Entry<String, Object> entry : line.entrySet()) {
            String k = entry.getKey().toLowerCase();

            if (retVal.containsKey(k)) {
                // Duplicate key, case-insensitively
                throw new FormattedException.Builder().withErrorCode(FormattedException.ErrorCode.UNPARSABLE_ROW)
                        .withMessage(String.format("Duplicate key [%s]", k)).build();
            }

            retVal.put(k, entry.getValue());
        }
        return retVal;
    }

    @Override
    public void setFieldNames(Iterable<String> fieldNames) {
        baseParser.setFieldNames(fieldNames);
    }

    @Override
    public List<String> getFieldNames() {
        return baseParser.getFieldNames();
    }
}