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>
33 * @author srowen@google.com (Sean Owen)
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 = EmailAddressResultParser.parse(theResult)) != null) {
50 } else if ((result = AddressBookAUResultParser.parse(theResult)) != null) {
52 } else if ((result = VCardResultParser.parse(theResult)) != null) {
54 } else if ((result = BizcardResultParser.parse(theResult)) != null) {
56 } else if ((result = VEventResultParser.parse(theResult)) != null) {
58 } else if ((result = TelResultParser.parse(theResult)) != null) {
60 } else if ((result = SMSMMSResultParser.parse(theResult)) != null) {
62 } else if ((result = GeoResultParser.parse(theResult)) != null) {
64 } else if ((result = URLTOResultParser.parse(theResult)) != null) {
66 } else if ((result = URIResultParser.parse(theResult)) != null) {
68 } else if ((result = UPCResultParser.parse(theResult)) != null) {
71 return new TextParsedResult(theResult.getText(), null);
74 protected static void maybeAppend(String value, StringBuffer result) {
81 protected static void maybeAppend(String[] value, StringBuffer result) {
83 for (int i = 0; i < value.length; i++) {
85 result.append(value[i]);
90 protected static String unescapeBackslash(String escaped) {
91 if (escaped != null) {
92 int backslash = escaped.indexOf((int) '\\');
94 int max = escaped.length();
95 StringBuffer unescaped = new StringBuffer(max - 1);
96 unescaped.append(escaped.toCharArray(), 0, backslash);
97 boolean nextIsEscaped = false;
98 for (int i = backslash; i < max; i++) {
99 char c = escaped.charAt(i);
100 if (nextIsEscaped || c != '\\') {
102 nextIsEscaped = false;
104 nextIsEscaped = true;
107 return unescaped.toString();
113 static String urlDecode(String escaped) {
115 // No we can't use java.net.URLDecoder here. JavaME doesn't have it.
116 if (escaped == null) {
119 char[] escapedArray = escaped.toCharArray();
121 int first = findFirstEscape(escapedArray);
126 int max = escapedArray.length;
127 // final length is at most 2 less than original due to at least 1 unescaping
128 StringBuffer unescaped = new StringBuffer(max - 2);
129 // Can append everything up to first escape character
130 unescaped.append(escapedArray, 0, first);
132 for (int i = first; i < max; i++) {
133 char c = escapedArray[i];
135 // + is translated directly into a space
136 unescaped.append(' ');
137 } else if (c == '%') {
138 // Are there even two more chars? if not we will just copy the escaped sequence and be done
140 unescaped.append('%'); // append that % and move on
142 int firstDigitValue = parseHexDigit(escapedArray[++i]);
143 int secondDigitValue = parseHexDigit(escapedArray[++i]);
144 if (firstDigitValue < 0 || secondDigitValue < 0) {
145 // bad digit, just move on
146 unescaped.append('%');
147 unescaped.append(escapedArray[i-1]);
148 unescaped.append(escapedArray[i]);
150 unescaped.append((char) ((firstDigitValue << 4) + secondDigitValue));
156 return unescaped.toString();
159 private static int findFirstEscape(char[] escapedArray) {
160 int max = escapedArray.length;
161 for (int i = 0; i < max; i++) {
162 char c = escapedArray[i];
163 if (c == '+' || c == '%') {
170 private static int parseHexDigit(char c) {
173 return 10 + (c - 'a');
175 } else if (c >= 'A') {
177 return 10 + (c - 'A');
179 } else if (c >= '0') {
187 protected static boolean isStringOfDigits(String value, int length) {
191 int stringLength = value.length();
192 if (length != stringLength) {
195 for (int i = 0; i < length; i++) {
196 char c = value.charAt(i);
197 if (c < '0' || c > '9') {
204 static Hashtable parseNameValuePairs(String uri) {
205 int paramStart = uri.indexOf('?');
206 if (paramStart < 0) {
209 Hashtable result = new Hashtable(3);
212 while ((paramEnd = uri.indexOf('&', paramStart)) >= 0) {
213 appendKeyValue(uri, paramStart, paramEnd, result);
214 paramStart = paramEnd + 1;
216 appendKeyValue(uri, paramStart, uri.length(), result);
220 private static void appendKeyValue(String uri, int paramStart, int paramEnd, Hashtable result) {
221 int separator = uri.indexOf('=', paramStart);
222 if (separator >= 0) {
224 String key = uri.substring(paramStart, separator);
225 String value = uri.substring(separator + 1, paramEnd);
226 value = urlDecode(value);
227 result.put(key, value);
230 String key = uri.substring(paramStart, paramEnd);
231 result.put(key, null);
235 static String[] matchPrefixedField(String prefix, String rawText, char endChar) {
236 Vector matches = null;
238 int max = rawText.length();
240 i = rawText.indexOf(prefix, i);
244 i += prefix.length(); // Skip past this prefix we found to start
245 int start = i; // Found the start of a match here
246 boolean done = false;
248 i = rawText.indexOf((int) endChar, i);
250 // No terminating end character? uh, done. Set i such that loop terminates and break
251 i = rawText.length();
253 } else if (rawText.charAt(i - 1) == '\\') {
254 // semicolon was escaped so continue
258 if (matches == null) {
259 matches = new Vector(3); // lazy init
261 matches.addElement(unescapeBackslash(rawText.substring(start, i)));
267 if (matches == null || matches.isEmpty()) {
270 return toStringArray(matches);
273 static String matchSinglePrefixedField(String prefix, String rawText, char endChar) {
274 String[] matches = matchPrefixedField(prefix, rawText, endChar);
275 return matches == null ? null : matches[0];
278 static String[] toStringArray(Vector strings) {
279 int size = strings.size();
280 String[] result = new String[size];
281 for (int j = 0; j < size; j++) {
282 result[j] = (String) strings.elementAt(j);