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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.commons.text.translate;

import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;

import org.apache.commons.lang3.ArrayUtils;

/**
 * Translates XML numeric entities of the form &#[xX]?\d+;? to
 * the specific code point.
 *
 * Note that the semicolon is optional.
 *
 * @since 1.0
 */
public class NumericEntityUnescaper extends CharSequenceTranslator {

    /** Enumerates NumericEntityUnescaper options for unescaping. */
    public enum OPTION {

        /**
         * Requires a semicolon.
         */
        semiColonRequired,

        /**
         * Does not require a semicolon.
         */
        semiColonOptional,

        /**
         * Throws an exception if a semicolon is missing.
         */
        errorIfNoSemiColon
    }

    /** Default options. */
    private static final EnumSet




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