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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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 com.android.providers.contacts;
import android.net.Uri;
import android.text.TextUtils;
import java.util.ArrayList;
/**
* Contacts lookup key. Used for generation and parsing of contact lookup keys as well
* as doing the actual lookup.
*/
public class ContactLookupKey {
public static class LookupKeySegment implements Comparable<LookupKeySegment> {
public int accountHashCode;
public boolean sourceIdLookup;
public String key;
public long contactId;
public int compareTo(LookupKeySegment another) {
if (contactId > another.contactId) {
return -1;
}
if (contactId < another.contactId) {
return 1;
}
return 0;
}
}
/**
* Returns a short hash code that functions as an additional precaution against the exceedingly
* improbable collision between sync IDs in different accounts.
*/
public static int getAccountHashCode(String accountType, String accountName) {
if (accountType == null || accountName == null) {
return 0;
}
return (accountType.hashCode() ^ accountName.hashCode()) & 0xFFF;
}
public static void appendToLookupKey(StringBuilder lookupKey, String accountType,
String accountName, String sourceId, String displayName) {
if (TextUtils.isEmpty(sourceId) && TextUtils.isEmpty(displayName)) {
return;
}
if (lookupKey.length() != 0) {
lookupKey.append(".");
}
lookupKey.append(getAccountHashCode(accountType, accountName));
if (sourceId == null) {
lookupKey.append('n').append(NameNormalizer.normalize(displayName));
} else {
int pos = lookupKey.length();
lookupKey.append('i');
if (appendEscapedSourceId(lookupKey, sourceId)) {
lookupKey.setCharAt(pos, 'e');
}
}
}
private static boolean appendEscapedSourceId(StringBuilder sb, String sourceId) {
boolean escaped = false;
int start = 0;
while (true) {
int index = sourceId.indexOf('.', start);
if (index == -1) {
sb.append(sourceId, start, sourceId.length());
break;
}
escaped = true;
sb.append(sourceId, start, index);
sb.append("..");
start = index + 1;
}
return escaped;
}
public ArrayList<LookupKeySegment> parse(String lookupKey) {
ArrayList<LookupKeySegment> list = new ArrayList<LookupKeySegment>();
String string = Uri.decode(lookupKey);
int offset = 0;
int length = string.length();
int hashCode = 0;
boolean sourceIdLookup = false;
boolean escaped;
String key;
while (offset < length) {
char c = 0;
// Parse account hash code
hashCode = 0;
while (offset < length) {
c = string.charAt(offset++);
if (c < '0' || c > '9') {
break;
}
hashCode = hashCode * 10 + (c - '0');
}
// Parse segment type
if (c == 'n') {
sourceIdLookup = false;
escaped = false;
} else if (c == 'i') {
sourceIdLookup = true;
escaped = false;
} else if (c == 'e') {
sourceIdLookup = true;
escaped = true;
} else {
throw new IllegalArgumentException("Invalid lookup id: " + lookupKey);
}
// Parse the source ID or normalized display name
if (escaped) {
StringBuffer sb = new StringBuffer();
while (offset < length) {
c = string.charAt(offset++);
if (c == '.') {
if (offset == length) {
throw new IllegalArgumentException("Invalid lookup id: " + lookupKey);
}
c = string.charAt(offset);
if (c == '.') {
sb.append('.');
offset++;
} else {
break;
}
} else {
sb.append(c);
}
}
key = sb.toString();
} else {
int start = offset;
while (offset < length) {
c = string.charAt(offset++);
if (c == '.') {
break;
}
}
if (offset == length) {
key = string.substring(start);
} else {
key = string.substring(start, offset - 1);
}
}
LookupKeySegment segment = new LookupKeySegment();
segment.accountHashCode = hashCode;
segment.key = key;
segment.sourceIdLookup = sourceIdLookup;
segment.contactId = -1;
list.add(segment);
}
return list;
}
}
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