2 * Copyright 2007 ZXing authors
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package com.google.zxing.client.result;
19 import com.google.zxing.Result;
21 import java.util.Hashtable;
22 import java.util.Vector;
25 * <p>Abstract class representing the result of decoding a barcode, as more than
26 * a String -- as some type of structured data. This might be a subclass which represents
27 * a URL, or an e-mail address. {@link #parseResult(com.google.zxing.Result)} will turn a raw
28 * decoded string into the most appropriate type of structured representation.</p>
30 * <p>Thanks to Jeff Griffin for proposing rewrite of these classes that relies less
31 * on exception-based mechanisms during parsing.</p>
35 public abstract class ResultParser {
37 public static ParsedResult parseResult(Result theResult) {
38 // This is a bit messy, but given limited options in MIDP / CLDC, this may well be the simplest
39 // way to go about this. For example, we have no reflection available, really.
40 // Order is important here.
42 if ((result = BookmarkDoCoMoResultParser.parse(theResult)) != null) {
44 } else if ((result = AddressBookDoCoMoResultParser.parse(theResult)) != null) {
46 } else if ((result = EmailDoCoMoResultParser.parse(theResult)) != null) {
48 } else if ((result = AddressBookAUResultParser.parse(theResult)) != null) {
50 } else if ((result = VCardResultParser.parse(theResult)) != null) {
52 } else if ((result = BizcardResultParser.parse(theResult)) != null) {
54 } else if ((result = VEventResultParser.parse(theResult)) != null) {
56 } else if ((result = EmailAddressResultParser.parse(theResult)) != null) {
58 } else if ((result = TelResultParser.parse(theResult)) != null) {
60 } else if ((result = SMSMMSResultParser.parse(theResult)) != null) {
62 } else if ((result = SMSTOMMSTOResultParser.parse(theResult)) != null) {
64 } else if ((result = GeoResultParser.parse(theResult)) != null) {
66 } else if ((result = URLTOResultParser.parse(theResult)) != null) {
68 } else if ((result = URIResultParser.parse(theResult)) != null) {
70 } else if ((result = ISBNResultParser.parse(theResult)) != null) {
71 // We depend on ISBN parsing coming before UPC, as it is a subset.
73 } else if ((result = ProductResultParser.parse(theResult)) != null) {
75 } else if ((result = ExpandedProductResultParser.parse(theResult)) != null) {
78 return new TextParsedResult(theResult.getText(), null);
81 protected static void maybeAppend(String value, StringBuffer result) {
88 protected static void maybeAppend(String[] value, StringBuffer result) {
90 for (int i = 0; i < value.length; i++) {
92 result.append(value[i]);
97 protected static String[] maybeWrap(String value) {
98 return value == null ? null : new String[] { value };
101 protected static String unescapeBackslash(String escaped) {
102 if (escaped != null) {
103 int backslash = escaped.indexOf((int) '\\');
104 if (backslash >= 0) {
105 int max = escaped.length();
106 StringBuffer unescaped = new StringBuffer(max - 1);
107 unescaped.append(escaped.toCharArray(), 0, backslash);
108 boolean nextIsEscaped = false;
109 for (int i = backslash; i < max; i++) {
110 char c = escaped.charAt(i);
111 if (nextIsEscaped || c != '\\') {
113 nextIsEscaped = false;
115 nextIsEscaped = true;
118 return unescaped.toString();
124 private static String urlDecode(String escaped) {
126 // No we can't use java.net.URLDecoder here. JavaME doesn't have it.
