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/*
* Copyright (C) 2015 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 android.databinding.tool.util;
import android.databinding.tool.reflection.Callable;
/**
* Central place to convert method/field names to BR observable fields
*/
public class BrNameUtil {
private static String stripPrefixFromField(String name) {
if (name.length() >= 2) {
char firstChar = name.charAt(0);
char secondChar = name.charAt(1);
if (name.length() > 2 && firstChar == 'm' && secondChar == '_') {
char thirdChar = name.charAt(2);
if (Character.isJavaIdentifierStart(thirdChar)) {
return "" + Character.toLowerCase(thirdChar) +
name.subSequence(3, name.length());
}
} else if ((firstChar == 'm' && Character.isUpperCase(secondChar)) ||
(firstChar == '_' && Character.isJavaIdentifierStart(secondChar))) {
return "" + Character.toLowerCase(secondChar) + name.subSequence(2, name.length());
}
}
return name;
}
public static String brKey(Callable callable) {
if (callable.type == Callable.Type.FIELD) {
return stripPrefixFromField(callable.name);
}
CharSequence propertyName;
final String name = callable.name;
if (isGetter(callable) || isSetter(callable)) {
propertyName = name.subSequence(3, name.length());
} else if (isBooleanGetter(callable)) {
propertyName = name.subSequence(2, name.length());
} else {
L.e("@Bindable associated with method must follow JavaBeans convention %s", callable);
return null;
}
char firstChar = propertyName.charAt(0);
return "" + Character.toLowerCase(firstChar) +
propertyName.subSequence(1, propertyName.length());
}
private static boolean isGetter(Callable callable) {
return prefixes(callable.name, "get") &&
Character.isJavaIdentifierStart(callable.name.charAt(3)) &&
callable.getParameterCount() == 0 &&
!callable.resolvedType.isVoid();
}
private static boolean isSetter(Callable callable) {
return prefixes(callable.name, "set") &&
Character.isJavaIdentifierStart(callable.name.charAt(3)) &&
callable.getParameterCount() == 1 &&
callable.resolvedType.isVoid();
}
private static boolean isBooleanGetter(Callable callable) {
return prefixes(callable.name, "is") &&
Character.isJavaIdentifierStart(callable.name.charAt(2)) &&
callable.getParameterCount() == 0 &&
callable.resolvedType.isBoolean();
}
private static boolean prefixes(CharSequence sequence, String prefix) {
boolean prefixes = false;
if (sequence.length() > prefix.length()) {
int count = prefix.length();
prefixes = true;
for (int i = 0; i < count; i++) {
if (sequence.charAt(i) != prefix.charAt(i)) {
prefixes = false;
break;
}
}
}
return prefixes;
}
}
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