/guava/android/guava/src/com/google/common/base/CaseFormat.java
checkNotNull( str) ;checkNotNull( format) ;
checkNotNull ( format ) ;
private final String wordSeparator; CaseFormat(CharMatcher wordBoundary, String wordSeparator) { this.wordBoundary = wordBoundary; this.wordSeparator = wordSeparator; } public final String to(CaseFormat format, String str) { <extra_id_0> checkNotNull(str); return (format == this) ? str : convert(format, str); } String convert(CaseFormat format, String s) { StringBuilder out = null; int i = 0;