127 if (escaped == null) {
130 char[] escapedArray = escaped.toCharArray();
132 int first = findFirstEscape(escapedArray);
137 int max = escapedArray.length;
138 // final length is at most 2 less than original due to at least 1 unescaping
139 StringBuffer unescaped = new StringBuffer(max - 2);
140 // Can append everything up to first escape character
141 unescaped.append(escapedArray, 0, first);
143 for (int i = first; i < max; i++) {
144 char c = escapedArray[i];
146 // + is translated directly into a space
147 unescaped.append(' ');
148 } else if (c == '%') {
149 // Are there even two more chars? if not we will just copy the escaped sequence and be done
151 unescaped.append('%'); // append that % and move on
153 int firstDigitValue = parseHexDigit(escapedArray[++i]);
154 int secondDigitValue = parseHexDigit(escapedArray[++i]);
155 if (firstDigitValue < 0 || secondDigitValue < 0) {
156 // bad digit, just move on
157 unescaped.append('%');
158 unescaped.append(escapedArray[i-1]);
159 unescaped.append(escapedArray[i]);
161 unescaped.append((char) ((firstDigitValue << 4) + secondDigitValue));
167 return unescaped.toString();
170 private static int findFirstEscape(char[] escapedArray) {
171 int max = escapedArray.length;
172 for (int i = 0; i < max; i++) {
173 char c = escapedArray[i];
174 if (c == '+' || c == '%') {
181 private static int parseHexDigit(char c) {
184 return 10 + (c - 'a');
186 } else if (c >= 'A') {
188 return 10 + (c - 'A');
190 } else if (c >= '0') {
198 protected static boolean isStringOfDigits(String value, int length) {
202 int stringLength = value.length();
203 if (length != stringLength) {
206 for (int i = 0; i < length; i++) {
207 char c = value.charAt(i);
208 if (c < '0' || c > '9') {
215 protected static boolean isSubstringOfDigits(String value, int offset, int length) {
219 int stringLength = value.length();
220 int max = offset + length;
221 if (stringLength < max) {
224 for (int i = offset; i < max; i++) {
225 char c = value.charAt(i);
226 if (c < '0' || c > '9') {
233 static Hashtable parseNameValuePairs(String uri) {
234 int paramStart = uri.indexOf('?');
235 if (paramStart < 0) {
238 Hashtable result = new Hashtable(3);
241 while ((paramEnd = uri.indexOf('&', paramStart)) >= 0) {
242 appendKeyValue(uri, paramStart, paramEnd, result);
243 paramStart = paramEnd + 1;
245 appendKeyValue(uri, paramStart, uri.length(), result);
249 private static void appendKeyValue(String uri, int paramStart, int paramEnd, Hashtable result) {
250 int separator = uri.indexOf('=', paramStart);
251 if (separator >= 0) {
253 String key = uri.substring(paramStart, separator);
254 String value = uri.substring(separator + 1, paramEnd);
255 value = urlDecode(value);
256 result.put(key, value);
258 // Can't put key, null into a hashtable
261 static String[] matchPrefixedField(String prefix, String rawText, char endChar, boolean trim) {
262 Vector matches = null;
264 int max = rawText.length();
266 i = rawText.indexOf(prefix, i);
270 i += prefix.length(); // Skip past this prefix we found to start
271 int start = i; // Found the start of a match here
272 boolean done = false;
274 i = rawText.indexOf((int) endChar, i);
276 // No terminating end character? uh, done. Set i such that loop terminates and break
277 i = rawText.length();
279 } else if (rawText.charAt(i - 1) == '\\') {
280 // semicolon was escaped so continue
284 if (matches == null) {
285 matches = new Vector(3); // lazy init
287 String element = unescapeBackslash(rawText.substring(start, i));
289 element = element.trim();
291 matches.addElement(element);
297 if (matches == null || matches.isEmpty()) {
300 return toStringArray(matches);
303 static String matchSinglePrefixedField(String prefix, String rawText, char endChar, boolean trim) {
304 String[] matches = matchPrefixedField(prefix, rawText, endChar, trim);
305 return matches == null ? null : matches[0];
308 static String[] toStringArray(Vector strings) {
309 int size = strings.size();
310 String[] result = new String[size];
311 for (int j = 0; j < size; j++) {
312 result[j] = (String) strings.elementAt(j);