    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.text.translate;
    018
    019import java.io.IOException;
    020import java.io.Writer;
    021
    022import org.apache.commons.lang3.Range;
    023
    024/**
    025 * Translates code points to their XML numeric entity escaped value.
    026 *
    027 * @since 1.0
    028 */
    029public class NumericEntityEscaper extends CodePointTranslator {
    030
    031    /**
    032     * Constructs a {@code NumericEntityEscaper} above the specified value (exclusive).
    033     *
    034     * @param codePoint above which to escape
    035     * @return The newly created {@code NumericEntityEscaper} instance
    036     */
    037    public static NumericEntityEscaper above(final int codePoint) {
    038        return outsideOf(0, codePoint);
    039    }
    040
    041    /**
    042     * Constructs a {@code NumericEntityEscaper} below the specified value (exclusive).
    043     *
    044     * @param codePoint below which to escape
    045     * @return The newly created {@code NumericEntityEscaper} instance
    046     */
    047    public static NumericEntityEscaper below(final int codePoint) {
    048        return outsideOf(codePoint, Integer.MAX_VALUE);
    049    }
    050
    051    /**
    052     * Constructs a {@code NumericEntityEscaper} between the specified values (inclusive).
    053     *
    054     * @param codePointLow above which to escape
    055     * @param codePointHigh below which to escape
    056     * @return The newly created {@code NumericEntityEscaper} instance
    057     */
    058    public static NumericEntityEscaper between(final int codePointLow, final int codePointHigh) {
    059        return new NumericEntityEscaper(codePointLow, codePointHigh, true);
    060    }
    061
    062    /**
    063     * Constructs a {@code NumericEntityEscaper} outside of the specified values (exclusive).
    064     *
    065     * @param codePointLow below which to escape
    066     * @param codePointHigh above which to escape
    067     * @return The newly created {@code NumericEntityEscaper} instance
    068     */
    069    public static NumericEntityEscaper outsideOf(final int codePointLow, final int codePointHigh) {
    070        return new NumericEntityEscaper(codePointLow, codePointHigh, false);
    071    }
    072
    073    /** whether to escape between the boundaries or outside them. */
    074    private final boolean between;
    075
    076    /** range from lowest code point to highest code point. */
    077    private final Range<Integer> range;
    078
    079    /**
    080     * Constructs a {@code NumericEntityEscaper} for all characters.
    081     */
    082    public NumericEntityEscaper() {
    083        this(0, Integer.MAX_VALUE, true);
    084    }
    085
    086    /**
    087     * Constructs a {@code NumericEntityEscaper} for the specified range. This is
    088     * the underlying method for the other constructors/builders. The {@code below}
    089     * and {@code above} boundaries are inclusive when {@code between} is
    090     * {@code true} and exclusive when it is {@code false}.
    091     *
    092     * @param below int value representing the lowest code point boundary
    093     * @param above int value representing the highest code point boundary
    094     * @param between whether to escape between the boundaries or outside them
    095     */
    096    private NumericEntityEscaper(final int below, final int above, final boolean between) {
    097        this.range = Range.of(below, above);
    098        this.between = between;
    099    }
    100
    101    /**
    102     * {@inheritDoc}
    103     */
    104    @Override
    105    public boolean translate(final int codePoint, final Writer writer) throws IOException {
    106        if (this.between != this.range.contains(codePoint)) {
    107            return false;
    108        }
    109        writer.write("&#");
    110        writer.write(Integer.toString(codePoint, 10));
    111        writer.write(';');
    112        return true;
    113    }
    114}