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NanoXLSX4j is a small Java library to create and read XLSX files (Microsoft Excel 2007 or newer) in an easy and native way. The library is originated form PicoXLSX4j and has basic support of reading spreadsheets

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/*
 * NanoXLSX4j is a small Java library to write and read XLSX (Microsoft Excel 2007 or newer) files in an easy and native way
 * Copyright Raphael Stoeckli © 2024
 * This library is licensed under the MIT License.
 * You find a copy of the license in project folder or on: http://opensource.org/licenses/MIT
 */
package ch.rabanti.nanoxlsx4j.lowLevel;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * Class representing a reduced sorted map (key / value). This class is not compatible with the Map interface
 *
 * @author Raphael Stoeckli
 */
class SortedMap {

    // ### P R I V A T E F I E L D S ###
    private int count;
    private final HashMap index;
    private final List keyEntries;
    private final List valueEntries;

    // ### C O N S T R U C T O R S ###

    /**
     * Default constructor
     */
    public SortedMap() {
        this.keyEntries = new ArrayList<>();
        this.valueEntries = new ArrayList<>();
        this.index = new HashMap<>();
        this.count = 0;
    }

    // ### M E T H O D S ###

    /**
     * Method to add a key value pair
     *
     * @param key   key as string
     * @param value value as string
     * @return returns the resolved string (either added or returned from an existing entry)
     */
    public String add(String key, String value) {
        if (index.containsKey(key)) {
            return valueEntries.get(index.get(key));
        }
        index.put(key, count);
        count++;
        keyEntries.add(key);
        valueEntries.add(value);
        return value;
    }

    /**
     * Gets the keys of the map as list
     *
     * @return ArrayList of Keys
     */
    public List getKeys() {
        return this.keyEntries;
    }

    /**
     * Gets the size of the map
     *
     * @return Number of entries in the map
     */
    public int size() {
        return this.count;
    }

}