001/**
002 * Copyright 2004-2014 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.student.contract.writer;
017
018/**
019 *
020 * @author nwright
021 */
022public class StringQuoter {
023
024    public static String quote(String value) {
025        if (value == null) {
026            return null;
027        }
028        StringBuffer buf = new StringBuffer(value.length() + 3);
029        buf.append('"');
030        boolean lastCharWasEscape = false;
031        for (int i = 0; i < value.length(); i++) {
032            char c = value.charAt(i);
033            switch (c) {
034                case '"':
035                    if (!lastCharWasEscape) {
036                        buf.append('\\');
037                    }
038                    lastCharWasEscape = false;
039                    break;
040                case '\\':
041                    if (!lastCharWasEscape) {
042                        buf.append('\\');
043                    }
044                    lastCharWasEscape = true;
045                    break;
046                case '\n':
047                case '\r':
048                    buf.append('"');
049                    buf.append("\n");
050                    buf.append("\t + ");
051                    buf.append('"');
052                    lastCharWasEscape = false;
053                    continue;
054                default:
055                    lastCharWasEscape = false;
056            }
057            buf.append(c);
058        }
059        buf.append('"');
060        return buf.toString();
061    }
062}