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/*
* Copyright (C) 2008 Google Inc.
*
* 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.google.gson;
import java.lang.reflect.Field;
import java.util.Locale;
/**
* An enumeration that defines a few standard naming conventions for JSON field names.
* This enumeration should be used in conjunction with {@link com.google.gson.GsonBuilder}
* to configure a {@link com.google.gson.Gson} instance to properly translate Java field
* names into the desired JSON field names.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public enum FieldNamingPolicy implements FieldNamingStrategy {
/**
* Using this naming policy with Gson will ensure that the field name is
* unchanged.
*/
IDENTITY() {
@Override public String translateName(Field f) {
return f.getName();
}
},
/**
* Using this naming policy with Gson will ensure that the first "letter" of the Java
* field name is capitalized when serialized to its JSON form.
*
* Here's a few examples of the form "Java Field Name" ---> "JSON Field Name":
*
* - someFieldName ---> SomeFieldName
* - _someFieldName ---> _SomeFieldName
*
*/
UPPER_CAMEL_CASE() {
@Override public String translateName(Field f) {
return upperCaseFirstLetter(f.getName());
}
},
/**
* Using this naming policy with Gson will ensure that the first "letter" of the Java
* field name is capitalized when serialized to its JSON form and the words will be
* separated by a space.
*
* Here's a few examples of the form "Java Field Name" ---> "JSON Field Name":
*
* - someFieldName ---> Some Field Name
* - _someFieldName ---> _Some Field Name
*
*
* @since 1.4
*/
UPPER_CAMEL_CASE_WITH_SPACES() {
@Override public String translateName(Field f) {
return upperCaseFirstLetter(separateCamelCase(f.getName(), " "));
}
},
/**
* Using this naming policy with Gson will modify the Java Field name from its camel cased
* form to a lower case field name where each word is separated by an underscore (_).
*
* Here's a few examples of the form "Java Field Name" ---> "JSON Field Name":
*
* - someFieldName ---> some_field_name
* - _someFieldName ---> _some_field_name
* - aStringField ---> a_string_field
* - aURL ---> a_u_r_l
*
*/
LOWER_CASE_WITH_UNDERSCORES() {
@Override public String translateName(Field f) {
return separateCamelCase(f.getName(), "_").toLowerCase(Locale.ENGLISH);
}
},
/**
* Using this naming policy with Gson will modify the Java Field name from its camel cased
* form to a lower case field name where each word is separated by a dash (-).
*
* Here's a few examples of the form "Java Field Name" ---> "JSON Field Name":
*
* - someFieldName ---> some-field-name
* - _someFieldName ---> _some-field-name
* - aStringField ---> a-string-field
* - aURL ---> a-u-r-l
*
* Using dashes in JavaScript is not recommended since dash is also used for a minus sign in
* expressions. This requires that a field named with dashes is always accessed as a quoted
* property like {@code myobject['my-field']}. Accessing it as an object field
* {@code myobject.my-field} will result in an unintended javascript expression.
* @since 1.4
*/
LOWER_CASE_WITH_DASHES() {
@Override public String translateName(Field f) {
return separateCamelCase(f.getName(), "-").toLowerCase(Locale.ENGLISH);
}
},
/**
* Using this naming policy with Gson will modify the Java Field name from its camel cased
* form to a lower case field name where each word is separated by a dot (.).
*
* Here's a few examples of the form "Java Field Name" ---> "JSON Field Name":
*
* - someFieldName ---> some.field.name
* - _someFieldName ---> _some.field.name
* - aStringField ---> a.string.field
* - aURL ---> a.u.r.l
*
* Using dots in JavaScript is not recommended since dot is also used for a member sign in
* expressions. This requires that a field named with dots is always accessed as a quoted
* property like {@code myobject['my.field']}. Accessing it as an object field
* {@code myobject.my.field} will result in an unintended javascript expression.
* @since 2.8
*/
LOWER_CASE_WITH_DOTS() {
@Override public String translateName(Field f) {
return separateCamelCase(f.getName(), ".").toLowerCase(Locale.ENGLISH);
}
};
/**
* Converts the field name that uses camel-case define word separation into
* separate words that are separated by the provided {@code separatorString}.
*/
static String separateCamelCase(String name, String separator) {
StringBuilder translation = new StringBuilder();
for (int i = 0, length = name.length(); i < length; i++) {
char character = name.charAt(i);
if (Character.isUpperCase(character) && translation.length() != 0) {
translation.append(separator);
}
translation.append(character);
}
return translation.toString();
}
/**
* Ensures the JSON field names begins with an upper case letter.
*/
static String upperCaseFirstLetter(String name) {
int firstLetterIndex = 0;
int limit = name.length() - 1;
for(; !Character.isLetter(name.charAt(firstLetterIndex)) && firstLetterIndex < limit; ++firstLetterIndex);
char firstLetter = name.charAt(firstLetterIndex);
if(Character.isUpperCase(firstLetter)) { //The letter is already uppercased, return the original
return name;
}
char uppercased = Character.toUpperCase(firstLetter);
if(firstLetterIndex == 0) { //First character in the string is the first letter, saves 1 substring
return uppercased + name.substring(1);
}
return name.substring(0, firstLetterIndex) + uppercased + name.substring(firstLetterIndex + 1);
}
}