Here you can find the source of escape(String str)
Escapes any values it finds into their String form.
So a tab becomes the characters '\\' and 't'.
| Parameter | Description |
|---|---|
| str | String to escape values in |
| Parameter | Description |
|---|---|
| NullPointerException | if str is <code>null</code> |
public static String escape(String str)
//package com.java2s; /* ==================================================================== * The Apache Software License, Version 1.1 * * Copyright (c) 2002 The Apache Software Foundation. All rights * reserved./*from w w w .j av a 2 s . c o m*/ * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "This product includes software developed by the * Apache Software Foundation (http://www.codehaus.org/)." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Jakarta Project", "Commons", and "Apache Software * Foundation" must not be used to endorse or promote products derived * from this software without prior written permission. For written * permission, please contact codehaus@codehaus.org. * * 5. Products derived from this software may not be called "Apache" * nor may "Apache" appear in their names without prior written * permission of the Apache Software Foundation. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.codehaus.org/>. */ import java.util.Arrays; public class Main { /** * <p>Escapes any values it finds into their String form.</p> * * <p>So a tab becomes the characters <code>'\\'</code> and * <code>'t'</code>.</p> * * @param str String to escape values in * @return String with escaped values * @throws NullPointerException if str is <code>null</code> */ public static String escape(String str) { // improved with code from cybertiger@cyberiantiger.org // unicode from him, and defaul for < 32's. int sz = str.length(); StringBuilder buffer = new StringBuilder(2 * sz); for (int i = 0; i < sz; i++) { char ch = str.charAt(i); // handle unicode if (ch > 0xfff) { buffer.append("\\u" + Integer.toHexString(ch)); } else if (ch > 0xff) { buffer.append("\\u0" + Integer.toHexString(ch)); } else if (ch > 0x7f) { buffer.append("\\u00" + Integer.toHexString(ch)); } else if (ch < 32) { switch (ch) { case '\b': buffer.append('\\'); buffer.append('b'); break; case '\n': buffer.append('\\'); buffer.append('n'); break; case '\t': buffer.append('\\'); buffer.append('t'); break; case '\f': buffer.append('\\'); buffer.append('f'); break; case '\r': buffer.append('\\'); buffer.append('r'); break; default: if (ch > 0xf) { buffer.append("\\u00" + Integer.toHexString(ch)); } else { buffer.append("\\u000" + Integer.toHexString(ch)); } break; } } else { switch (ch) { case '\'': buffer.append('\\'); buffer.append('\''); break; case '"': buffer.append('\\'); buffer.append('"'); break; case '\\': buffer.append('\\'); buffer.append('\\'); break; default: buffer.append(ch); break; } } } return buffer.toString(); } /** * @param source * @param escapedChars * @param escapeChar * @return the String escaped * @since 1.5.1 */ public static String escape(String source, final char[] escapedChars, char escapeChar) { return escape(source, escapedChars, escapeChar + "%s"); } /** * @param source * @param escapedChars * @param escapePattern * @return the String escaped * @since 3.0.4 */ public static String escape(String source, final char[] escapedChars, String escapePattern) { if (source == null) { return null; } char[] eqc = new char[escapedChars.length]; System.arraycopy(escapedChars, 0, eqc, 0, escapedChars.length); Arrays.sort(eqc); StringBuilder buffer = new StringBuilder(source.length()); for (int i = 0; i < source.length(); i++) { final char c = source.charAt(i); int result = Arrays.binarySearch(eqc, c); if (result > -1) { buffer.append(String.format(escapePattern, c)); } else { buffer.append(c); } } return buffer.toString(); } }