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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.vcard;
     17 
     18 import java.util.Set;
     19 
     20 
     21 /**
     22  * <p>
     23  * Basic implementation parsing vCard 4.0.
     24  * </p>
     25  * <p>
     26  * vCard 4.0 is not published yet. Also this implementation is premature.
     27  * </p>
     28  * @hide
     29  */
     30 /* package */ class VCardParserImpl_V40 extends VCardParserImpl_V30 {
     31     // private static final String LOG_TAG = VCardConstants.LOG_TAG;
     32 
     33     public VCardParserImpl_V40() {
     34         super();
     35     }
     36 
     37     public VCardParserImpl_V40(final int vcardType) {
     38         super(vcardType);
     39     }
     40 
     41     @Override
     42     protected int getVersion() {
     43         return VCardConfig.VERSION_40;
     44     }
     45 
     46     @Override
     47     protected String getVersionString() {
     48         return VCardConstants.VERSION_V40;
     49     }
     50 
     51     /**
     52      * We escape "\N" into new line for safety.
     53      */
     54     @Override
     55     protected String maybeUnescapeText(final String text) {
     56         return unescapeText(text);
     57     }
     58 
     59     public static String unescapeText(final String text) {
     60         // TODO: more strictly, vCard 4.0 requires different type of unescaping rule
     61         //       toward each property.
     62         final StringBuilder builder = new StringBuilder();
     63         final int length = text.length();
     64         for (int i = 0; i < length; i++) {
     65             char ch = text.charAt(i);
     66             if (ch == '\\' && i < length - 1) {
     67                 final char next_ch = text.charAt(++i);
     68                 if (next_ch == 'n' || next_ch == 'N') {
     69                     builder.append("\n");
     70                 } else {
     71                     builder.append(next_ch);
     72                 }
     73             } else {
     74                 builder.append(ch);
     75             }
     76         }
     77         return builder.toString();
     78     }
     79 
     80     public static String unescapeCharacter(final char ch) {
     81         if (ch == 'n' || ch == 'N') {
     82             return "\n";
     83         } else {
     84             return String.valueOf(ch);
     85         }
     86     }
     87 
     88     @Override
     89     protected Set<String> getKnownPropertyNameSet() {
     90         return VCardParser_V40.sKnownPropertyNameSet;
     91     }
     92 }