public Device build(UserAgent userAgent, int confidenceTreshold) {
ArrayList<Device> foundDevices = new ArrayList<Device>();
for (String step1Token : orderedRules.keySet()) {
if (userAgent.getCompleteUserAgent().matches("(?i).*" + step1Token + ".*")) {
Map<String, String> step1Compliant = (Map<String, String>) orderedRules.get(step1Token);
for (String step2token : step1Compliant.keySet()) {
Device d = elaborateTwoStepDeviceWithToken(userAgent, step1Token, step2token);
if (d != null) {
if (d.getConfidence() > confidenceTreshold) {
return d;
} else {
if (d.getConfidence() > 0) {
foundDevices.add(d);
}
}
}
}
}
}
if (foundDevices.size() > 0) {
Collections.sort(foundDevices, Collections.reverseOrder());
return foundDevices.get(0);
}
return null;
}
private Device elaborateTwoStepDeviceWithToken(
UserAgent userAgent, String step1Token, String step2Token) {
int maxLittleTokensDistance = 4;
int maxBigTokensDistance = 8;
int confidence;
String originalToken = step2Token;
String looseToken = step2Token.replaceAll("[ _/-]", ".?");
if (userAgent.getCompleteUserAgent().matches("(?i).*" + step2Token + ".*")) {
confidence = 100;
} else if (userAgent.getCompleteUserAgent().matches("(?i).*" + looseToken + ".*")) {
step2Token = looseToken;
confidence = 90;
} else {
return null;
}
Matcher result =
Pattern.compile(
"(?i)(?:(?:.*"
+ step1Token
+ "(.*?)"
+ step2Token
+ ".*)|(?:.*"
+ step2Token
+ "(.*?)"
+ step1Token
+ ".*))")
.matcher(userAgent.getCompleteUserAgent());
if (result.matches()) {
// test for case sensitive match
Matcher bestResult =
Pattern.compile(
"(?:(?:.*"
+ step1Token
+ "(.*?)"
+ step2Token
+ ".*)|(?:.*"
+ step2Token
+ "(.*?)"
+ step1Token
+ ".*))")
.matcher(userAgent.getCompleteUserAgent());
if (bestResult.matches()) {
result = bestResult;
} else {
confidence -= 20;
}
String betweenTokens = result.group(1);
String s2 = result.group(2);
if (s2 != null && (betweenTokens == null || betweenTokens.length() > s2.length())) {
betweenTokens = s2;
}
int betweenTokensLength = betweenTokens.length();
if (step2Token.length() > 3) {
if (betweenTokensLength > maxBigTokensDistance) {
confidence -= 10;
}
String deviceId = ((Map<String, String>) orderedRules.get(step1Token)).get(originalToken);
if (devices.containsKey(deviceId)) {
Device retDevice = (Device) devices.get(deviceId).clone();
retDevice.setConfidence(confidence);
return retDevice;
}
}
if ((betweenTokensLength < maxLittleTokensDistance)
|| (betweenTokensLength < maxBigTokensDistance
&& (step2Token.length() < 6 || !anyLetter.matcher(step2Token).matches()))) {
if (betweenTokensLength <= 1) {
if (!looseSymbols.matcher(betweenTokens).matches()) {
confidence -= 20;
}
} else {
confidence -= 40;
}
confidence -= (betweenTokensLength * 4);
String deviceId = ((Map<String, String>) orderedRules.get(step1Token)).get(originalToken);
if (devices.containsKey(deviceId)) {
Device retDevice = (Device) devices.get(deviceId).clone();
retDevice.setConfidence(confidence);
return retDevice;
}
}
}
return null;
}