72 lines
2.4 KiB
Java
72 lines
2.4 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Type;
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/**
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* Converts the field name that uses camel-case define word separation into separate words that
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* are separated by the provided {@code separatorString}.
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*
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* <p>The following is an example:</p>
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* <pre>
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* class IntWrapper {
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* public int integerField = 0;
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* }
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*
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* CamelCaseSeparatorNamingPolicy policy = new CamelCaseSeparatorNamingPolicy("_");
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* String translatedFieldName =
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* policy.translateName(IntWrapper.class.getField("integerField"));
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*
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* assert("integer_Field".equals(translatedFieldName));
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* </pre>
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*
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* @author Joel Leitch
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*/
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final class CamelCaseSeparatorNamingPolicy extends RecursiveFieldNamingPolicy {
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private final String separatorString;
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/**
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* Constructs a new CamelCaseSeparatorNamingPolicy object that will add the
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* {@code separatorString} between each of the words separated by camel case.
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*
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* @param separatorString the string value to place between words
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* @throws IllegalArgumentException thrown if the {@code separatorString} parameter
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* is null or purely whitespace.
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*/
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public CamelCaseSeparatorNamingPolicy(String separatorString) {
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Preconditions.checkNotNull(separatorString);
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Preconditions.checkArgument(!"".equals(separatorString.trim()));
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this.separatorString = separatorString;
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}
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@Override
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protected String translateName(String target, Type fieldType, Annotation[] annnotations) {
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StringBuilder translation = new StringBuilder();
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for (int i = 0; i < target.length(); i++) {
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char character = target.charAt(i);
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if (Character.isUpperCase(character) && translation.length() != 0) {
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translation.append(separatorString);
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}
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translation.append(character);
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}
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return translation.toString();
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}
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}
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