/*
* Copyright 2007 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ntu.com.google.zxing.client.result;
import ntu.com.google.zxing.Result;
/**
* Tries to parse results that are a URI of some kind.
*
* @author Sean Owen
*/
final class URIResultParser extends ResultParser {
private URIResultParser() {
}
public static URIParsedResult parse(Result result) {
String rawText = result.getText();
// We specifically handle the odd "URL" scheme here for simplicity
if (rawText != null && rawText.startsWith("URL:")) {
rawText = rawText.substring(4);
}
if (rawText != null) {
rawText = rawText.trim();
}
if (!isBasicallyValidURI(rawText)) {
return null;
}
return new URIParsedResult(rawText, null);
}
/**
* Determines whether a string is not obviously not a URI. This implements crude checks; this class does not
* intend to strictly check URIs as its only function is to represent what is in a barcode, but, it does
* need to know when a string is obviously not a URI.
*/
static boolean isBasicallyValidURI(String uri) {
if (uri == null || uri.indexOf(' ') >= 0 || uri.indexOf('\n') >= 0) {
return false;
}
// Look for period in a domain but followed by at least a two-char TLD
// Forget strings that don't have a valid-looking protocol
int period = uri.indexOf('.');
if (period >= uri.length() - 2) {
return false;
}
int colon = uri.indexOf(':');
if (period < 0 && colon < 0) {
return false;
}
if (colon >= 0) {
if (period < 0 || period > colon) {
// colon ends the protocol
for (int i = 0; i < colon; i++) {
char c = uri.charAt(i);
if ((c < 'a' || c > 'z') && (c < 'A' || c > 'Z')) {
return false;
}
}
} else {
// colon starts the port; crudely look for at least two numbers
if (colon >= uri.length() - 2) {
return false;
}
for (int i = colon + 1; i < colon + 3; i++) {
char c = uri.charAt(i);
if (c < '0' || c > '9') {
return false;
}
}
}
}
return true;
}
}