@Override
    public Writer append(final CharSequence value, final int start, final int end) {
        builder.append(value, start, end);
        return this;
    }
Appends a portion of a character sequence to the {@link StringBuilder}.

@param value The character to append
@param start The index of the first character
@param end The index of the last character + 1
@return This writer instance
replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/StringBuilderWriter.java