com.linkedin.pinot.core.segment.index.readers.StringDictionary.java Source code

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Here is the source code for com.linkedin.pinot.core.segment.index.readers.StringDictionary.java

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/**
 * Copyright (C) 2014-2015 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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 com.linkedin.pinot.core.segment.index.readers;

import java.io.File;
import java.io.IOException;

import org.apache.commons.lang.StringUtils;

import com.linkedin.pinot.common.segment.ReadMode;
import com.linkedin.pinot.core.segment.creator.impl.V1Constants;
import com.linkedin.pinot.core.segment.index.ColumnMetadata;

/**
 * Nov 14, 2014
 */

public class StringDictionary extends ImmutableDictionaryReader {
    private final int lengthofMaxEntry;

    public StringDictionary(File dictFile, ColumnMetadata metadata, ReadMode mode) throws IOException {
        super(dictFile, metadata.getCardinality(), metadata.getStringColumnMaxLength(), mode == ReadMode.mmap);
        lengthofMaxEntry = metadata.getStringColumnMaxLength();
    }

    @Override
    public int indexOf(Object rawValue) {
        final String lookup = rawValue.toString();
        final int differenceInLength = lengthofMaxEntry - lookup.length();
        final StringBuilder bld = new StringBuilder();
        bld.append(lookup);
        for (int i = 0; i < differenceInLength; i++) {
            bld.append(V1Constants.Str.STRING_PAD_CHAR);
        }
        return stringIndexOf(bld.toString());
    }

    @Override
    public String get(int dictionaryId) {
        if ((dictionaryId == -1) || (dictionaryId >= length())) {
            return "null";
        }
        return StringUtils.remove(getString(dictionaryId), String.valueOf(V1Constants.Str.STRING_PAD_CHAR));
    }

    @Override
    public long getLongValue(int dictionaryId) {
        throw new RuntimeException("cannot converted string to long");
    }

    @Override
    public double getDoubleValue(int dictionaryId) {
        throw new RuntimeException("cannot converted string to double");
    }

    @Override
    public String getStringValue(int dictionaryId) {
        return getString(dictionaryId);
    }

    @Override
    public String toString(int dictionaryId) {
        return get(dictionaryId);
    }

    private String getString(int dictionaryId) {
        return dataFileReader.getString(dictionaryId, 0);
    }
}