alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (UnicodeEscaper.java)

This example Java source code file (UnicodeEscaper.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

codepointtranslator, ioexception, override, string, unicodeescaper, writer

The UnicodeEscaper.java Java example source code

/*
 * 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.lang3.text.translate;

import java.io.IOException;
import java.io.Writer;

/**
 * Translates codepoints to their Unicode escaped value.
 *
 * @since 3.0
 */
public class UnicodeEscaper extends CodePointTranslator {

    private final int below;
    private final int above;
    private final boolean between;

    /**
     * <p>Constructs a UnicodeEscaper for all characters. 

*/ public UnicodeEscaper(){ this(0, Integer.MAX_VALUE, true); } /** * <p>Constructs a UnicodeEscaper for the specified range. This is * the underlying method for the other constructors/builders. The <code>below * and <code>above boundaries are inclusive when between is * <code>true and exclusive when it is false.

* * @param below int value representing the lowest codepoint boundary * @param above int value representing the highest codepoint boundary * @param between whether to escape between the boundaries or outside them */ protected UnicodeEscaper(final int below, final int above, final boolean between) { this.below = below; this.above = above; this.between = between; } /** * <p>Constructs a UnicodeEscaper below the specified value (exclusive).

* * @param codepoint below which to escape * @return the newly created {@code UnicodeEscaper} instance */ public static UnicodeEscaper below(final int codepoint) { return outsideOf(codepoint, Integer.MAX_VALUE); } /** * <p>Constructs a UnicodeEscaper above the specified value (exclusive).

* * @param codepoint above which to escape * @return the newly created {@code UnicodeEscaper} instance */ public static UnicodeEscaper above(final int codepoint) { return outsideOf(0, codepoint); } /** * <p>Constructs a UnicodeEscaper outside of the specified values (exclusive).

* * @param codepointLow below which to escape * @param codepointHigh above which to escape * @return the newly created {@code UnicodeEscaper} instance */ public static UnicodeEscaper outsideOf(final int codepointLow, final int codepointHigh) { return new UnicodeEscaper(codepointLow, codepointHigh, false); } /** * <p>Constructs a UnicodeEscaper between the specified values (inclusive).

* * @param codepointLow above which to escape * @param codepointHigh below which to escape * @return the newly created {@code UnicodeEscaper} instance */ public static UnicodeEscaper between(final int codepointLow, final int codepointHigh) { return new UnicodeEscaper(codepointLow, codepointHigh, true); } /** * {@inheritDoc} */ @Override public boolean translate(final int codepoint, final Writer out) throws IOException { if (between) { if (codepoint < below || codepoint > above) { return false; } } else { if (codepoint >= below && codepoint <= above) { return false; } } // TODO: Handle potential + sign per various Unicode escape implementations if (codepoint > 0xffff) { out.write(toUtf16Escape(codepoint)); } else { out.write("\\u"); out.write(HEX_DIGITS[(codepoint >> 12) & 15]); out.write(HEX_DIGITS[(codepoint >> 8) & 15]); out.write(HEX_DIGITS[(codepoint >> 4) & 15]); out.write(HEX_DIGITS[(codepoint) & 15]); } return true; } /** * Converts the given codepoint to a hex string of the form {@code "\\uXXXX"} * * @param codepoint * a Unicode code point * @return the hex string for the given codepoint * * @since 3.2 */ protected String toUtf16Escape(final int codepoint) { return "\\u" + hex(codepoint); } }

Other Java examples (source code examples)

Here is a short list of links related to this Java UnicodeEscaper.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.