import org.dbflute.optional.OptionalEntity;

/**
 * Character mapping file handler for managing character mapping dictionaries.
 * This class provides functionality to load, parse, and manage character mapping
 * rules that define how input characters should be transformed to output characters
 * during text analysis and search processing.
 *
 * Character mapping files contain mapping rules in the format:
 * input1,input2,... => output

			</plugin>
			<plugin>
				<artifactId>maven-javadoc-plugin</artifactId>
				<version>3.11.2</version>
				<configuration>
					<encoding>UTF-8</encoding>
					<docencoding>UTF-8</docencoding>
					<charset>UTF-8</charset>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-jar-plugin</artifactId>
				<version>3.4.2</version>
				<configuration>
					<archive>
						<manifestEntries>

			</plugin>
			<plugin>
				<artifactId>maven-javadoc-plugin</artifactId>
				<version>3.11.2</version>
				<configuration>
					<encoding>UTF-8</encoding>
					<docencoding>UTF-8</docencoding>
					<charset>UTF-8</charset>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-jar-plugin</artifactId>
				<version>3.4.2</version>
				<configuration>
					<archive>
						<manifestEntries>

			</plugin>
			<plugin>
				<artifactId>maven-javadoc-plugin</artifactId>
				<configuration>
					<encoding>UTF-8</encoding>
					<docencoding>UTF-8</docencoding>
					<charset>UTF-8</charset>
					<locale>en_US</locale>
					<windowtitle>Open Source Enterprise Search: Fess API</windowtitle>
					<header>&lt;a href="https://fess.codelibs.org/" target="_blank"&gt;Enterprise Search Server: Fess&lt;/a&gt;</header>

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.helper;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;